Toyota Avalon (XX50): Air Conditioning System(for Gasoline Model)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Gasoline Model)

A/C Switch Indicator does not Turn On

DESCRIPTION

If none of the switch indicators on the air conditioning control panel (radio and display receiver assembly) illuminate, the following factors may be the cause.

Symptom	Factor
A/C switch indicator does not illuminate	Air conditioning amplifier assembly malfunction Air conditioning control panel (radio and display receiver assembly) malfunction A/C switch malfunction A/C switch indicator malfunction (including when indicator turned off without switch operation) Servo motor initialization (incomplete) Mechanical locking of damper and damper link Refrigerant pressure is extremely low Low detected ambient temperature (including thermistor assembly malfunction)

Symptom

Factor

A/C switch indicator does not illuminate

Air conditioning amplifier assembly malfunction
Air conditioning control panel (radio and display receiver assembly) malfunction
A/C switch malfunction
A/C switch indicator malfunction (including when indicator turned off without switch operation)
Servo motor initialization (incomplete)
Mechanical locking of damper and damper link
Refrigerant pressure is extremely low
Low detected ambient temperature (including thermistor assembly malfunction)

PROCEDURE

1.	CHECK MALFUNCTION STATUS

(a) Check the malfunction status of switch indicators on the air conditioning control panel (radio and display receiver assembly).

Result	Proceed to
Indicators are not always illuminated	A
Indicators are not illuminated only immediately after starting the engine	B

GO TO INITIALIZATION

2.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temp Sensor	Thermistor assembly	Min.: -23.30°C (-9.94°F) Max.: 65.95°C (150.71°F)	Actual ambient temperature displayed	Thermistor assembly circuit malfunction When open circuit: -23.30°C (-9.94°F) When short circuit: 65.95°C (150.71°F)

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ambient Temp Sensor

Thermistor assembly

Min.: -23.30°C (-9.94°F)

Max.: 65.95°C (150.71°F)

Actual ambient temperature displayed

Thermistor assembly circuit malfunction

When open circuit: -23.30°C (-9.94°F)
When short circuit: 65.95°C (150.71°F)

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temp Sensor

OK:

The value displayed is 0°C (32°F) or higher.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

GO TO OTHER DIAGNOSIS PROCEDURE (Ambient Temperature Display System)

Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the engine is running, If refrigerant pressure does not decrease when the A/C switch is turned off, the following factors may be the cause.

Symptom	Factor
Cooler compressor assembly does not stop operating Refrigerant pressure does not decrease when A/C switch is turned off	Short to +B in air conditioning amplifier assembly circuit malfunction MG CLT relay malfunction Magnet clutch assembly malfunction Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	INSPECT MG CLT RELAY

(a) Inspect the MG CLT relay.

Click here

REPLACE MG CLT RELAY

2.	CHECK HARNESS AND CONNECTOR (MG CLT RELAY - POWER SOURCE)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (MG CLT relay) - Body ground	Always	11 to 14 V
1 (MG CLT relay) - Body ground	Engine switch off	Below 1 V
1 (MG CLT relay) - Body ground	Engine switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (MG CLT RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (MG CLT relay) - G36-9 (MGC)	Always	Below 1 Ω
2 (MG CLT relay) or G36-9 (MGC) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (MG CLT RELAY - MAGNET CLUTCH ASSEMBLY AND BODY GROUND)

(a) Disconnect the C60 magnet clutch assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (MG CLT relay) - C60-3 (MG+)	Always	Below 1 Ω
5 (MG CLT relay) or C60-3 (MG+) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH ASSEMBLY - BODY GROUND)

(a) Install the MG CLT relay.

(b) Connect the C60 compressor assembly with magnetic clutch connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
C60-3 (MG+) - Body ground	Engine running (A/C switch: Off)	Below 1 V

Tester Connection

Condition

Specified Condition

C60-3 (MG+) - Body ground

Engine running

(A/C switch: Off)

Below 1 V

REPLACE MAGNET CLUTCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Air Vent cannot be Switched

DESCRIPTION

If the air outlet mode does not change even though the air outlet display changes, the following factors may be the cause.

Symptom	Factor
Air outlet mode cannot be changed (air outlet display changes)	No. 1 air conditioning radiator damper servo sub-assembly malfunction Damper link disconnection Air conditioner unit assembly malfunction

Symptom

Factor

Air outlet mode cannot be changed

(air outlet display changes)

No. 1 air conditioning radiator damper servo sub-assembly malfunction
Damper link disconnection
Air conditioner unit assembly malfunction

PROCEDURE

1.	CHECK AIR OUTLET SERVO MOTOR

(a) Confirm for which seat the air outlet mode cannot be changed.

Result	Proceed to
The air outlet mode for the driver seat cannot be changed	A
The air outlet mode for the front passenger seat cannot be changed	A
The air outlet mode for the rear seats cannot be changed	B

GO TO STEP 4

2.	CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

OK:

The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

3.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B1443 is not output	A
B1443 is output	B

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

GO TO DTC B1443

4.	CHECK NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

OK:

The No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

5.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B1449 is not output	A
B1449 is output	B

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

GO TO DTC B1449

Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

DESCRIPTION

If the temperature of the air that blows from the left and right front registers differs, even though the same temperature is set for both sides, the following factors may be the cause.

Symptom

Factor

Temperature of outlet air is cooler on left or right side

(when same temperature set for both sides)

Cooler compressor assembly (compressor solenoid) malfunction
Refrigerant volume (low)
Mechanical locking of damper and damper link
Automatic light control sensor malfunction
Harness or connector

Temperature of outlet air is warmer on left or right side

(when same temperature set for both sides)

Mechanical locking of damper and damper link
Blockage in heater radiator unit sub-assembly
Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If DTC B1244 is output, troubleshoot for DTC B1244 first.
w/ Cornering Light: Click here

w/o Cornering Light: Click here
The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.
Click here

PROCEDURE

1.	CHECK WHEN MALFUNCTION OCCURS

Result	Proceed to
When using cooling function	A
When using heater function	B

GO TO STEP 6

2.	PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item	Condition
A/C switch	On
Ambient temperature*	0 to 49°C (32 to 120°F)
Blower speed	HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

CHARGE SYSTEM WITH REFRIGERANT

3.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 and 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(P)

OK:

Each damper servo motor operates.

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

4.	CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G23 automatic light control sensor connector.

(b) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G23-1 (CLTB) - G33-23 (CLTB)	Always	Below 1 Ω
G23-2 (CLTE) - G33-25 (CLTE)	Always	Below 1 Ω
G23-4 (CLTS) - G33-24 (CLTS)	Always	Below 1 Ω
G23-1 (CLTB) or G33-23 (CLTB) - Other terminals and body ground	Always	10 kΩ or higher
G23-2 (CLTE) or G33-25 (CLTE) - Other terminals and body ground	Always	10 kΩ or higher
G23-4 (CLTS) or G33-24 (CLTS) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT AUTOMATIC LIGHT CONTROL SENSOR

(a) Remove the automatic light control sensor.

Click here

(b) Inspect the automatic light control sensor.

Click here

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

REPLACE AUTOMATIC LIGHT CONTROL SENSOR

6.	BLEED AIR FROM COOLING SYSTEM

(a) Bleed air from cooling system.

Click here

7.	CHECK OPERATION (AIR CONDITIONING SYSTEM)

(a) Set the same temperature for the left and right sides and check that the air that blows from the left and right front registers is the same temperature.

OK:

The air from the left and right front registers is the same temperature.

END (MALFUNCTION DUE TO AIR IN COOLING SYSTEM)

8.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 and 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(P)

OK:

Each damper servo motor operates.

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

Ambient Temperature Display System

DESCRIPTION

The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the automatic air conditioning system. The thermistor assembly detects fluctuations in the ambient temperature and sends it as a signal to the combination meter assembly. This data is used for controlling the cabin temperature. The resistance of the thermistor assembly changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases. The combination meter assembly applies voltage (5 V) to the thermistor assembly and detects voltage changes due to changes in the resistance of the thermistor assembly.

NOTICE:

The thermistor assembly detects the ambient temperature in its vicinity, not the ambient temperature around the vehicle. Depending on factors such as radiant heat from the engine room and the vehicle speed, the ambient temperature detected by the thermistor assembly may differ from the ambient temperature displayed on the multi-information display in the combination meter assembly. For example:

When the vehicle is stopped or being driven at low speeds, the displayed ambient temperature will not be updated to a higher temperature to adjust for and minimize the influence of radiant heat from the engine room on the automatic air conditioning system control. When the vehicle is not being driven at low speeds, the adjustment is performed, but updating of the displayed ambient temperature to a higher temperature is delayed. The displayed ambient temperature will be updated to a lower temperature regardless of the vehicle speed.
When the ambient temperature around the thermistor assembly suddenly changes due to any reason other than radiant heat from the engine room, such as when the vehicle enters or exits a garage or tunnel, the actual ambient temperature of the vehicle and the displayed ambient temperature may differ or changing of the displayed value may be delayed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before performing an inspection, move the vehicle to an area where all of the following conditions are met:
- The ambient temperature changes little.
- The ground temperature is low.
- There are no heat sources, such as a stove, another vehicle with its engine running or an exhaust duct, near.
Perform the following procedure with the engine switch on (IG). Do not start the engine.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTC B1412 is not output	A
DTC B1412 is output	B

GO TO DTC B1412

2.	INSPECT THERMISTOR ASSEMBLY

(a) Remove the thermistor assembly.

Click here

(b) Inspect the thermistor assembly.

Click here

REPLACE THERMISTOR ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A14-2 - G36-13 (TAM)	Always	Below 1 Ω
A14-1 - G36-2 (SG-2)	Always	Below 1 Ω
A14-2 or G36-13 (TAM) - Other terminals and body ground	Always	10 kΩ or higher
A14-1 or G36-2 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK VALUE OF AMBIENT TEMPERATURE DETECTED BY THERMISTOR ASSEMBLY

(a) Disconnect the cable from the negative (-) battery terminal and wait for at least 90 seconds.

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click here

HINT:

The air conditioning amplifier assembly stores the value of the last ambient temperature detected by the thermistor assembly before the engine switch was turned off for up to 1 hour after the engine switch is turned off. It is necessary to clear this value.

(b) Connect the cable to the negative (-) battery terminal.

NOTICE:

Perform the following procedure with the engine switch on (IG).
Wait at least 6 minutes for the values of the thermistor assembly and thermometer to become stable before taking a measurement.
Hold the thermometer 50 mm (1.97 in.) from the thermistor assembly with its sensing portion at the same height and perpendicular to the thermistor assembly.
Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.
When measuring the ambient temperature with a thermometer, do not move the thermometer, touch the sensing portion or allow it to contact the vehicle body.

(d) Make a note of the ambient temperature displayed on the multi-information display in the combination meter assembly.

(e) Compare the value of the ambient temperature measured by the thermometer and the thermistor assembly.

OK:

The value of the ambient temperature measured by the thermometer and the thermistor assembly are almost the same.

END

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Lost Communication with Front Panel LIN (B14B2)

DESCRIPTION

The air conditioning control panel (radio and display receiver assembly) communicates with the air conditioning amplifier assembly via LIN communication.

If a malfunction occurs in the LIN communication system, the air conditioning amplifier assembly will not operate, even if the air conditioning control panel (radio and display receiver assembly) is operated.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B14B2

Lost Communication with Front Panel LIN

Lost communication with air conditioning control assembly

Harness or connector
Air conditioning control panel (radio and display receiver assembly)
Air conditioning amplifier assembly

Memorized

(10 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY) - POWER SOURCE AND BODY GROUND)

(a) Disconnect the G20 air conditioning control panel (radio and display receiver assembly) connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G20-3 (+B) - Body ground	Engine switch off	11 to 14 V
G20-2 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V
G20-10 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
G20-6 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G35 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G20-8 (LIN1) - G35-14 (LIN1)	Always	Below 1 Ω
G20-8 (LIN1) or G35-14 (LIN1) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Connect the G35 air conditioning amplifier assembly connector.

(b) Turn the engine switch on (IG).

Item	Content
Terminal No.	G35-14 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch on (IG)

OK:

Waveform is similar to that shown in the illustration.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

4.	INSPECT AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY)

*a	Component with harness connected (Air Conditioning Control Panel (Radio and Display Receiver Assembly))

(a) Connect the G20 air conditioning control panel (radio and display receiver assembly) connector.

(b) Turn the engine switch on (IG).

