Toyota Avalon (XX50): Lighting System(for Gasoline Model)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Lighting (int) / Lighting System(for Gasoline Model)

ACC Signal Circuit

DESCRIPTION

This circuit detects the engine switch on (ACC) or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
First, check for smart key system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ACC SW

Engine switch on (ACC) signal

OFF or ON

OFF: Engine switch off

ON: Engine switch on (ACC)

"ON" is also displayed for this item when the engine switch is on (IG).

Body Electrical > Main Body > Data List

Tester Display
ACC SW

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the 4K and 4D instrument panel junction block assembly connectors.

(b) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
4K-1 - Body ground	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-3 - Body ground	Always	Below 1 Ω
G32-19 (GND2) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected (Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4K-1 - MB-30 (ACC)	Battery not connected to 4A-30 and 4D-3	10 kΩ or higher
4K-1 - MB-30 (ACC)	Battery positive (+) → 4A-30 Battery negative (-) → 4D-3	Below 1 Ω

Tester Connection

Condition

Specified Condition

4K-1 - MB-30 (ACC)

Battery not connected to 4A-30 and 4D-3

10 kΩ or higher

4K-1 - MB-30 (ACC)

Battery positive (+) → 4A-30

Battery negative (-) → 4D-3

Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Ambient Illumination Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:

Front Door Inside Handle Illumination Light Assembly LH
Front Door Inside Handle Illumination Light Assembly RH
Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)
Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)
Cup Holder Light (for Front Side) (No. 4 Interior Illumination Light Sub-assembly)
Cup Holder Light (for Rear Side) (No. 4 Interior Illumination Light Sub-assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

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 / Main Body / Active Test.

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

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Fr Foot Light	Front door inside handle illumination light assembly Center console light (for passenger side) (No. 2 interior illumination light sub-assembly) Center console light (for driver side) (No. 3 interior illumination light sub-assembly) Cup holder light (No. 4 interior illumination light sub-assembly)	OFF or ON	Preconditions for using the Active Test to check dimmer controlled illumination: Engine switch on (IG) Ambient illumination lights turned off using the mood switch

Tester Display

Measurement Item

Control Range

Diagnostic Note

Fr Foot Light

Front door inside handle illumination light assembly
Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)
Center console light (for driver side) (No. 3 interior illumination light sub-assembly)
Cup holder light (No. 4 interior illumination light sub-assembly)

OFF or ON

Preconditions for using the Active Test to check dimmer controlled illumination:

Engine switch on (IG)
Ambient illumination lights turned off using the mood switch

Body Electrical > Main Body > Active Test

Tester Display
Fr Foot Light

OK:

Front door inside handle illumination lights, center console lights and cup holder lights come on.

Result	Proceed to
OK	A
NG (Front door inside handle illumination light LH does not come on)	B
NG (Front door inside handle illumination light RH does not come on)	C
NG (Center console light (for passenger side) does not come on)	D
NG (Center console light (for driver side) does not come on)	E
NG (Cup holder light (for front side) does not come on)	F
NG (Cup holder light (for rear side) does not come on)	G
NG (Front door inside handle illumination lights, center console lights and cup holder lights do not come on)	H

USE SIMULATION METHOD TO CHECK

GO TO STEP 4

GO TO STEP 6

GO TO STEP 8

GO TO STEP 10

GO TO STEP 12

GO TO STEP 14

2.	INSPECT FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH

(a) Remove the front door inside handle illumination light assembly LH.

Click here

(b) Inspect the front door inside handle illumination light assembly LH.

Click here

REPLACE FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH

3.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH)

(a) Disconnect the 4A and 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - I26-1 (+)	Always	Below 1 Ω
4A-36 - I26-2 (-)	Always	Below 1 Ω

USE SIMULATION METHOD TO CHECK

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH

(a) Remove the front door inside handle illumination light assembly RH.

Click here

(b) Inspect the front door inside handle illumination light assembly RH.

Click here

REPLACE FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH

5.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH)

(a) Disconnect the 4A and 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - I10-1 (+)	Always	Below 1 Ω
4A-36 - I10-2 (-)	Always	Below 1 Ω

USE SIMULATION METHOD TO CHECK

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT CENTER CONSOLE LIGHT (for Passenger Side) (NO. 2 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

(a) Remove the center console light (for passenger side) (No. 2 interior illumination light sub-assembly).