Item	Content
Terminal No.	G20-8 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch on (IG)

OK:

Waveform is similar to that shown in the illustration.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONING CONTROL PANEL (RADIO & DISPLAY RECEIVER ASSEMBLY)

Refrigerant Shortage (B14B8)

DESCRIPTION

This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal, etc. from various sensors.

Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant.

If the amount of refrigerant is insufficient, the A/C switch indicator will turn off and the air conditioning system will stop operating.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B14B8

Refrigerant Shortage

The following condition is detected in the normal operation refrigerant shortage check:

Amount of refrigerant is insufficient

Refrigerant line
Cooler expansion valve
Air conditioning amplifier assembly
Harness or connector
Air conditioner pressure sensor

Memorized

(10 min. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

PROCEDURE

1.	CHECK REFRIGERANT PRESSURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (gauge)

Actual refrigerant pressure displayed

Refrigerant line (gas leak etc.)
Air conditioner pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

(f) Install a manifold gauge set.

Click here

(g) Read the manifold gauge set with the following conditions met.

Measurement Condition:

Item	Condition
Vehicle doors	Fully open
Temperature setting	MAX COLD
Blower speed	HI
A/C switch	On
Recirculation/fresh switch	RECIRCULATION
Interior temperature	30 to 35°C (86 to 95°F)

Standard Pressure:

Low pressure side

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

(h) Compare the values displayed in the Data List and on the manifold gauge set.

OK:

The values displayed in the Data List and on the manifold gauge set match.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

*a	Front view of wire harness connector (to Air Conditioner Pressure Sensor)

(a) Disconnect the A15 air conditioner pressure sensor connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A15-3 (+) - Body ground	Engine switch on (IG)	4.75 to 5.25 V

GO TO STEP 7

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - BODY GROUND)

*a	Front view of wire harness connector (to Air Conditioner Pressure Sensor)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-1 (-) - Body ground	Always	Below 1 Ω

GO TO STEP 6

4.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-2 (PR) - G36-24 (PRE)	Always	Below 1 Ω
A15-2 (PR) or G36-24 (PRE) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)

*a	Component with harness connected (Air Conditioning Amplifier Assembly)

(a) Measure the voltage with the following conditions met.

Measurement Condition:

Item	Condition
Vehicle doors	Fully open
Temperature setting	MAX COLD
Blower speed	HI
A/C switch	On
Recirculation/fresh switch	RECIRCULATION
Interior temperature	25 to 35°C (77 to 95°F)

NOTICE:

If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.61 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.
It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

HINT:

When the ambient air temperature is low (below -1.5°C (29.3°F)), the compressor with pulley will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

(1) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G36-24 (PRE) - Body ground

Engine switch on (IG)

(A/C switch: On)

0.74 to 4.61 V

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(f) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (gauge)

Actual refrigerant pressure displayed

Refrigerant line (gas leak etc.)
Air conditioner pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

OK:

The voltage and value displayed in the Data List change.

Result	Proceed to
OK	A
NG (The voltage changes but the value displayed in the Data List does not change.)	A
NG (The voltage does not change.)	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONER PRESSURE SENSOR

6.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-1 (-) - G36-3 (SG-4)	Always	Below 1 Ω
A15-1 (-) or G36-3 (SG-4) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-3 (+) - G36-6 (S5-3)	Always	Below 1 Ω
A15-3 (+) or G36-6 (S5-3) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Refrigerant Overabundance Filling Malfunction (B14BD)

DESCRIPTION

This DTC is stored if the amount of refrigerant in the in the air conditioning system exceeds a threshold. The air conditioning amplifier assembly judges whether the amount of refrigerant is appropriate based on the detected refrigerant pressure and cooler compressor assembly operation current. If the amount of refrigerant in the system is determined to have exceeded a threshold, operation of the cooler compressor assembly will be stopped, and will remain stopped even if the engine switch is turned off and then the engine is restarted.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B14BD

Refrigerant Overabundance Filling Malfunction

All of the following conditions are met 2 times or more in the same trip:

The vehicle speed is 20 km/h or more
The amount of compressor oil is within the insufficient compressor oil range for 60 seconds or more

Refrigerant volume
Air conditioning amplifier assembly

Memorized

(60 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

Electric Current (mA)

Refrigerant Pressure kPa (kgf/cm2, psi)

PROCEDURE

1.	RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM

(a) Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.

Click here

2.	CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT

(a) Charge the air conditioning system with refrigerant.

Click here

END

Room Temperature Sensor Circuit (B1411)

DESCRIPTION

The cooler (room temp. sensor) thermistor is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the cooler (room temp. sensor) thermistor changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the cooler (room temp. sensor) thermistor and reads voltage changes due to changes in the resistance of the cooler (room temp. sensor) thermistor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1411

Room Temperature Sensor Circuit

Open or short in room temperature sensor circuit

Cooler (room temp. sensor) thermistor
Harness or connector
Air conditioning amplifier assembly

Memorized

(4 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

HINT:

If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411 may be stored even though the system is normal.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Room Temperature Sensor

Cooler (room temp. sensor) thermistor

Min.: -6.50°C (20.30°F)

Max.: 57.25°C (135.05°F)

Actual cabin temperature displayed

Cooler (room temp. sensor) thermistor circuit malfunction

When open circuit: -6.50°C (20.30°F)
When short circuit: 57.25°C (135.05°F)

Body Electrical > Air Conditioner > Data List

Tester Display
Room Temperature Sensor

OK:

The display is as specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR

(a) Remove the cooler (room temp. sensor) thermistor.

Click here

(b) Inspect the cooler (room temp. sensor) thermistor.

Click here

REPLACE COOLER (ROOM TEMP. SENSOR) THERMISTOR

3.	CHECK HARNESS AND CONNECTOR (COOLER (ROOM TEMP. SENSOR) THERMISTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G44-1 - G36-14 (TR)	Always	Below 1 Ω
G44-2 - G36-1 (SG-1)	Always	Below 1 Ω
G44-1 or G36-14 (TR) - Other terminals and body ground	Always	10 kΩ or higher
G44-2 or G36-1 (SG-1) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Ambient Temperature Sensor Circuit (B1412)

DESCRIPTION

The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the thermistor assembly changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the thermistor assembly and reads voltage changes due to changes in the resistance of the thermistor assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1412

Ambient Temperature Sensor Circuit

Open or short in ambient temperature sensor circuit

Thermistor assembly
Air conditioning amplifier assembly
Harness or connector

Memorized

(4 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

HINT:

If the ambient temperature is approximately -52.9°C (-63.22°F) or lower, DTC B1412 may be stored even though the system is normal.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ambient Temp Sensor

Thermistor assembly

Min.: -23.30°C (-9.94°F)

Max.: 65.95°C (150.71°F)

Actual ambient temperature displayed

Thermistor assembly circuit malfunction

When open circuit: -23.30°C (-9.94°F)
When short circuit: 65.95°C (150.71°F)

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temp Sensor

OK:

The display is as specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT THERMISTOR ASSEMBLY

(a) Remove the thermistor assembly.

Click here

(b) Inspect the thermistor assembly.

Click here

REPLACE THERMISTOR ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (THERMISTOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A14-2 - G36-13 (TAM)	Always	Below 1 Ω
A14-1 - G36-2 (SG-2)	Always	Below 1 Ω
A14-2 or G36-13 (TAM) - Other terminals and body ground	Always	10 kΩ or higher
A14-1 or G36-2 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Evaporator Temperature Circuit or Evaporator Fin Thermistor (B1413)

DESCRIPTION

The No. 1 cooler thermistor is installed to the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the No. 1 cooler thermistor changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the No. 1 cooler thermistor and reads voltage changes as the resistance of the No. 1 cooler thermistor changes. This sensor is used for frost prevention.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1413

Evaporator Temperature Circuit or Evaporator Fin Thermistor

Open or short in evaporator temperature sensor circuit

No. 1 cooler thermistor
Air conditioning harness assembly
Air conditioning amplifier assembly

Memorized

(4 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG)

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Evaporator Fin Thermistor

No. 1 cooler thermistor

Min.: -29.70°C (-21.46°F)

Max.: 59.55°C (139.19°F)

Actual evaporator temperature displayed

No. 1 cooler thermistor circuit malfunction

When open circuit: -29.70°C (-21.46°F)
When short circuit: 59.55°C (139.19°F)

Body Electrical > Air Conditioner > Data List

Tester Display
Evaporator Fin Thermistor

OK:

The display is as specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT NO. 1 COOLER THERMISTOR

(a) Remove the No. 1 cooler thermistor.

Click here

(b) Inspect the No. 1 cooler thermistor.

Click here

REPLACE NO. 1 COOLER THERMISTOR

3.	INSPECT AIR CONDITIONING HARNESS ASSEMBLY

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

Front view of wire harness connector

(to No. 1 Cooler Thermistor)

(a) Remove the air conditioning harness assembly.

Click here

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z8-5 (SGA) - C-2	Always	Below 1 Ω
z8-6 (TEA) - C-1	Always	Below 1 Ω

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Compressor Lock (B1422)

DESCRIPTION

The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.

The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. If the difference becomes excessively large, the air conditioning amplifier assembly determines that the compressor is locked, and turns the magnet clutch assembly off.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1422

Compressor Lock

Open or short in A/C lock sensor circuit

Magnet clutch assembly
Harness or connector
Air conditioning amplifier assembly

Memorized

(3 seconds or more)

HINT:

The air conditioning amplifier assembly stores the DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The air conditioning system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication system is functioning properly.
Click here
ECM malfunctions can affect the storage of this DTC. Therefore, check all SFI system DTCs and confirm that the system is normal before performing the following inspection.
Click here
After replacing the air conditioning amplifier assembly, make sure to perform Initialization Servo Motor.
Click here

PROCEDURE

1.	INSPECT MAGNET CLUTCH ASSEMBLY

(a) Remove the compressor assembly with magnetic clutch.

Click here

(b) Inspect the magnet clutch assembly.

Click here

REPLACE MAGNET CLUTCH ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C60-1 (SSR+) - G36-21 (LOCK)	Always	Below 1 Ω
C60-2 (SSR-) - G36-2 (SG-2)	Always	Below 1 Ω
C60-1 (SSR+) or G36-21 (LOCK) - Other terminals and body ground	Always	10 kΩ or higher
C60-2 (SSR-) or G36-2 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure (B1423)

DESCRIPTION

This DTC is stored if refrigerant pressure on the high pressure side is extremely low (176 kPa (1.8 kgf/cm2, 26 psi) or less) or extremely high (3025 kPa (30.8 kgf/cm2, 439 psi) or more). The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1423	Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure	Open or short in air conditioner pressure sensor circuit Refrigerant pressure on high pressure side is extremely low (176 kPa (1.8 kgf/cm2, 26 psi) or less) or extremely high (3025 kPa (30.8 kgf/cm2, 439 psi) or more)	Air conditioner pressure sensor Harness or connector Air conditioning amplifier assembly Cooler expansion valve (blocked, stuck) Cooler condenser assembly (blocked, deterioration of cooling capacity due to dirt) Cooler dryer (moisture in the refrigerant cycle cannot be absorbed) Cooling fan system (cooler condenser assembly cannot be cooled down) Air conditioning system (leaks, blocked) Refrigerant volume (excessive, low)	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

If DTC B1423 and B14B8 are output at the same time, troubleshoot for DTC B14B8 first.

Click here

PROCEDURE

1.	PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item	Condition
A/C switch	On
Ambient temperature*	0 to 49°C (32 to 120°F)
Blower speed	HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

GO TO STEP 14

2.	CHECK REFRIGERANT PRESSURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (gauge)

Actual refrigerant pressure displayed

Refrigerant line (gas leak etc.)
Air conditioner pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

(f) Install a manifold gauge set.

Click here

(g) Read the manifold gauge set with the following conditions met.

Measurement Condition:

Item	Condition
Vehicle doors	Fully open
Temperature setting	MAX COLD
Blower speed	HI
A/C switch	On
Recirculation/fresh switch	RECIRCULATION
Interior temperature	25 to 35°C (77 to 95°F)

Standard Pressure:

Low pressure side

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

(h) Compare the values displayed in the Data List and on the manifold gauge set.

OK:

The values displayed in the Data List and on the manifold gauge set match.

GO TO STEP 8

3.	CHECK REFRIGERANT HIGH PRESSURE HISTORY

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Refrigerant High Pressure History

Refrigerant high pressure history

Min.: 0

Max.: 255

Number of times refrigerant high pressure history stored displayed

Body Electrical > Air Conditioner > Data List

Tester Display
Refrigerant High Pressure History

Result	Proceed to
The value is 0	A
The value is not 0	B

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

4.	INSPECT COOLING FAN SYSTEM

(a) Check if the cooling fan operates normally.

Click here

GO TO COOLING FAN SYSTEM

5.	RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM

(a) Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.

Click here

6.	CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT

Click here

7.	PERFORM REFRIGERANT HIGH PRESSURE HISTORY CLEAR

(a) Clear the refrigerant high pressure history stored in the air conditioning amplifier assembly.

Click here

END

8.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

*a	Front view of wire harness connector (to Air Conditioner Pressure Sensor)

(a) Disconnect the A15 air conditioner pressure sensor connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A15-3 (+) - A15-1 (-)	Engine switch on (IG)	4.75 to 5.25 V

GO TO STEP 13

9.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - BODY GROUND)

*a	Front view of wire harness connector (to Air Conditioner Pressure Sensor)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-1 (-) - Body ground	Always	Below 1 Ω

GO TO STEP 12

10.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-2 (PR) - G36-24 (PRE)	Always	Below 1 Ω
A15-2 (PR) or G36-24 (PRE) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	INSPECT AIR CONDITIONER PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)

*a	Component with harness connected (Air Conditioning Amplifier Assembly)

(a) Measure the voltage with the following conditions met.

Measurement Condition:

Item	Condition
Vehicle doors	Fully open
Temperature setting	MAX COLD
Blower speed	HI
A/C switch	On
Recirculation/fresh switch	RECIRCULATION
Interior temperature	25 to 35°C (77 to 95°F)

NOTICE:

If refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the voltage exceeds 4.61 V), a fail-safe function will stop compressor operation. In this case, make sure to measure the voltage before the fail-safe function operates.
It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because the malfunction may recur after a while.

HINT:

When the ambient air temperature is low(below -1.5°C (29.3°F)), the compressor with pulley will be stopped, due to inputs of the thermistor assembly and No. 1 cooler thermistor, to prevent the evaporator from freezing. In this case, perform the inspection in a warm indoor environment.

(1) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G36-24 (PRE) - Body ground

Engine switch on (IG)

(A/C switch: On)

0.74 to 4.61 V

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(f) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (gauge)

Actual refrigerant pressure displayed

Refrigerant line (gas leak etc.)
Air conditioner pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

OK:

The voltage and value displayed in the Data List change.

Result	Proceed to
OK	A
NG (The voltage changes but the value displayed in the Data List does not change.)	A
NG (The voltage does not change.)	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONER PRESSURE SENSOR

12.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-1 (-) - G36-3 (SG-4)	Always	Below 1 Ω
A15-1 (-) or G36-3 (SG-4) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONER PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A15-3 (+) - G36-6 (S5-3)	Always	Below 1 Ω
A15-3 (+) or G36-6 (S5-3) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	REPAIR AIR CONDITIONING SYSTEM LEAK

(a) Identify the area where refrigerant is leaking from.

Click here

(b) Repair the identified area of the air conditioning system.

CHARGE SYSTEM WITH REFRIGERANT

Air Mix Damper Control Servo Motor Circuit (Passenger Side) (B1441,B1443,B1446)

DESCRIPTION

B1441: The No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
B1443: The No. 1 air conditioning radiator damper servo sub-assembly (mode) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air outlet damper to the appropriate position, which controls the air outlet switching. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
B1446: The No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) to the appropriate position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the driver side is controlled. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1441

Air Mix Damper Control Servo Motor Circuit (Passenger Side)

Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix)
Air conditioning harness assembly
Air conditioning amplifier assembly
Air conditioning radiator assembly

Memorized

(30 sec. or more)*

B1443

Air Outlet Damper Control Servo Motor Circuit

Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (mode)

No. 1 air conditioning radiator damper servo sub-assembly (mode)
Air conditioning harness assembly
Air conditioning amplifier assembly
Air conditioning radiator assembly

Memorized

(30 sec. or more)*

B1446

Air Mix Damper Control Servo Motor Circuit (Driver Side)

Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix)
Air conditioning harness assembly
Air conditioning amplifier assembly
Air conditioning radiator assembly

Memorized

(30 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

DTC Detection Condition Combination Table

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	No. 1 air conditioning radiator damper servo sub-assembly operating	○	○
Malfunction	Damper servo operation request signals are output but the damper position sensor value does not change	○	-
Malfunction	Damper servo operation request signals are output but the damper position sensor value is abnormal	-	○
Detection Time		Continuously for 30 seconds or more	Continuously for 30 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Confirm that no mechanical problems are present because this DTC can be stored when either a damper link or damper is mechanically locked.
When installing a damper servo motor, make sure to install it correctly.
Click here
After replacing a damper servo motor, make sure to perform Servo Motor Initialization.
Click here

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
Only B1497 is output	A
B1441, B1442, B1443 and B1446 are output	B
B1441, B1443 or B1446 is output	C

GO TO DTC B1497

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

2.	INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

OK:

The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY

3.	INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.

REMOVE PINCHED WIRE HARNESS

4.	INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.

Click here

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

Air Inlet Damper Control Servo Motor (B1442)

DESCRIPTION

The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air inlet damper to the appropriate position to change the air inlet mode (fresh, recirculation/fresh, and recirculation).

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1442

Air Inlet Damper Control Servo Motor

Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly

No. 1 blower damper servo sub-assembly
No. 1 air conditioning radiator damper servo sub-assembly
Air conditioning harness assembly
Air conditioning amplifier assembly
Blower assembly

Memorized

(30 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

DTC Detection Condition Combination Table

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	No. 1 blower damper servo sub-assembly operating	○	○
Malfunction	Air inlet damper servo operation request signals are output but the air inlet damper position sensor value does not change	○	-
Malfunction	Air inlet damper servo operation request signals are output but the air inlet damper position sensor value is abnormal	-	○
Detection Time		Continuously for 30 seconds or more	Continuously for 30 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Confirm that no mechanical problems are present because this DTC can be stored when either a damper link or damper is mechanically locked.
When installing a damper servo motor, make sure to install it correctly.
Click here
After replacing a damper servo motor, make sure to perform Servo Motor Initialization.
Click here

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
Only B1497 is output	A
B1441, B1442, B1443 and B1446 are output	B
Only B1442 is output	C

GO TO DTC B1497

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

2.	INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

The No. 1 blower damper servo sub-assembly is installed correctly.

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

3.	INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.

REMOVE PINCHED WIRE HARNESS

4.	INSPECT NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (DAMPER)

(a) Remove the No. 1 blower damper servo sub-assembly.

Click here

(b) Operate the air inlet dampers by hand.

OK:

The air inlet dampers are easily operated by hand.

REPLACE BLOWER ASSEMBLY

5.	INSPECT AIR CONDITIONING HARNESS ASSEMBLY

(a) Disconnect the No. 1 air conditioning radiator damper servo sub-assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A-6 (STE2) - B-3 (sigB)	Always	Below 1 Ω
A-5 (STE1) - B-2 (sigA)	Always	Below 1 Ω
A-8 (M-) - B-5 (M-)	Always	Below 1 Ω
A-7 (M+) - B-4 (M+)	Always	Below 1 Ω
A-4 (GND) - B-1 (GND)	Always	Below 1 Ω
A-6 (STE2) or B-3 (sigB) - Other terminals and Body ground	Always	10 kΩ or higher
A-5 (STE1) or B-2 (sigA) - Other terminals and Body ground	Always	10 kΩ or higher
A-8 (M-) or B-5 (M-) - Other terminals and Body ground	Always	10 kΩ or higher
A-7 (M+) or B-4 (M+) - Other terminals and Body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

6.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the No. 1 air conditioning radiator damper servo sub-assembly connector.

(b) Remove the No. 2 air conditioning radiator damper servo sub-assembly.

Click here

(c) Connect the No. 1 blower damper servo sub-assembly connector to the No. 2 air conditioning radiator damper servo sub-assembly.

(d) Connect the Techstream to the DLC3.

(e) Turn the engine switch on (IG).

(f) Turn the Techstream on.

(g) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(h) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Inlet Damper Targ Pulse

No. 1 blower damper servo sub-assembly pulse*

Min.: 128

Max.: 383

Operates between 220 and 256 pulses

*: Though this Active Test is for the No. 1 blower damper servo sub-assembly, in this case it is used to check the operation of the No. 2 air conditioning radiator damper servo sub-assembly.

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Inlet Damper Targ Pulse

OK:

The No. 2 air conditioning radiator damper servo sub-assembly operates.

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

Air Outlet Damper Control Servo Motor Circuit (Rear) (B1449)

DESCRIPTION

The No. 2 air conditioning radiator damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air outlet damper to the appropriate position, which controls the rear air outlet switching. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1449

Air Outlet Damper Control Servo Motor Circuit (Rear)

Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly

No. 2 air conditioning radiator damper servo sub-assembly
Air conditioning harness assembly
Air conditioning amplifier assembly
Air conditioning radiator assembly

Memorized

(30 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

DTC Detection Condition Combination Table

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	No. 2 air conditioning radiator damper servo sub-assembly operating	○	○
Malfunction	Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value does not change	○	-
Malfunction	Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value is abnormal	-	○
Detection Time		Continuously for 30 seconds or more	Continuously for 30 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Confirm that no mechanical problems are present because this DTC can be stored when either a damper link or damper is mechanically locked.
When installing a damper servo motor, make sure to install it correctly.
Click here
After replacing a damper servo motor, make sure to perform Servo Motor Initialization.
Click here

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTC B1497 is not output	A
DTC B1497 is output	B

GO TO DTC B1497

2.	INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) Check that the No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

Click here

OK:

The No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY

3.	INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) Check for a wire harness caught between the links of the motors and dampers.

OK:

No wire harnesses are caught between the links of the motors and dampers.

REMOVE PINCHED WIRE HARNESS

4.	INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

(a) Remove the No. 2 air conditioning radiator damper servo sub-assembly.

Click here

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

5.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.

Click here

(b) Connect the No. 1 air conditioning radiator damper servo sub-assembly connector to the No. 2 air conditioning radiator damper servo sub-assembly.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(g) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Outlet Servo Pulse (D)

No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse*

Min.: 128

Max.: 383

Operates between 241 and 348 pulses

*: Though this Active Test is for the No. 1 air conditioning radiator damper servo sub-assembly, in this case it is used to check the operation of the No. 2 air conditioning radiator damper servo sub-assembly.

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Outlet Servo Pulse (D)

OK:

The No. 2 air conditioning radiator damper servo sub-assembly operates.

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

Compressor Solenoid Circuit (B1451)

DESCRIPTION

The cooler compressor assembly receives refrigerant compression demand signals from the air conditioning amplifier assembly.

Based on this signal, the cooler compressor assembly changes the amount of compressor output.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1451	Compressor Solenoid Circuit	Open or short in compressor solenoid circuit	Cooler compressor assembly Harness or connector Air conditioning amplifier assembly	-

WIRING DIAGRAM

PROCEDURE

1.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a	Front view of wire harness connector (to Cooler Compressor Assembly)

(a) Disconnect the C59 cooler compressor assembly connector.

(b) Connect an oscilloscope to terminal C59-2 (SOL+) and body ground and check the waveform.

Item	Content
Tool Setting	5 V/DIV., 500 μs./DIV.
Condition	Engine running Blower switch: LO A/C switch: On

OK:

Waveform is similar to that shown in the illustration.

REPLACE COOLER COMPRESSOR ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G35 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C59-2 (SOL+) - G35-3 (SOL+)	Always	Below 1 Ω
C59-2 (SOL+) or G35-3 (SOL+) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Communication Malfunction (Bus Ic) (B1497)

DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1497

Communication Malfunction (Bus Ic)

Error or open in communication line

Air conditioning harness assembly
No. 1 air conditioning radiator damper servo sub-assembly
No. 2 air conditioning radiator damper servo sub-assembly
Air conditioning amplifier assembly

Memorized

(10 sec. or more)*

*: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

WIRING DIAGRAM

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

A/O Servo Pulse(Rr D)

No. 2 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 158 and 260 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
A/O Servo Pulse(Rr D)

Result	Proceed to
All of the damper servo motors are malfunctioning	A
One of the damper servo motors is malfunctioning	B

GO TO STEP 4

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Disconnect the No. 1 air conditioning radiator damper servo sub-assembly connector.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Active test.

(f) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

A/O Servo Pulse(Rr D)

No. 2 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 158 and 260 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
A/O Servo Pulse(Rr D)

OK:

The damper servo motor operates smoothly.