Click here

(b) Inspect the center console light (for passenger side) (No. 2 interior illumination light sub-assembly).

Click here

REPLACE CENTER CONSOLE LIGHT (for Passenger Side) (NO. 2 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

7.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CENTER CONSOLE LIGHT (for Passenger Side))

(a) Disconnect the 4A and 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - G67-1 (+)	Always	Below 1 Ω
4A-36 - G67-2 (-)	Always	Below 1 Ω

USE SIMULATION METHOD TO CHECK

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT CENTER CONSOLE LIGHT (for Driver Side) (NO. 3 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

(a) Remove the center console light (for driver side) (No. 3 interior illumination light sub-assembly).

Click here

(b) Inspect the center console light (for driver side) (No. 3 interior illumination light sub-assembly).

Click here

REPLACE CENTER CONSOLE LIGHT (for Driver Side) (NO. 3 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

9.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CENTER CONSOLE LIGHT (for Driver Side))

(a) Disconnect the 4A and 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - G66-1 (+)	Always	Below 1 Ω
4A-36 - G66-2 (-)	Always	Below 1 Ω

USE SIMULATION METHOD TO CHECK

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT CUP HOLDER LIGHT (for Front Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

(a) Remove the cup holder light (for front side) (No. 4 interior illumination light sub-assembly).

Click here

(b) Inspect the cup holder light (for front side) (No. 4 interior illumination light sub-assembly).

Click here

REPLACE CUP HOLDER LIGHT (for Front Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

11.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CUP HOLDER LIGHT (for Front Side))

(a) Disconnect the 4A and 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - G64-1 (+)	Always	Below 1 Ω
4A-36 - G64-2 (-)	Always	Below 1 Ω

USE SIMULATION METHOD TO CHECK

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	INSPECT CUP HOLDER LIGHT (for Rear Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

(a) Remove the cup holder light (for rear side) (No. 4 interior illumination light sub-assembly).

Click here

(b) Inspect the cup holder light (for rear side) (No. 4 interior illumination light sub-assembly).

Click here

REPLACE CUP HOLDER LIGHT (for Rear Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)

13.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CUP HOLDER LIGHT (for Rear Side))

(a) Disconnect the 4A and 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - G65-1 (+)	Always	Below 1 Ω
4A-36 - G65-2 (-)	Always	Below 1 Ω

USE SIMULATION METHOD TO CHECK

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4K instrument panel junction block assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
4K-1 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.	CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - 4K-1	Always	Below 1 Ω

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

16.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AMBIENT ILLUMINATION LIGHT)

(a) Disconnect the I26 front door inside handle illumination light assembly LH connector.

(b) Disconnect the I10 front door inside handle illumination light assembly RH connector.

(c) Disconnect the G67 center console light (for passenger side) (No. 2 interior illumination light sub-assembly) connector.

(d) Disconnect the G66 center console light (for driver side) (No. 3 interior illumination light sub-assembly) connector.

(e) Disconnect the G64 cup holder light (for front side) (No. 4 interior illumination light sub-assembly) connector.

(f) Disconnect the G65 cup holder light (for rear side) (No. 4 interior illumination light sub-assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-24 - I26-1 (+)	Always	Below 1 Ω
4D-24 - I10-1 (+)	Always	Below 1 Ω
4D-24 - G64-1 (+)	Always	Below 1 Ω
4D-24 - G65-1 (+)	Always	Below 1 Ω
4D-24 - G66-1 (+)	Always	Below 1 Ω
4D-24 - G67-1 (+)	Always	Below 1 Ω
4A-36 - I26-2 (-)	Always	Below 1 Ω
4A-36 - I10-2 (-)	Always	Below 1 Ω
4A-36 - G64-2 (-)	Always	Below 1 Ω
4A-36 - G65-2 (-)	Always	Below 1 Ω
4A-36 - G66-2 (-)	Always	Below 1 Ω
4A-36 - G67-2 (-)	Always	Below 1 Ω
4D-24, I26-1 (+), I10-1 (+), G64-1 (+), G65-1 (+), G66-1 (+) or G67-1 (+) - Body ground	Always	10 kΩ or higher
4A-36, I26-2 (-), I10-2 (-), G64-2 (-), G65-2 (-), G66-2 (-) or G67-2 (-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4A-36 - MB-26 (FSPT)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Ambient Light Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the mood switch on the roof console box sub-assembly using this circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ceiling Light SW

Mood switch signal

OFF or ON

OFF: Mood switch not pressed

ON: Mood switch pressed

Body Electrical > Main Body > Data List

Tester Display
Ceiling Light SW

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Remove the mood switch (roof console box sub-assembly).