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

3.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a	Component with harness connected (Air Conditioning Amplifier Assembly)

NOTICE:

When inspecting the air conditioning amplifier assembly, do not bring the tester probes too close to each other as a short circuit may occur.

(a) Disconnect the z8 air conditioning amplifier assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
z8-4 (B BUS) - Body ground	Engine switch on (IG)	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
z8-2 (BUS G) - Body ground	Always	Below 1 Ω

(d) Using an oscilloscope, check the waveform.

Item	Content
Terminal No.	z8-3 (BUS) - z8-2 (BUS G)
Tool Setting	2 V/DIV., 2 ms./DIV.
Condition	Engine switch on (IG)

OK:

Waveform is similar to that shown in the illustration.

HINT:

The waveform varies with the blower speed.

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

4.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

A/O Servo Pulse(Rr D)

No. 2 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 158 and 260 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
A/O Servo Pulse(Rr D)

Result	Proceed to
Only the No. 1 air conditioning radiator damper servo sub-assembly does not operate	A
Only the No. 2 air conditioning radiator damper servo sub-assembly does not operate	B

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

5.	INSPECT AIR CONDITIONING HARNESS ASSEMBLY (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY)

(a) Disconnect the z8 air conditioning amplifier assembly connector.

(b) Disconnect the No. 1 air conditioning radiator damper servo sub-assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
z8-2 (BUS G) - A-3 (GND)	Always	Below 1 Ω
z8-3 (BUS) - A-2 (LIN)	Always	Below 1 Ω
z8-4 (B BUS) - A-1 (+B)	Always	Below 1 Ω

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Blower Motor Circuit

DESCRIPTION

The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

If the airflow volume is low or the blower speed cannot be changed, the following factors may be the cause.

Symptom	Factor
Airflow volume cannot be changed	Air conditioning amplifier assembly malfunction Blower motor with fan sub-assembly malfunction Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Blower Motor

Blower motor with fan sub-assembly

Min.: 0

Max.: 31

Body Electrical > Air Conditioner > Active Test

Tester Display
Blower Motor

Result	Proceed to
Blower motor with fan sub-assembly does not operate	A
Blower motor with fan sub-assembly operates but does not change speed	B

GO TO STEP 5

2.	CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - POWER SOURCE AND BODY GROUND)

(a) Disconnect the A16 blower motor with fan sub-assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A16-3 (+B) - Body ground	Always	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
A16-1 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G35 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A16-2 (SI) - G35-6 (BLW)	Always	Below 1 Ω
A16-2 (SI) or G35-6 (BLW) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY

*a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

(a) Connect the A16 blower motor with fan sub-assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G35-6 (BLW) - Body ground	Always	4.75 to 5.25 V

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

5.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a	Component with harness connected (Air Conditioning Amplifier Assembly)

(a) Connect the G35 air conditioning amplifier assembly connector.

(b) Turn the engine switch on (IG).

(d) Using an oscilloscope, check the waveform.

Item	Content
Terminal No.	G35-6 (BLW) - G35-4 (GND)
Tool Setting	2 V/DIV., 1 ms./DIV.
Condition	Engine switch on (IG) Blower speed: LO

OK:

Waveform is similar to that shown in the illustration.

HINT:

The waveform varies with the blower speed.

REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Blower Motor does not Operate

DESCRIPTION

If air does not flow from the front registers after the blower switch on the air conditioning control panel (radio and display receiver assembly) is operated, the following factors may be the cause.

Symptom	Factor
No air flows from the registers	Air conditioning amplifier assembly malfunction Blower motor with fan sub-assembly malfunction Warm-up control Engine coolant temperature sensor malfunction Harness or connector

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM (MANUAL MODE)

(a) Turn off the AUTO switch, operate the blower switch and check that the blower motor with fan sub-assembly can be operated manually.

OK:

The blower motor with fan sub-assembly operates normally.

GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit)

2.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: -40°C (-40°F), Max.: 140°C (284°F)

75 to 100°C (167 to 212°F): After warming up

This is the engine coolant temperature.

HINT:

After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

GO TO COOLING SYSTEM

Cooling is Poor

DESCRIPTION

If the cooling effect of the air conditioning system is weak, the following factors may be the cause.

Symptom	Factor
Cooling effectiveness is poor Cooling response is slow	ECO mode control of air conditioning system is enabled Cooler compressor assembly malfunction Refrigerant volume (high) Refrigerant volume (low) Clogged cooler condenser assembly fins Cooling fan system malfunction Mechanical locking of damper and damper link Automatic light control sensor malfunction High inlet air temperature Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	CHECK ECO MODE SETTING

(a) Check if the ECO mode indicator is off.

OK:

The ECO mode indicator is off.

GO TO STEP 3

2.	CHECK ECO MODE CONTROL OPERATION

(a) Operate the ECO switch assembly (electric parking brake switch assembly) and check that the ECO mode indicator turns off and the blower speed reduction is canceled.

HINT:

When ECO mode control is operating, the air conditioning amplifier assembly controls the air conditioning system to enhance fuel efficiency. Therefore, explain to the customer that, when ECO mode control is operating, the blower speed will be reduced.

Control	Outline
Blower Control	When the air conditioning system is in AUTO mode, the blower speed will be reduced to a certain speed. Additionally, if warm-up control is operating, the blower speed will be further reduced.
Air Inlet Control	If the ambient temperature is a certain value or more, the air inlet mode will be changed to recirculation mode.

In some situations, ECO mode control may not operate even though it is enabled.

Result	Proceed to
ECO mode indicator turns off and blower speed reduction is canceled	A
ECO mode indicator turns off, but the blower speed reduction is not canceled	B
ECO mode indicator does not turn off	B

GO TO ECO Switch Circuit

3.	PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item	Condition
A/C switch	On
Ambient temperature*	0 to 49°C (32 to 120°F)
Blower speed	HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

REPAIR REFRIGERANT LEAK

4.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 and 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(P)

OK:

Each damper servo motor operates.

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

5.	CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G23 automatic light control sensor connector.

(b) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G23-1 (CLTB) - G33-23 (CLTB)	Always	Below 1 Ω
G23-2 (CLTE) - G33-25 (CLTE)	Always	Below 1 Ω
G23-4 (CLTS) - G33-24 (CLTS)	Always	Below 1 Ω
G23-1 (CLTB) or G33-23 (CLTB) - Other terminals and body ground	Always	10 kΩ or higher
G23-2 (CLTE) or G33-25 (CLTE) - Other terminals and body ground	Always	10 kΩ or higher
G23-4 (CLTS) or G33-24 (CLTS) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT AUTOMATIC LIGHT CONTROL SENSOR

(a) Remove the automatic light control sensor.

Click here

(b) Inspect the automatic light control sensor.

Click here

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

REPLACE AUTOMATIC LIGHT CONTROL SENSOR

Customize Parameters

CUSTOMIZE PARAMETERS

CUSTOMIZE AIR CONDITIONING SYSTEM

(a) Customizing with the Techstream.

NOTICE:

When the customer requests a change in a function, first make sure that the function can be customized.
Be sure to make a note of the current settings before customizing.
When troubleshooting a function, first make sure that the function is set to the default setting.

HINT:

The following items can be customized.

(1) Connect the Techstream.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Customize Setting / Air Conditioner.

(5) Select the setting by referring to the table below.

Air Conditioner

Tester Display	Description	Default	Setting	ECU
Set Temperature Shift	Function to perform control with the shifted temperature versus the displayed temperature	Normal	00001:-2C,00010:-1C,00100:Normal,01000:+1C,10000:+2C	Air conditioning amplifier assembly
Evaporator Control	Function to set the evaporator control to the automatic position (Automatic) to save power or to the coldest position (Manual) to dehumidify the air and to prevent the windows from fogging up	Automatic	0:Automatic,1:Manual	Air conditioning amplifier assembly
Compressor Mode	Function to turn the A/C on automatically by pressing the AUTO switch when the blower is on and the A/C is off	Automatic	0:Automatic,1:Manual	Air conditioning amplifier assembly
Air Inlet Mode	Function to change the mode automatically to recirculation air mode when turning the A/C on to cool the cabin quickly*1	Automatic	0:Automatic,1:Manual	Air conditioning amplifier assembly
Foot/DEF Auto Mode	Function to change the air outlet mode to foot/defroster automatically when AUTO mode is on	ON	0:ON,1:OFF	Air conditioning amplifier assembly
Foot/DEF Automatic Blow Up Function	Function to increase the blower level automatically when the defroster is on	ON	0:ON,1:OFF	Air conditioning amplifier assembly
Ambient Temperature Shift	Function to display the shifted ambient temperature versus the actual ambient temperature	Normal	0000001:-3C,0000010:-2C,0000100:-1C,0001000:Normal,0010000:+1C,0100000:+2C,1000000:+3C	Air conditioning amplifier assembly
ECO MODE Cancel	Function to disable the operation of the ECO switch assembly when set to OFF*2	OFF	0:OFF,1:ON	Air conditioning amplifier assembly
Refrigerant Shortage Check	Function to cancel the refrigerant shortage check (check performed during normal operation) when set to ON	ON	0:ON,1:OFF	Air conditioning amplifier assembly
Fan speed increment control	Function to set the speed to reach the target blower fan speed when AUTO mode is on	Normal	001:Slow,010:Normal,100:Fast	Air conditioning amplifier assembly
Outside Air Mode Auto Switch Function	Function to automatically change the air inlet to FRESH mode when the engine switch is off for 60 seconds	ON	0:ON,1:OFF	Air conditioning amplifier assembly

*1: except USA and Canada
*2: Make sure to disable ECO mode control before setting this customize setting to ON.

(b) Customizing with the multi-display.

(1) Turn the engine switch on (IG).

(2) Enter the following menus: MENU / Setup / Vehicle / Vehicle Customization / Climate Settings.

(3) Select the setting by referring to the table below.

Display	Default	Content	Setting	Relevant ECU
Auto A/C Mode	On	Function to turn the A/C on automatically by pressing the AUTO switch when the blower is on and the A/C is off	On or Off	Air conditioning amplifier assembly

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus:

(1) for Air Conditioner: Body Electrical / Air Conditioner / Data List.

(2) for Engine: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Room Temperature Sensor	Cooler (room temp. sensor) thermistor	Min.: -6.50°C (20.30°F) Max.: 57.25°C (135.05°F)	Actual cabin temperature displayed	Cooler (room temp. sensor) thermistor circuit malfunction When open circuit: -6.50°C (20.30°F) When short circuit: 57.25°C (135.05°F)
Ambient Temp Sensor	Thermistor assembly	Min.: -23.30°C (-9.94°F) Max.: 65.95°C (150.71°F)	Actual ambient temperature displayed	Thermistor assembly circuit malfunction When open circuit: -23.30°C (-9.94°F) When short circuit: 65.95°C (150.71°F)
Adjusted Ambient Temp	Adjusted ambient temperature	Min.: -30.80°C (-23.44°F) Max.: 50.80°C (123.44°F)	Adjust ambient temperature displayed	Air conditioning amplifier assembly malfunction
Evaporator Fin Thermistor	No. 1 cooler thermistor	Min.: -29.70°C (-21.46°F) Max.: 59.55°C (139.19°F)	Actual evaporator temperature displayed	No. 1 cooler thermistor circuit malfunction When open circuit: -29.70°C (-21.46°F) When short circuit: 59.55°C (139.19°F)
Evaporator Target Temp	Evaporator target temperature	Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F)	Evaporator target temperature displayed	No. 1 cooler thermistor circuit malfunction When open circuit: -327.68°C (-557.82°F) When short circuit: 327.67°C (621.81°F)
Solar Sensor (D Side)	Driver side automatic light control sensor	Min.: 0 Max.: 255	Driver side automatic light control sensor value increases as brightness increases	Driver side automatic light control sensor circuit malfunction When open circuit: 0 When short circuit: 255
Solar Sensor (P Side)	Front passenger side automatic light control sensor	Min.: 0 Max.: 255	Front passenger side automatic light control sensor value increases as brightness increases	Front passenger side automatic light control sensor circuit malfunction When open circuit: 0 When short circuit: 255
Engine Coolant Temp	Engine coolant temperature sensor	Min.: 1.30°C (34.34°F) Max.: 90.55°C (194.99°F)	Actual engine coolant temperature displayed	SFI system malfunction CAN communication system malfunction
Blower Motor Speed Level	Blower motor speed level	Min.: 0 Max.: 31	Displayed speed level increases in range between 0 and 31 as blower motor speed increases	Blower motor with fan sub-assembly circuit malfunction
Regulator Pressure Sensor	Air conditioner pressure sensor	Min.: -66.2 psi (gauge) Max.: 478.0 psi (gauge)	Actual refrigerant pressure displayed	Refrigerant line (gas leak etc.) Air conditioner pressure sensor circuit malfunction
Regulator Control Current	Solenoid valve control current	Min.: 0 A Max.: 0.997 A	Value changes between 0 A and 0.997 A in accordance with solenoid valve operation	Cooler compressor assembly circuit malfunction
Air Outlet Servo Pulse (R)	No. 2 air conditioning radiator damper servo sub-assembly target pulse	Min.: 128 Max.: 383	FACE: 260 (pulse) B/L: 212 (pulse) FOOT: 182 (pulse) F/D: 220 (pulse) SHUT: 158 (pulse) D/F: 177 (pulse)	No. 2 air conditioning radiator damper servo sub-assembly circuit malfunction
Air Outlet Servo Actual Pls(R)	No. 2 air conditioning radiator damper servo sub-assembly actual pulse	Min.: 128 Max.: 383	FACE: 260 (pulse) B/L: 212 (pulse) FOOT: 182 (pulse) F/D: 220 (pulse) SHUT: 158 (pulse) D/F: 177 (pulse)	No. 2 air conditioning radiator damper servo sub-assembly circuit malfunction
Air Mix Servo Targ Pulse(D)	No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix or air mix) target pulse	Min.: 128 Max.: 383	MAX COLD: 257 (pulse) MAX HOT: 165 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) circuit malfunction
Air Mix Servo Actual Pulse(D)	No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix or air mix) actual pulse	Min.: 128 Max.: 383	MAX COLD: 257 (pulse) MAX HOT: 165 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) circuit malfunction
Air Mix Servo Targ Pulse(P)	No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) target pulse	Min.: 128 Max.: 383	MAX COLD: 255 (pulse) MAX HOT: 347 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) circuit malfunction
Air Mix Servo Actual Pulse(P)	No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) actual pulse	Min.: 128 Max.: 383	MAX COLD: 255 (pulse) MAX HOT: 347 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) circuit malfunction
Air Outlet Servo Pulse (D)	No. 1 air conditioning radiator damper servo sub-assembly (mode) target pulse	Min.: 128 Max.: 383	FACE-R: 241 (pulse) FACE: 256 (pulse) FACE1: 256 (pulse) FACE2: 256 (pulse) B/L: 267 (pulse) B/L2: 267 (pulse) FOOT-R: 305 (pulse) FOOT: 297 (pulse) FOOT-D: 305 (pulse) FOOT-0: 288 (pulse) F/D: 320 (pulse) DEF-FOOT: 339 (pulse) DEF or SHUT: 348 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (mode) circuit malfunction
Air Outlet Servo Actu Pulse(D)	No. 1 air conditioning radiator damper servo sub-assembly (mode) actual pulse	Min.: 128 Max.: 383	FACE-R: 241 (pulse) FACE: 256 (pulse) FACE1: 256 (pulse) FACE2: 256 (pulse) B/L: 267 (pulse) B/L2: 267 (pulse) FOOT-R: 305 (pulse) FOOT: 297 (pulse) FOOT-D: 305 (pulse) FOOT-0: 288 (pulse) F/D: 320 (pulse) DEF-FOOT: 339 (pulse) DEF or SHUT: 348 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (mode) circuit malfunction
Air Inlet Damper Targ Pulse	No. 1 blower damper servo sub-assembly target pulse	Min.: 128 Max.: 383	Recirculation: 256 (pulse) Fresh: 220 (pulse)	No. 1 blower damper servo sub-assembly circuit malfunction
Air Inlet Damper Actual Pulse	No. 1 blower damper servo sub-assembly actual pulse	Min.: 128 Max.: 383	Recirculation: 256 (pulse) Fresh: 220 (pulse)	No. 1 blower damper servo sub-assembly circuit malfunction
Shift Set Temperature	Shift set temperature	2C decr, 1C decr, Normal, 1C incr or 2C incr	Customized value displayed	-
Air Inlet Mode	Air inlet mode	Auto or Manual	Customized value displayed	*1
Compressor Mode	Compressor mode	Auto or Manual	Customized value displayed	-
Evaporator Control	Evaporator control	Auto or Manual	Customized value displayed	-
ECO MODE Cancel	ECO mode cancel	OFF or ON	Customized value displayed	-
ECO Switch	ECO switch assembly (electric parking brake switch assembly)	OFF or ON	OFF: ECO switch assembly (electric parking brake switch assembly) not pushed ON: ECO switch assembly (electric parking brake switch assembly) pushed and held	ECO switch assembly (electric parking brake switch assembly) circuit malfunction
Refrigerant Shortage Check	Refrigerant shortage check	ON or OFF	Customized value displayed	-
Fan speed increment control	Fan speed increment control	Slow, Normal or Fast	Customized value displayed	-
Foot/DEF Auto Mode	Foot/defroster auto mode	ON or OFF	Customized value displayed	-
Foot/DEF Auto Blow Up	Foot/defroster auto blower speed increase	ON or OFF	Customized value displayed	-
Ambient Temperature Shift	Ambient temperature shift	3C decr, 2C decr, 1C decr, Normal, 1C incr, 2C incr or 3C incr	Customized value displayed	-
A/C Cutoff Signal	A/C control cutoff signal	OFF or ON	The ECM sends the air conditioning control cutoff signal displayed	-
Refrigerant Gas Type	Refrigerant gas type	R134a or 1234yf	Refrigerant gas type displayed	-
Set Temperature (D Side)	Driver side set temperature	Min.: MAX COLD Max.: MAX HOT	Driver side set temperature displayed	-
Set Temperature (P Side)	Front passenger side set temperature	Min.: MAX COLD Max.: MAX HOT	Front passenger side set temperature displayed	-
Outside Air Mode Auto Switch Function	Outside air mode auto switch function	ON or OFF	Customized value displayed	-
Number of Trouble Codes	Number of trouble codes	Min.: 0 Max.: 255	Number of DTCs displayed	-
Refrigerant High Pressure History	Refrigerant high pressure history	Min.: 0 Max.: 255	Number of times refrigerant high pressure history stored displayed	*2

*1: except USA and Canada
*2: Refer to the following procedure to clear the refrigerant high pressure history.
Click here

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: -40°C (-40°F)

Max.: 140°C (284°F)

75 to 100°C (167 to 212°F): After warming up

This is the engine coolant temperature.

HINT:

After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Check if the engine overheats if the value indicated is higher than 135°C (275°F).

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Blower Motor	Blower motor with fan sub-assembly	Min.: 0 Max.: 31	-
Magnetic Clutch Relay	Air conditioning system operation	OFF or ON	-
Defogger Relay (Rear)	Rear window defogger	OFF or ON	-
Air Mix Servo Targ Pulse(D)	No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse	Min.: 128 Max.: 383	Operates between 165 and 257 pulses
Air Mix Servo Targ Pulse(P)	No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse	Min.: 128 Max.: 383	Operates between 255 and 347 pulses
Air Outlet Servo Pulse (D)	No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse	Min.: 128 Max.: 383	Operates between 241 and 348 pulses
Air Inlet Damper Targ Pulse	No. 1 blower damper servo sub-assembly pulse	Min.: 128 Max.: 383	Operates between 220 and 256 pulses
A/O Servo Pulse(Rr D)	No. 2 air conditioning radiator damper servo sub-assembly pulse	Min.: 128 Max.: 383	Operates between 158 and 260 pulses

Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

Air conditioning system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.

CHECK DLC3

Check the DLC3.

Click here

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Air Conditioning System (for Gasoline Model)

DTC No.	Detection Item	DTC Detection Condition
B1411	Room Temperature Sensor Circuit	Open or short in room temperature sensor circuit
B1412	Ambient Temperature Sensor Circuit	Open or short in ambient temperature sensor circuit
B1413	Evaporator Temperature Circuit or Evaporator Fin Thermistor	Open or short in evaporator temperature sensor circuit
B1422	Compressor Lock	Open or short in A/C lock sensor circuit
B1423	Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure	Open or short in air conditioner pressure sensor circuit Refrigerant pressure on high pressure side is extremely low (176 kPa (1.8 kgf/cm2, 26 psi) or less) or extremely high (3025 kPa (30.8 kgf/cm2, 439 psi) or more)
B1441	Air Mix Damper Control Servo Motor Circuit (Passenger Side)	Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix)
B1442	Air Inlet Damper Control Servo Motor	Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly
B1443	Air Outlet Damper Control Servo Motor Circuit	Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (mode)
B1446	Air Mix Damper Control Servo Motor Circuit (Driver Side)	Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix)
B1449	Air Outlet Damper Control Servo Motor Circuit (Rear)	Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly
B1451	Compressor Solenoid Circuit	Open or short in compressor solenoid circuit
B1497	Communication Malfunction (Bus Ic)	Error or open in communication line
B14B2	Lost Communication with Front Panel LIN	Lost communication with air conditioning control assembly
B14B8	Refrigerant Shortage	The following condition is detected in the normal operation refrigerant shortage check: Amount of refrigerant is insufficient
B14BD	Refrigerant Overabundance Filling Malfunction	All of the following conditions are met 2 times or more in the same trip: The vehicle speed is 20 km/h or more The amount of compressor oil is within the insufficient compressor oil range for 60 seconds or more
U0100	Lost Communication With ECM/PCM "A"	No communication with ECM
U0131	Lost Communication With Power Steering Control Module	No communication with power steering ECU (rack and pinion power steering gear assembly)
U0142	Lost Communication With Body Control Module "B"	No communication with main body ECU (multiplex network body ECU)
U0151	Lost Communication With Restraints Control Module	No communication with airbag ECU assembly
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	No communication with combination meter assembly
U0163	Lost Communication With Navigation Control Module	No communication with air conditioning control panel (radio and display receiver assembly)

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.

Body Electrical > Air Conditioner > Trouble Codes

(e) Check for DTCs.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.

Body Electrical > Air Conditioner > Clear DTCs

(e) Clear the DTCs.

ECO Switch Circuit

DESCRIPTION

When the ECO switch assembly (electric parking brake switch assembly) is operated, the air conditioning amplifier assembly receives a signal and enables or disables ECO mode control of the air conditioning system.

Symptom	Factor
When ECO switch assembly (electric parking brake switch assembly) is operated, blower speed does not change	Air conditioning amplifier assembly malfunction ECO switch assembly (electric parking brake switch assembly) malfunction Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ECO Switch

ECO switch assembly (electric parking brake switch assembly)

OFF or ON

OFF: ECO switch assembly (electric parking brake switch assembly) not pushed

ON: ECO switch assembly (electric parking brake switch assembly) pushed and held

ECO switch assembly (electric parking brake switch assembly) circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
ECO Switch

OK:

ECO switch assembly (electric parking brake switch assembly) condition displayed on the Techstream changes with the actual switch operation.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Remove the ECO switch assembly (electric parking brake switch assembly).

Click here

(b) Inspect the ECO switch assembly (electric parking brake switch assembly).

Click here

REPLACE ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

3.	CHECK HARNESS AND CONNECTOR (ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the G36 air conditioning amplifier assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G24-11 (ECU) - G36-20 (ECOS)	Always	Below 1 Ω
G24-16 (GND1) - Body ground	Always	Below 1 Ω
G24-11 (ECU) or G36-20 (ECOS) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Front Window Fogging

DESCRIPTION

If the windshield frequently fogs up even though the air conditioning system is operating, the following factors may be the cause.

Symptom	Factor
Windshield frequently fogs up	Cooler compressor assembly malfunction Refrigerant volume (low) Cooler expansion valve (opened excessively) No. 1 air conditioning radiator damper servo sub-assembly malfunction Mechanical locking of damper and damper link

PROCEDURE

1.	PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item	Condition
A/C switch	On
Ambient temperature*	0 to 49°C (32 to 120°F)
Blower speed	HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

CHARGE SYSTEM WITH REFRIGERANT

2.	CHECK OPERATION

(a) Press the front defroster switch on the air conditioning control panel (radio and display receiver assembly).

OK:

The air outlet mode changes to DEF mode.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

GO TO DTC B1443

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the air conditioning system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

The following 5 items are important points for problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Driving conditions, weather conditions
How did it happen?	Problem symptoms

3.	INSPECT BATTERY VOLTAGE

(a) Inspect the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

4.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check for CAN communication system DTCs.