Click here

(b) Inspect the mood switch (roof console box sub-assembly).

Click here

REPLACE MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY)

3.	CHECK HARNESS AND CONNECTOR (MOOD SWITCH (ROOF CONSOLE BOX SUB-ASSEMBLY) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O10-27 (+B2) - G33-14 (ILSW)	Always	Below 1 Ω
O10-27 (+B2) or G33-14 (ILSW) - Body ground	Always	10 kΩ or higher
O10-15 (GND) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Customize Parameters

CUSTOMIZE PARAMETERS

CUSTOMIZE LIGHTING SYSTEM (INT)

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.

(a) Customizing using the Techstream

(1) Connect the Techstream to the DLC3.

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

(3) Turn the Techstream on.

(4) Enter the following menus: Customize Setting / Illuminated Entry.

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

Illuminated Entry

Tester Display	Description	Default	Setting	ECU
Lighting Time	Changes the lighting time of the following lights that are operated by the timer function when the door linked switch of the map light (roof console box sub-assembly) is on: Map light (Roof console box sub-assembly) Spot light assembly Front door inside handle illumination light assembly1 Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)1 Center console light (for driver side) (No. 3 interior illumination light sub-assembly)1 Cup holder light (No. 4 interior illumination light sub-assembly)1	15 s	10:30 s,00:15 s,01:7.5 s	Main body ECU (Multiplex network body ECU)
I/L when ACC OFF	Lights up the following lights automatically when the door linked switch of the map light (roof console box sub-assembly) is on and the engine switch is turned from on (ACC) or on (IG) to off: Map light (Roof console box sub-assembly) Spot light assembly Front door inside handle illumination light assembly1 Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)1 Center console light (for driver side) (No. 3 interior illumination light sub-assembly)1 Cup holder light (No. 4 interior illumination light sub-assembly)1	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
I/L ON W/Door Key Unlock	Lights up the following lights automatically when the door linked switch of the map light (roof console box sub-assembly) is on and the doors are unlocked by an unlock operation: Map light (Roof console box sub-assembly) Spot light assembly Front door inside handle illumination light assembly1 Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)1 Center console light (for driver side) (No. 3 interior illumination light sub-assembly)1 Cup holder light (No. 4 interior illumination light sub-assembly)1	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Room Light when Aprchd	Lights up the following lights when the door linked switch of the map light (roof console box sub-assembly) is on and the electrical key transmitter sub-assembly is brought near the vehicle: Map light (Roof console box sub-assembly) Spot light assembly	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Light Control	Dims the lights when the engine switch is on (IG) and the shift lever is moved to any position other than P*2	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Interior Light Control	Lights up the following lights: Map light (Roof console box sub-assembly) Spot light assembly Front door inside handle illumination light assembly1 Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)1 Center console light (for driver side) (No. 3 interior illumination light sub-assembly)1 Cup holder light (No. 4 interior illumination light sub-assembly)1	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Interior Illumination Light	Turns on the following lights: Front door inside handle illumination light assembly1 Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)1 Center console light (for driver side) (No. 3 interior illumination light sub-assembly)1 Cup holder light (No. 4 interior illumination light sub-assembly)1	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)

*1: w/ Mood Switch
*2: Although this item is displayed on the Techstream, it is not applicable to this vehicle.

(b) Customizing with the multi-display

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

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

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

Display

Default

Content

Setting

Relevant ECU

Interior Lights Auto-off Timer

15 sec.

Changes the lighting time of the following lights that are operated by the timer function when the door linked switch of the map light (roof console box sub-assembly) is on:

Map light (Roof console box sub-assembly)
Spot light assembly
Front door inside handle illumination light assembly*
Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)*
Center console light (for driver side) (No. 3 interior illumination light sub-assembly)*
Cup holder light (No. 4 interior illumination light sub-assembly)*

Off, 7.5 sec., 15 sec., 30 sec.