Click here

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

5.	CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output.

Body Electrical > Air Conditioner > Trouble Codes

(b) Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs

(c) Recheck for DTCs. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the operation indicated by the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

6.	CHECK AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Operate each switch on the air conditioning control panel (radio and display receiver assembly) and check that the switches of the air conditioning system operate normally.

GO TO PROBLEM SYMPTOMS TABLE

7.	CHECK BLOWER CONTROL

(a) Operate the blower switch on the air conditioning control panel (radio and display receiver assembly) and check that the blower control operates normally.

GO TO PROBLEM SYMPTOMS TABLE

8.	CHECK AIR INLET CONTROL

(a) Operate the recirculation/fresh switch on the air conditioning control panel (radio and display receiver assembly) and check that the air inlet control operates normally.

GO TO PROBLEM SYMPTOMS TABLE

9.	CHECK AIR OUTLET CONTROL

(a) Operate the air outlet mode switch on the air conditioning control panel (radio and display receiver assembly) and check that the air outlet control operates normally.

GO TO PROBLEM SYMPTOMS TABLE

10.	CHECK COOLING FUNCTION

(a) Operate the temperature adjustment switches on the air conditioning control panel (radio and display receiver assembly) and check that cool air is blown from the registers.

GO TO PROBLEM SYMPTOMS TABLE

11.	CHECK HEATER FUNCTION

(a) Operate the temperature adjustment switches on the air conditioning control panel (radio and display receiver assembly) and check that warm air is blown from the registers.

GO TO PROBLEM SYMPTOMS TABLE

12.	USE SIMULATION METHOD TO CHECK

Click here

13.	CONFIRMATION TEST

END

Initialization

INITIALIZATION

SERVO MOTOR INITIALIZATION

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Utility / Servomotor Initialization.

(f) According to the Techstream display, perform servo motor initialization.

Body Electrical > Air Conditioner > Utility

Tester Display
Servomotor Initialization

HINT:

When initialization is started, the AUTO switch indicator will illuminate and then will turn off when initialization has completed.

(g) Select Exit to complete initialization.

No Cool Air Comes Out

DESCRIPTION

If warm air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.

Symptom

Factor

No cool air comes out

(Blower control is normal)

Cooler compressor assembly malfunction
Refrigerant pressure is extremely high or low
Refrigerant volume (low)
Clogged cooler condenser assembly fins
Cooling fan system malfunction
Mechanical locking of damper and damper link
No. 1 cooler thermistor malfunction
High inlet air temperature

PROCEDURE

1.	CHECK SWITCH INDICATOR

(a) Operate each switch on the air conditioning control panel (radio and display receiver assembly) and check that the switch indicators operate normally.

OK:

All switch indicators operate normally.

GO TO OTHER DIAGNOSIS PROCEDURE (Operation not Accepted Even If Air Conditioning Switch is Operated)

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 and 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(P)

OK:

Each damper servo motor operates.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

No Warm Air Comes Out

DESCRIPTION

If cool air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.

Symptom	Factor
No warm air comes out (Blower control is normal) Outlet air temperature does not increase (Blower control is normal)	Engine coolant temperature (low) Refrigerant volume (low) No. 1 air conditioning radiator damper servo sub-assembly malfunction Warm-up control Blockage in heater radiator unit sub-assembly Heater radiator unit sub-assembly malfunction

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: -40°C (-40°F), Max.: 140°C (284°F)

75 to 100°C (167 to 212°F): After warming up

This is the engine coolant temperature.

HINT:

After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.

GO TO COOLING SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 and 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 and 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(P)

OK:

Each damper servo motor operates.

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

Operation not Accepted Even If Air Conditioning Switch is Operated

DESCRIPTION

If the air conditioning system cannot be operated using the air conditioning control panel (radio and display receiver assembly), the following factors may be the cause.

Symptom

Factor

Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver assembly)

(With the exception of the switch indicators, no inputs are reflected when other switches operated)

LIN communication malfunction between air conditioning amplifier assembly and air conditioning control panel (radio and display receiver assembly)
Short to +B or ground in air conditioning amplifier assembly circuit
Air conditioning amplifier assembly malfunction
Air conditioning control panel (radio and display receiver assembly) malfunction
Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B14B2 is not output	A
B14B2 is output	B

GO TO DTC B14B2

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY AND BODY GROUND)

*a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

(a) Disconnect the G35 air conditioning amplifier assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G35-1 (B) - Body ground	Always	11 to 14 V
G35-2 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V
G35-2 (IG+) - Body ground	Engine switch off	Below 1 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
G35-4 (GND) - Body ground	Always	Below 1 Ω

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Parts Location

PARTS LOCATION

ILLUSTRATION

*1	AIR CONDITIONER PRESSURE SENSOR	*2	COOLER CONDENSER ASSEMBLY
*3	MAGNET CLUTCH ASSEMBLY	*4	MG CLT RELAY
*5	THERMISTOR ASSEMBLY	*6	COOLER COMPRESSOR ASSEMBLY
*7	COMPRESSOR ASSEMBLY WITH MAGNETIC CLUTCH	*8	POWER STEERING ECU (RACK AND PINION POWER STEERING GEAR ASSEMBLY)
*9	ECM	*10	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - HTR FUSE - A/C COMP FUSE

ILLUSTRATION

*A	w/ Manual (SOS) Switch	-	-
*1	ECO SWITCH ASSEMBLY (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)	*2	COOLER (ROOM TEMP. SENSOR) THERMISTOR
*3	AUTOMATIC LIGHT CONTROL SENSOR	*4	AIR CONDITIONING AMPLIFIER ASSEMBLY
*5	COMBINATION METER ASSEMBLY	*6	DLC3
*7	AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY)	*8	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*9	AIRBAG ECU ASSEMBLY	*10	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-B NO. 2 FUSE - ECU-IG1 NO. 3 FUSE - ECU-IG1 NO. 4 FUSE - ECU-ACC FUSE
*11	DCM (TELEMATICS TRANSCEIVER)	-	-

ILLUSTRATION

*1	NO. 1 COOLER THERMISTOR	*2	HEATER RADIATOR UNIT SUB-ASSEMBLY
*3	AIR CONDITIONING RADIATOR ASSEMBLY	*4	BLOWER ASSEMBLY
*5	BLOWER MOTOR WITH FAN SUB-ASSEMBLY	*6	COOLER EXPANSION VALVE
*7	NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY	-	-

ILLUSTRATION

*1	NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY	*2	NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY
*3	NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY	*4	AIR CONDITIONING HARNESS ASSEMBLY

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

System Name	See Procedure
Lane Departure Alert System (w/ Steering Control)
Intelligent Clearance Sonar System
Parking Assist Monitor System
Panoramic View Monitor System
Pre-collision System
Lighting System (for Gasoline Model with Cornering Light)

DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME

*a	Charging Cylinder

ALWAYS WEAR EYE PROTECTION

BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN

If liquid refrigerant gets in your eyes or on your skin.

(a) Wash the area with lots of cold water.

CAUTION:

Do not rub your eyes or skin.

(b) Apply clean petroleum jelly to the skin.

NEVER HEAT CONTAINER OR EXPOSE CONTAINER TO AN OPEN FLAME

BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT

DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM

If there is not enough refrigerant in the air conditioning system, oil lubrication will be insufficient and the compressor may be damaged.

Necessary care should be taken to avoid this.

DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING

*a	Wrong
*b	Okay

Open and close only the low pressure valve.

If the high pressure valve is opened, refrigerant will flow in the reverse direction causing the charging cylinder to rupture.

BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT

If the system is overcharged with refrigerant, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.

DO NOT OPERATE ENGINE AND COMPRESSOR WITH NO REFRIGERANT

CAUTION:

Doing so may damage the inside of the compressor because the compressor parts always move regardless of whether the air conditioning system is turned on or off.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

This vehicle is equipped with a Supplemental Restraint System (SRS). Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices.

Click here

GENERAL PRECAUTION

While using the battery during inspection, do not bring the positive (+) and negative (-) tester probes too close to each other as a short circuit may occur.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

VEHICLE CHECK ITEMS

HINT:

You can reduce the number of systems to check by using the results of the following operation check
Perform the following checks based on Customer Feedback and the vehicle condition.
The customer's opinion may not be consistent with the actual problem (eg: the cooling performance of the air conditioner is bad → actually, the wind volume is weak). It is important to check the problem symptoms accurately and judge correctly based on various sources of information.
Judgment as to whether the air conditioner panel is normal or abnormal can be judged by checking if the indicator illuminates or turns off when the switch is operated.
During servo motor initialization, the AUTO indicator light comes on, and then goes off when initialization has finished.
If the performance of the air conditioner is poor or there is a foul odor, check for clogging in the clean air filter.

Malfunction Operation/Function:

Common Function of Cool and Heater Function				Only Cool Air Function	Only Heater Function	Suspected Area
A/C Switch Operation	Blower Operation	Recirculation/Fresh Function	Air Outlet Changing Function	Only Cool Air Function	Only Heater Function	Suspected Area
x	o	o	o	x	x	Go to "Problem Symptoms Table: Air Conditioning Control"
o	o	o	o	x	o	Go to "Problem Symptoms Table: Cooling Function"
o	o	o	o	o	x	Go to "Problem Symptoms Table: Heater Function"
o	x	o	o	x	x	Go to "Problem Symptoms Table: Blower Control"
o	o	x	o	x	x	Go to "Problem Symptoms Table: Air Inlet Control"
o	o	o	x	x	x	Go to "Problem Symptoms Table: Air Outlet Control"
x	x	x	x	x	x	Air Conditioning Amplifier Assembly or Air Conditioning Assembly is Defective

AIR CONDITIONING CONTROL

Symptom	Suspected Area	Link
Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver assembly) (With the exception of the switch indicators, no inputs are reflected when other switches operated)	Air conditioning amplifier assembly Air conditioning control panel (radio and display receiver assembly)
Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver assembly) (Air conditioning system display operates)	Air conditioning control panel (radio and display receiver assembly)
Air conditioning system cannot be operated using air conditioning control panel (radio and display receiver assembly) immediately after starting the engine (Air conditioning system display operates) (Only AUTO indicator illuminates) (A/C switch indicator does not illuminate)	Refer to "INITIALIZATION"
A/C switch indicator does not illuminate	Air conditioning amplifier assembly Air conditioning control panel (radio and display receiver assembly) A/C switch A/C switch indicator Servo motor Damper and damper link Refrigerant pressure Ambient temperature

COOLING FUNCTION

Symptom	Suspected Area	Link
No cool air comes out (Blower control is normal)	Cooler compressor assembly Refrigerant pressure Refrigerant volume Cooler condenser assembly Cooling fan system Damper and damper link No. 1 cooler thermistor High inlet air temperature
Cooling effectiveness is poor Cooling response is slow	ECO switch assembly (electric parking brake switch assembly) Cooler compressor assembly Refrigerant volume Cooler condenser assembly Cooling fan system Damper and damper link Automatic light control sensor High inlet air temperature Harness or connector
Temperature of outlet air is cooler on left or right side (when same temperature set for both sides)	Cooler compressor assembly Refrigerant volume Damper and damper link Automatic light control sensor Harness or connector
Compressor assembly with pulley does not stop operating Refrigerant pressure does not decrease when A/C switch is turned off	Short to +B in air conditioning amplifier assembly circuit MG CLT relay Magnet clutch assembly

HEATER FUNCTION

Symptom

Suspected Area

Link

No warm air comes out
(Blower control is normal)
Outlet air temperature does not increase
(Blower control is normal)

Engine coolant temperature
Refrigerant volume
No. 1 air conditioning radiator damper servo sub-assembly
Damper and damper link
Warm-up control
Blockage in heater radiator unit sub-assembly
Heater radiator unit sub-assembly

Temperature of outlet air is warmer on left or right side

(when same temperature set for both sides)

Damper and damper link
Blockage in heater radiator unit sub-assembly
Harness or connector

BLOWER CONTROL

Symptom

Suspected Area

Link

Blower motor does not operate at all

(Air does not blow from registers)

Blower motor with fan sub-assembly
Air conditioning amplifier assembly
Warm-up control
Engine coolant temperature sensor
Harness or connector

Airflow volume cannot be changed

Air conditioning amplifier assembly
Blower motor with fan sub-assembly
Harness or connector

Airflow volume is constantly low
Airflow volume sometimes becomes low

Blower motor with fan sub-assembly
ECO switch assembly (electric parking brake switch assembly)
Clean air filter
No. 1 cooler evaporator sub-assembly or heater radiator unit sub-assembly fins
No. 1 cooler thermistor
Aspirator

AIR INLET CONTROL

Symptom	Suspected Area	Link
Air inlet mode changes between recirculation/fresh randomly Recirculation/fresh switch indicator is blinking	Customize setting* Ambient temperature Refrigerant pressure Air conditioner pressure sensor circuit Engine coolant temperature
Air inlet mode cannot be changed between recirculation/fresh Air inlet mode does not change between recirculation/fresh automatically	No. 1 blower damper servo sub-assembly Damper link Air inlet damper mechanically locked Engine coolant temperature Air conditioner unit assembly

*: except USA and Canada

AIR OUTLET CONTROL

Symptom

Suspected Area

Link

Air outlet mode cannot be changed

(air outlet display changes)

No. 1 air conditioning radiator damper servo sub-assembly
Damper link
Air conditioner unit assembly

Air outlet mode cannot be changed

(air outlet display does not change)

Air conditioning control panel (radio and display receiver assembly)

DEFROSTER CONTROL

Symptom	Suspected Area	Link
Windshield frequently fogs up	Cooler compressor assembly Refrigerant volume Cooler expansion valve No. 1 air conditioning radiator damper servo sub-assembly Damper and damper link

Recirculated/Fresh Air Modes do not Switch

DESCRIPTION

If the air inlet mode cannot be changed between recirculation/fresh or exhaust gas odors can be smelled even though recirculation mode is selected, the following factors may be the cause.