Main body ECU (Multiplex network body ECU)

*: w/ Mood Switch

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the following table, 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: Body Electrical / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
ACC SW	Engine switch on (ACC) signal	OFF or ON	OFF: Engine switch off ON: Engine switch on (ACC)	"ON" is also displayed for this item when the engine switch is on (IG).
IG SW	Engine switch on (IG) signal	OFF or ON	OFF: Engine switch off ON: Engine switch on (IG)	"OFF" is also displayed for this item when the engine switch is on (ACC).
RR Door Courtesy SW	Rear door courtesy light switch assembly (for RH) signal	OFF or ON	OFF: Rear door RH closed ON: Rear door RH open	-
RL Door Courtesy SW	Rear door courtesy light switch assembly (for LH) signal	OFF or ON	OFF: Rear door LH closed ON: Rear door LH open	-
FR Door Lock Pos	Front door RH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door RH locked UNLOCK: Front door RH unlocked	-
FR Door Courtesy SW	Front door courtesy light switch assembly (for RH) signal	OFF or ON	OFF: Front door RH closed ON: Front door RH open	-
FL Door Lock Pos	Front door LH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door LH locked UNLOCK: Front door LH unlocked	-
FL Door Courtesy SW	Front door courtesy light switch assembly (for LH) signal	OFF or ON	OFF: Front door LH closed ON: Front door LH open	-
Ceiling Light SW	Mood switch signal*	OFF or ON	OFF: Mood switch not pressed ON: Mood switch pressed	-
RR-Door Lock Pos SW	Rear door RH unlock detection switch signal	OFF or ON	OFF: Rear door RH locked ON: Rear door RH unlocked	-
RL-Door Lock Pos SW	Rear door LH unlock detection switch signal	OFF or ON	OFF: Rear door LH locked ON: Rear door LH unlocked	-
Luggage Courtesy SW	Luggage compartment door courtesy switch signal	OFF or ON	OFF: Luggage compartment door closed ON: Luggage compartment door open	-
Interior Light Control	Operation of the illuminated entry system	OFF or ON	Customized value is displayed	-
I/L ON W/Door Key Unlock	Function that turns on the interior lights when the doors are unlocked	OFF or ON	Customized value is displayed	-
Lighting Time	Lighting time of the delay control function (illuminated entry system)	15 s, 7.5 s or 30 s	Customized value is displayed	-
Room Light when Aprchd	Function that turns on the interior lights when a key enters any actuation area	OFF or ON	Customized value is displayed	-
I/L when ACC OFF	Function that turns on the interior lights when the engine switch is turned from on (ACC) or on (IG) to off	OFF or ON	Customized value is displayed	-
Light Control	Function that dims the lights when the engine switch is on (IG) and the shift lever is moved to any position other than P	OFF or ON	Customized value is displayed	Although this item is displayed on the Techstream, it is not applicable to this vehicle.
Interior Illumination Light	Function that turns on the following lights: Front door inside handle illumination light assembly* Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)* Center console light (for driver side) (No. 3 interior illumination light sub-assembly)* Cup holder light (No. 4 interior illumination light sub-assembly)*	OFF or ON	Customized value is displayed	-

*: w/ Mood Switch

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 / (desired system) / Active Test.

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

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Illuminated Entry System

Turns on the lights that are controlled by the illuminated entry system*1

OFF or ON

Perform the Active Test with the door linked switch of the map light (roof console box sub-assembly) on and switches of the spot light assembly LH and RH off.

Fr Foot Light

Front door inside handle illumination light assembly*2
Center console light (for passenger side) (No. 2 interior illumination light sub-assembly)*2
Center console light (for driver side) (No. 3 interior illumination light sub-assembly)*2
Cup holder light (No. 4 interior illumination light sub-assembly)*2

OFF or ON

Preconditions for using the Active Test to check dimmer controlled illumination:

Engine switch on (IG)
Ambient illumination lights turned off using the mood switch

Relay for Interior Light Auto Cut Function

DOME CUT relay

OFF or ON

When performing this Active Test, turn all the interior lights on.