Symptom	Factor
Air inlet mode cannot be changed between recirculation/fresh Exhaust gas odors can be smelled when air inlet mode set to recirculation mode	No. 1 blower damper servo sub-assembly malfunction Damper link disconnection Air inlet damper mechanically locked Engine coolant temperature (high) Air conditioner unit assembly malfunction

PROCEDURE

1.	CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

The No. 1 blower damper servo sub-assembly is installed correctly.

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY CORRECTLY

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B1442 is not output	A
B1442 is output	B

GO TO DTC B1442

3.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: -40°C (-40°F), Max.: 140°C (284°F)

75 to 100°C (167 to 212°F): After warming up

This is the engine coolant temperature.

HINT:

After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.

REPLACE AIR CONDITIONER UNIT ASSEMBLY

GO TO COOLING SYSTEM

Recirculated/Fresh Air Modes Switch without User Input

DESCRIPTION

If recirculation/fresh mode changes unintentionally and without permission, the following causes are possible.

Symptom	Factor
Recirculation/fresh mode changes without permission Recirculation/fresh mode light blinks	Customize setting* Change in ambient air temperature Decrease in refrigerant pressure Air conditioner pressure sensor circuit malfunction Engine coolant temperature (high)

*: except USA and Canada

PROCEDURE

1.	CONFIRM MODEL

Result	Proceed to
for USA and Canada	A
except USA and Canada	B

GO TO STEP 3

2.	CHECK CUSTOMIZE SETTING

(a) Using the Techstream, check that the customize setting Air Inlet Mode is not set to "Automatic".

Air Conditioner

Tester Display	Description	Default	Setting	ECU
Air Inlet Mode	Function to change the mode automatically to recirculation air mode when turning the A/C on to cool the cabin quickly	Automatic	0:Automatic,1:Manual	Air conditioning amplifier assembly

OK:

Air Inlet Mode is not set to "Automatic".

CUSTOMIZE SETTING

3.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ambient Temp Sensor

Thermistor assembly

Min.: -23.30°C (-9.94°F)

Max.: 65.95°C (150.71°F)

Actual ambient temperature displayed

Thermistor assembly circuit malfunction

When open circuit: -23.30°C (-9.94°F)
When short circuit: 65.95°C (150.71°F)

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temp Sensor

OK:

The value of the display does not change frequently.

GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM

4.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Coolant Temperature

Engine coolant temperature

Min.: -40°C (-40°F), Max.: 140°C (284°F)

75 to 100°C (167 to 212°F): After warming up

This is the engine coolant temperature.

HINT:

After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

The value of the display does not change frequently.

GO TO COOLING SYSTEM

5.	CHECK REFRIGERANT PRESSURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -66.2 psi (gauge)

Max.: 478.0 psi (gauge)

Actual refrigerant pressure displayed

Refrigerant line (gas leak etc.)
Air conditioner pressure sensor circuit malfunction

Body Electrical > Air Conditioner > Data List

Tester Display
Regulator Pressure Sensor

(f) Install a manifold gauge set.

(g) Read the manifold gauge pressure when the following conditions are met.

(1) Prepare the vehicle according to the table below.

Measurement Condition:

Item	Condition
Vehicle doors	Fully open
Temperature setting	MAX COLD
Blower speed	HI
A/C switch	On
Recirculation/fresh switch	RECIRCULATION
Interior temperature	25 to 35°C (77 to 95°F)

Standard Pressure:

Low pressure side

150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)

High pressure side

1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

(h) Compare the values displayed in the Data List and on the manifold gauge.

OK:

The values displayed in the Data List and on the manifold gauge match.

GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE)

REPLACE AIR CONDITIONER PRESSURE SENSOR

System Description

SYSTEM DESCRIPTION

COMMUNICATION SYSTEM FUNCTION

(a) The air conditioning amplifier assembly communicates with each ECU via CAN communication and LIN communication. Additionally, the air conditioning amplifier assembly sends operation signals to each damper servo motor and receives damper position information and sensor information from the damper servo motors and No. 1 cooler thermistor through the air conditioning harness assembly.

Air Conditioning Amplifier Assembly ←→ Airbag ECU Assembly

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	Airbag ECU assembly	Front passenger seat belt buckle switch status signal	CAN
Air conditioning amplifier assembly	Airbag ECU assembly	Front passenger seat occupant status signal	CAN

Air Conditioning Amplifier Assembly ←→ Main Body ECU (Multiplex Network Body ECU)

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	Main body ECU (multiplex network body ECU)	Auto dimmer signal	CAN
		Front passenger door courtesy switch signal
		Rear right door courtesy switch signal
		Rear left door courtesy switch signal
		High beam headlight request signal
		Low beam headlight request signal
		Destination symbol signal
		Country code 1st signal
		Country code 2nd signal
		Country code 3rd signal
		Steering wheel signal
		Solar data (R) signal
		Solar data (L) signal
Main body ECU (multiplex network body ECU)	Air conditioning amplifier assembly	Rear defogger drive request signal	CAN
Main body ECU (multiplex network body ECU)	Air conditioning amplifier assembly	Ambient temperature display signal	CAN

Air Conditioning Amplifier Assembly ←→ Power Steering ECU (Rack and Pinion Power Steering Gear Assembly)

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	Power steering ECU (rack and pinion power steering gear assembly)	Loading control level signal	CAN
Power steering ECU (rack and pinion power steering gear assembly)	Air conditioning amplifier assembly	Ambient temperature display signal	CAN

Air Conditioning Amplifier Assembly ←→ Combination Meter Assembly

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	Combination meter assembly	Vehicle speed signal (meter to other)	CAN
Air conditioning amplifier assembly	Combination meter assembly	Temperature unit signal (centigrade/fahrenheit)	CAN
Combination meter assembly	Air conditioning amplifier assembly	Ambient temperature display signal	CAN
Combination meter assembly	Air conditioning amplifier assembly	Ambient temperature display whole number/decimal (0/0.5°C) signal	CAN

Air Conditioning Amplifier Assembly ←→ Air Conditioning Control Panel (Radio and Display Receiver Assembly)

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	Air conditioning control panel (radio and display receiver assembly)	AUTO switch state signal	CAN
		Rear defogger switch state signal
		Air outlet switch state signal
		OFF switch state signal
		A/C switch state signal
		SYNC switch state signal
		Mode switch state signal
		Blower up switch state signal
		Blower down switch state signal
		Driver side TEMP up switch state signal
		Driver side TEMP down switch state signal
		Front passenger side TEMP up switch state signal
		Front passenger side TEMP down switch state signal
		Blower level switch state signal 1
		Blower level switch state signal 2
		Blower level switch state signal 3
		Blower level switch state signal 4
		Blower level switch state signal 5
		Blower level switch state signal 6
		Blower level switch state signal 7
		Driver side seat speech recognition operation mode information signal
		Driver side seat speech recognition data addition subtraction information signal
		Driver side seat speech recognition temperature directions data signal
		Front passenger side seat speech recognition operation mode information signal
		Front passenger side seat speech recognition data addition subtraction information signal
		Front passenger side seat speech recognition temperature directions data signal
		AVN1S39 valid information
		Independent A/C control information signal	LIN
		AUTO composite switch operation signal
		AUTO switch operation signal
		OFF switch operation signal
		A/C switch operation signal
		Blower switch operation signal
		Air outlet mode switch operation signal
		Front defroster switch operation signal
		Rear defogger switch operation signal
		SYNC switch operation signal
		Driver side temperature setting signal
		Front passenger side temperature setting signal
		Front right seat heater switch signal
		Front left seat heater switch signal
		Existence of seat AUTO function signal
		Existence of seat ventilator/heater function signal
		Part number information 1 signal
		Part number information 2 signal
		Part number information 3 signal
		Part number information 4 signal
		Part number information 5 signal
Air conditioning control panel (radio and display receiver assembly)	Air conditioning amplifier assembly	A/C display request signal	CAN
		AUTO indicator signal
		Rear defogger indicator signal
		A/C indicator signal
		SYNC indicator signal
		Blower level indicator signal
		Outlet AUTO indicator signal
		Outlet indicator signal
		Blower manual status signal
		Blower customize indicator signal
		A/C on-screen request signal
		Driver side temperature display signal
		Front passenger side temperature display signal
		A/C screen select information signal
		Switch design DUAL/SYNC. Select information signal
		Temperature unit select information signal
		Blower step select information signal
		Speech recognition level information signal
		Destination select information signal
		Control information status signal
		Ambient temperature display signal
		Ambient temperature display whole number/decimal (0/0.5°C) signal
		ECO mode indicator signal	LIN
		Entire front panel display instruction signal
		AUTO indicator signal
		Blower level indicator signal
		Recirculation indicator signal
		Air outlet mode display signal
		Rear defogger indicator signal
		SYNC indicator signal
		Driver side temperature setting display signal
		Front passenger side temperature setting display signal
		Dimmer signal
		A/C indicator signal
		Front right seat heater indicator signal
		Front left seat heater indicator signal

Air Conditioning Amplifier Assembly ←→ ECM

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	ECM	Drive mode select signal	CAN
		Engine type information signal 1
		Engine type information signal 2
		Engine type information signal 3
		Engine type information signal 4
		Engine speed data signal
		Alternative field duty value signal
		Engine coolant temperature signal
		A/C control cut-off signal 1
		A/C control cut-off signal 2
		A/C control cut-off signal 3
		A/C control cut-off signal 4
		A/C control cut-off signal 5
		Variable control inhibition signal
		Compulsory internal air circulation at high coolant temperature command signal
ECM	Air conditioning amplifier assembly	Magnet clutch request signal	CAN
		A/C idle up request signal
		ECO switch information signal
		Heater idle up request signal
		Charging control inhibit signal
		Prior A/C control request signal
		Acceleration cut inhibit signal
		Generator control inhibit signal
		Request control by refrigerant signal
		Ambient temperature before correction signal
		Refrigerant information signal
		Evaporator temperature sensor signal
		Variable compressor solenoid current signal
		Air conditioner pressure sensor signal

Air Conditioning Amplifier Assembly ←→ DCM (Telematics Transceiver) (w/ Manual (SOS) Switch)

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	DCM (telematics transceiver)	Remote engine start system control signal	CAN
		Defogger control signal
		Air conditioner control signal
DCM (telematics transceiver)	Air conditioning amplifier assembly	Drive recorder ACN01 signal	CAN
		Drive recorder ACN02 signal
		Drive recorder ACN03 signal
		Drive recorder ACN04 signal
		Drive recorder ACN05 signal
		Drive recorder ACN06 signal
		Drive recorder ACN07 signal
		Drive recorder ACN08 signal
		In-vehicle temperature signal
		Ambient temperature display signal
		A/C control state signal

Air Conditioning Amplifier Assembly ←→ Damper Servo

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	No. 1 air conditioning radiator damper servo sub-assembly	Damper position signal	LIN
	No. 2 air conditioning radiator damper servo sub-assembly
	No. 1 blower damper servo sub-assembly
No. 1 air conditioning radiator damper servo sub-assembly	Air conditioning amplifier assembly
No. 2 air conditioning radiator damper servo sub-assembly
No. 1 blower damper servo sub-assembly

Air Conditioning Amplifier Assembly ←→ Blower Motor, Sensor, Switch, etc.