OFF: DOME CUT relay on (interior lights turn on)
ON: DOME CUT relay off (interior lights turn off)

*1: Refer to System Description for the lights that are controlled by the illuminated entry system.
Click here
*2: w/ Mood Switch

Body Electrical > Smart Key > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Power/Engine SW Light	Engine switch illumination	OFF or ON	-

Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

(a) Lighting system data and Diagnostic Trouble Codes (DTCs) can be read from 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 repairs.

CHECK DLC3

(a) Check the DLC3.

Click here

INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery.

Door Unlock Detection Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of each door unlock detection switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Door Lock Pos	Front door RH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door RH locked UNLOCK: Front door RH unlocked	-
FL Door Lock Pos	Front door LH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door LH locked UNLOCK: Front door LH unlocked	-
RR-Door Lock Pos SW	Rear door RH unlock detection switch signal	OFF or ON	OFF: Rear door RH locked ON: Rear door RH unlocked	-
RL-Door Lock Pos SW	Rear door LH unlock detection switch signal	OFF or ON	OFF: Rear door LH locked ON: Rear door LH unlocked	-

Body Electrical > Main Body > Data List

Tester Display
FR Door Lock Pos
FL Door Lock Pos
RR-Door Lock Pos SW
RL-Door Lock Pos SW

OK:

Normal conditions listed above are displayed.

Result	Proceed to
OK	A
NG ("FL Door Lock Pos" is not normal)	B
NG ("FR Door Lock Pos" is not normal)	C
NG ("RL-Door Lock Pos SW" is not normal)	D
NG ("RR-Door Lock Pos SW" is not normal)	E

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 5

GO TO STEP 8

GO TO STEP 11

2.	INSPECT FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH

(a) Remove the front door lock with motor assembly LH.

Click here

(b) Inspect the front door lock with motor assembly LH.

Click here

REPLACE FRONT DOOR W/MOTOR LOCK ASSEMBLY LH

3.	CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I27-8 (LSSR) - 4D-13	Always	Below 1 Ω
I27-8 (LSSR) or 4D-13 - Body ground	Always	10 kΩ or higher
I27-7 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-13 - MB-19 (LSFL)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

5.	INSPECT FRONT DOOR LOCK WITH MOTOR ASSEMBLY RH

(a) Remove the front door lock with motor assembly RH.

Click here

(b) Inspect the front door lock with motor assembly RH.

Click here

REPLACE FRONT DOOR LOCK WITH MOTOR ASSEMBLY RH

6.	CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK WITH MOTOR ASSEMBLY RH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I11-7 (LSSR) - 4D-12	Always	Below 1 Ω
I11-7 (LSSR) or 4D-12 - Body ground	Always	10 kΩ or higher
I11-8 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-12 - MB-17 (LSFR)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

8.	INSPECT REAR DOOR LOCK WITH MOTOR ASSEMBLY LH

(a) Remove the rear door lock with motor assembly LH.

Click here

(b) Inspect the rear door lock with motor assembly LH.

Click here

REPLACE REAR DOOR W/MOTOR LOCK ASSEMBLY LH

9.	CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK WITH MOTOR ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J8-6 (LSSR) - 4D-14	Always	Below 1 Ω
J8-6 (LSSR) or 4D-14 - Body ground	Always	10 kΩ or higher
J8-9 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-14 - MB-5 (LSWL)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

11.	INSPECT REAR DOOR LOCK WITH MOTOR ASSEMBLY RH

(a) Remove the rear door lock with motor assembly RH.

Click here

(b) Inspect the rear door lock with motor assembly RH.

Click here

REPLACE REAR DOOR LOCK WITH MOTOR ASSEMBLY RH

12.	CHECK HARNESS AND CONNECTOR (REAR DOOR LOCK WITH MOTOR ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J7-6 (LSSR) - G32-20 (LSWR)	Always	Below 1 Ω
J7-6 (LSSR) or G32-20 (LSWR) - Body ground	Always	10 kΩ or higher
J7-9 (E) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Engine Switch Illumination Circuit

DESCRIPTION

The illuminated entry system controls the engine switch illumination.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

Click here

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 / Smart Key / Active Test.