Receiver	Sender	Signal	Communication Line
Air conditioning amplifier assembly	Cooler (room temp. sensor) thermistor	Sensor value signal	Direct line
	Thermistor assembly
	Air conditioner pressure sensor
	No. 1 cooler thermistor
	Magnet clutch assembly	Operation signal
	ECO switch assembly (electric parking brake switch assembly)	ECO switch signal
Blower motor with fan sub-assembly	Air conditioning amplifier assembly	Drive signal	Direct line
Cooler compressor assembly
Magnetic clutch relay

System Diagram

SYSTEM DIAGRAM

Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G36-1 (SG-1) - Body ground	LG - Body ground	Ground for cooler (room temp. sensor) thermistor	Always	Below 1 V
G36-2 (SG-2) - Body ground	W - Body ground	Ground for thermistor assembly	Always	Below 1 V
G36-3 (SG-4) - Body ground	L - Body ground	Ground for air conditioner pressure sensor	Always	Below 1 V
G36-6 (S5-3) - G36-3 (SG-4)	GR - L	Power supply for air conditioner pressure sensor	Engine switch on (IG)	4.75 to 5.25 V
G36-6 (S5-3) - G36-3 (SG-4)	GR - L	Power supply for air conditioner pressure sensor	Engine switch off	Below 1 V
G36-9 (MGC) - G35-4 (GND)	G - W-B	Magnetic clutch operation signal	Engine running Blower switch: LO A/C switch: Off	11 to 14 V
G36-9 (MGC) - G35-4 (GND)	G - W-B	Magnetic clutch operation signal	Engine running Blower switch: LO A/C switch: On	Below 1 V
G36-13 (TAM) - G36-2 (SG-2)	R - W	Thermistor assembly signal	Engine switch on (IG) Ambient temperature: 25°C (77°F)	1.05 to 1.45 V
G36-13 (TAM) - G36-2 (SG-2)	R - W	Thermistor assembly signal	Engine switch on (IG) Ambient temperature: 40°C (104°F)	0.64 to 0.87 V
G36-14 (TR) - G36-1 (SG-1)	GR - LG	Cooler (room temp. sensor) thermistor signal	Engine switch on (IG) Cabin temperature: 25°C (77°F)	1.05 to 1.45 V
G36-14 (TR) - G36-1 (SG-1)	GR - LG	Cooler (room temp. sensor) thermistor signal	Engine switch on (IG) Cabin temperature: 40°C (104°F)	0.64 to 0.87 V
G36-20 (ECOS) - G35-4 (GND)	W - W-B	ECO switch assembly (electric parking brake switch assembly) signal	Engine switch on (IG) ECO switch assembly (electric parking brake switch assembly): Off	11 to 14 V
G36-20 (ECOS) - G35-4 (GND)	W - W-B		Engine switch on (IG) ECO switch assembly (electric parking brake switch assembly): On	Below 1 V
G36-21 (LOCK) - G36-2 (SG-2)	B - W	A/C lock sensor signal	Engine running Blower switch: LO A/C switch: On	Pulse generation (See waveform 1)
G36-24 (PRE) - G36-3 (SG-4)	W - L	Air conditioner pressure sensor signal	Engine running Air conditioning system operating Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.8 kgf/cm2, 439 psi))	4.61 V or higher
			Engine running Air conditioning system operating Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm2, 26 psi))	Below 0.74 V
			Engine running Air conditioning system operating Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 26 psi))	0.74 to 4.61 V
G35-1 (B) - G35-4 (GND)	LA-B - W-B	Power source (Back-up)	Always	11 to 14 V
G35-2 (IG+) - G35-4 (GND)	LA-GR - W-B	Power source (IG)	Engine switch on (IG)	11 to 14 V
G35-2 (IG+) - G35-4 (GND)	LA-GR - W-B	Power source (IG)	Engine switch off	Below 1 V
G35-3 (SOL+) - G35-4 (GND)	R - W-B	Compressor solenoid operation signal	Engine running Blower switch: LO A/C switch: On	Pulse generation (See waveform 2)
G35-4 (GND) - Body ground	W-B - Body ground	Ground for main power supply	Always	Below 1 V
G35-6 (BLW) - G35-4 (GND)	LG - W-B	Blower motor speed control signal	Engine switch on (IG) Blower switch: LO	Pulse generation (See waveform 3)
G35-11 (CANH) - G35-12 (CANL)	SB - W	CAN communication system	CAN communication is performed	Pulse generation
G35-14 (LIN1) - G35-4 (GND)	LG - W-B	LIN communication signal	Engine switch on (IG)	Pulse generation (See waveform 4)
z8-2 (BUS G) - Body ground	B - Body ground	Ground for BUS IC	Always	Below 1 V
z8-3 (BUS) - z8-2 (BUS G)	L - B	BUS IC control signal	Engine switch on (IG)	Pulse generation (See waveform 5)
z8-4 (B BUS) - z8-2 (BUS G)	R - B	Power supply for BUS IC	Engine switch off	11 to 14 V
z8-5 (SGA) - Body ground	GR - Body ground	Ground for No. 1 cooler thermistor	Always	Below 1 V
z8-6 (TEA) - z8-5 (SGA)	GR - GR	No. 1 cooler thermistor signal	Engine switch on (IG) Evaporator temperature: 0°C (32°F)	1.7 to 2.1 V
z8-6 (TEA) - z8-5 (SGA)	GR - GR	No. 1 cooler thermistor signal	Engine switch on (IG) Evaporator temperature: 15°C (59°F)	0.9 to 1.3 V

(a) Waveform 1:

Item	Content
Terminal No.	G36-21 (LOCK) - G36-2 (SG-2)
Tool Setting	200 mV/DIV., 10 ms./DIV.
Condition	Engine running Blower switch: LO A/C switch: On

(b) Waveform 2:

Item	Content
Terminal No.	G35-3 (SOL+) - G35-4 (GND)
Tool Setting	5 V/DIV., 500 μs./DIV.
Condition	Engine running Blower switch: LO A/C switch: On

Item	Content
Terminal No.	G35-6 (BLW) - G35-4 (GND)
Tool Setting	2 V/DIV., 1 ms./DIV.
Condition	Engine switch on (IG) Blower switch: LO

(d) Waveform 4:

Item	Content
Terminal No.	G35-14 (LIN1) - G35-4 (GND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch on (IG)

(e) Waveform 5:

Item	Content
Terminal No.	z8-3 (BUS) - z8-2 (BUS G)
Tool Setting	2 V/DIV., 2 ms./DIV.
Condition	Engine switch on (IG)

CHECK AIR CONDITIONING CONTROL PANEL (RADIO AND DISPLAY RECEIVER ASSEMBLY)

HINT:

Check from the rear of the connector while it is connected to the air conditioning control assembly.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G20-2 (IG+) - G20-6 (GND)	GR - W-B	Power source (IG)	Engine switch off	Below 1 V
G20-2 (IG+) - G20-6 (GND)	GR - W-B	Power source (IG)	Engine switch on (IG)	11 to 14 V
G20-3 (+B) - G20-6 (GND)	L - W-B	Power source (Back-up)	Engine switch off	11 to 14 V
G20-6 (GND) - Body ground	W-B - Body ground	Ground for air conditioning control panel (radio and display receiver assembly)	Always	Below 1 V
G20-8 (LIN1) - Body ground	LG - Body ground	LIN communication signal	Engine switch on (IG)	Pulse generation (See waveform)
G20-10 (ACC) - G20-6 (GND)	P - W-B	Power source (ACC)	Engine switch off	Below 1 V
G20-10 (ACC) - G20-6 (GND)	P - W-B	Power source (ACC)	Engine switch ACC	11 to 14 V
G20-11 (ILL+) - Body ground	W - Body ground	Illumination signal	Taillight off	Below 1 V
G20-11 (ILL+) - Body ground	W - Body ground	Illumination signal	Taillight on	11 to 14 V
G20-15 (ILL-) - Body ground	B - Body ground	Illumination signal	Always	Below 1 V

(a) Waveform:

Item	Content
Terminal No.	G20-8 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch on (IG)

Lost Communication With ECM/PCM "A" (U0100-U0142,U0151,U0155,U0163)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
U0100	Lost Communication With ECM/PCM "A"	No communication with ECM	CAN communication system ECM	Memorized
U0131	Lost Communication With Power Steering Control Module	No communication with power steering ECU (rack and pinion power steering gear assembly)	CAN communication system Power steering ECU (rack and pinion power steering gear assembly)	Memorized
U0142	Lost Communication With Body Control Module "B"	No communication with main body ECU (multiplex network body ECU)	CAN communication system Main body ECU (multiplex network body ECU)	Memorized
U0151	Lost Communication With Restraints Control Module	No communication with airbag ECU assembly	CAN communication system Airbag ECU assembly	Memorized
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	No communication with combination meter assembly	CAN communication system Combination meter assembly	Memorized
U0163	Lost Communication With Navigation Control Module	No communication with air conditioning control panel (radio and display receiver assembly)	CAN communication system Air conditioning control panel (radio and display receiver assembly)	Memorized

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

HINT:

Refer to CAN Communication System.

Click here

END

Utility

UTILITY

REFRIGERANT HIGH PRESSURE HISTORY CLEAR

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant High Pressure History Clear.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant High Pressure History Clear

REFRIGERANT SHORTAGE CHECK USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item	Condition
A/C switch	On
Ambient temperature*	0 to 49°C (32 to 120°F)
Blower speed	HI

*: If the ambient temperature is not within the range shown, do not perform this check.

HINT:

Refer to the Techstream operator's manual for further details.
A message indicating a refrigerant shortage is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient.
DTCs are not stored when performing the refrigerant shortage check using the Techstream.

Result:

Result	Amount of Refrigerant	Corrective Action
Refrigerant shortage	Insufficient	Check for refrigerant leaks using a halogen leak detector, and repair if necessary. Evacuate the air conditioning system and charge it with the appropriate volume of new or purified refrigerant. Click here
Refrigerant correct	Correct	-

Weak Blower Output

DESCRIPTION

If the airflow from the front registers is weak regardless of the blower speed setting displayed on the air conditioning control panel (radio and display receiver assembly), the following factors may be the cause.

Symptom	Factor
Airflow volume is constantly low Airflow volume sometimes becomes low	Blower motor with fan sub-assembly malfunction ECO mode control of air conditioning system is enabled Clogged clean air filter Clogged No. 1 cooler evaporator sub-assembly or heater radiator unit sub-assembly fins No. 1 cooler thermistor malfunction Aspirator not connected properly

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM

(a) Operate the blower switch with the following conditions met and check that the airflow volume changes.

Blower Speed	Condition
LO → HI	Temperature setting: MAX COLD Air outlet mode: FACE A/C switch: Off

OK:

Airflow volume increases.

GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit)

2.	CHECK ECO MODE SETTING

(a) Check if the ECO mode indicator is off.

OK:

The ECO mode indicator is off.

GO TO STEP 4

3.	CHECK ECO MODE CONTROL OPERATION

(a) Operate the ECO switch assembly (electric parking brake switch assembly) and check that the ECO mode indicator turns off and the blower speed reduction is canceled.

HINT:

Control	Outline
Blower Control	When the air conditioning system is in AUTO mode, the blower speed will be reduced to a certain speed. Additionally, if warm-up control is operating, the blower speed will be further reduced.
Air Inlet Control	If the ambient temperature is a certain value or more, the air inlet mode will be changed to recirculation mode.

In some situations, ECO mode control may not operate even though it is enabled.

Result	Proceed to
ECO mode indicator turns off and blower speed reduction is canceled	A
ECO mode indicator turns off, but the blower speed reduction is not canceled	B
ECO mode indicator does not turn off	B

GO TO ECO Switch Circuit

4.	CHECK CLEAN AIR FILTER

(a) Visually check the clean air filter.

Click here

OK:

The clean air filter is not dirty or clogged.

REPLACE CLEAN AIR FILTER

5.	CHECK NO. 1 COOLER THERMISTOR

(a) Check the installation condition of the No. 1 cooler thermistor.

OK:

The No. 1 cooler thermistor is installed correctly.

INSTALL NO. 1 COOLER THERMISTOR CORRECTLY

6.	CHECK ASPIRATOR

(a) Check the installation condition of the aspirator.

OK:

The aspirator is installed correctly.

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY

INSTALL ASPIRATOR CORRECTLY

Air Conditioning Pressure Sensor

Air Conditioning Unit(for 2gr-fks)

See More:

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