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

Body Electrical > Smart Key > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Power/Engine SW Light	Engine switch illumination	OFF or ON	-

Body Electrical > Smart Key > Active Test

Tester Display
Power/Engine SW Light

OK:

Engine switch illumination comes on.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT ENGINE SWITCH

(a) Remove the engine switch.

Click here

(b) Inspect the engine switch.

Click here

REPLACE ENGINE SWITCH

3.	CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G41-9 (SWIL) - G40-10 (SWIL)	Always	Below 1 Ω
G41-6 (AGND) - G40-11 (AGND)	Always	Below 1 Ω
G41-9 (SWIL) or G40-10 (SWIL) - Body ground	Always	10 kΩ or higher
G41-6 (AGND) or G40-11 (AGND) - Body ground	Always	10 kΩ or higher

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Front Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the front door courtesy light switch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Door Courtesy SW

Front door courtesy light switch assembly (for RH) signal

OFF or ON

OFF: Front door RH closed

ON: Front door RH open

FL Door Courtesy SW

Front door courtesy light switch assembly (for LH) signal

OFF or ON

OFF: Front door LH closed

ON: Front door LH open

Body Electrical > Main Body > Data List

Tester Display
FR Door Courtesy SW
FL Door Courtesy SW

OK:

Normal conditions listed above are displayed.

Result	Proceed to
OK	A
NG ("FR Door Courtesy SW" is not normal)	B
NG ("FL Door Courtesy SW" is not normal)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 4

2.	INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)

(a) Remove the front door courtesy light switch assembly (for RH).

Click here

(b) Inspect the front door courtesy light switch assembly (for RH).

Click here

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)

3.	CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K6-1 - G33-6 (FRCY)	Always	Below 1 Ω
K6-1 or G33-6 (FRCY) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)

(a) Remove the front door courtesy light switch assembly (for LH).

Click here

(b) Inspect the front door courtesy light switch assembly (for LH).

Click here

REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)

5.	CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K7-1 - G33-1 (FLCY)	Always	Below 1 Ω
K7-1 or G33-1 (FLCY) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the lighting system.
*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK

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

PRE-CHECK

(a) Measure 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 DTCs are not output	A
CAN DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

5.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

GO TO PROBLEM SYMPTOMS TABLE

6.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation Check.

Click here

(b) Terminals of ECU.

Click here

(d) Inspection.

7.	ADJUST, REPAIR OR REPLACE

8.	CONFIRMATION TEST

END

IG Signal Circuit

DESCRIPTION

This circuit detects the engine switch on (IG) or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
First, check for smart key system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.
Click here
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

IG SW

Engine switch on (IG) signal

OFF or ON

OFF: Engine switch off

ON: Engine switch on (IG)

"OFF" is also displayed for this item when the engine switch is on (ACC).

Body Electrical > Main Body > Data List

Tester Display
IG SW

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the 4K and 4D instrument panel junction block assembly connectors.

(b) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
4K-1 - Body ground	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-3 - Body ground	Always	Below 1 Ω
G32-19 (GND2) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected (Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4K-1 - MB-32 (IG)

Battery not connected to 4A-17 and 4D-3

10 kΩ or higher

4K-1 - MB-32 (IG)

Battery positive (+) → 4A-17

Battery negative (-) → 4D-3

Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Interior Light Auto Cut Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls operation of the DOME CUT relay in order to supply power to the interior lights. When the battery saving function operates while the interior lights are on, the main body ECU (multiplex network body ECU) opens the DOME CUT relay to turn off the lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

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 / Main Body / Active Test.

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

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Relay for Interior Light Auto Cut Function

DOME CUT relay

OFF or ON

When performing this Active Test, turn all the interior lights on.

OFF: DOME CUT relay on (interior lights turn on)
ON: DOME CUT relay off (interior lights turn off)

Body Electrical > Main Body > Active Test

Tester Display
Relay for Interior Light Auto Cut Function

OK:

All of the interior lights turn off when ON is selected.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4K instrument panel junction block assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
4K-1 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4H-19 - Battery negative (-)

Battery positive (+) → 4K-1

Battery negative (-) → MB-23 (DOMR)

11 to 14 V

4D-10 - Battery negative (-)

Battery positive (+) → 4K-1

Battery negative (-) → MB-23 (DOMR)

11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
4K-1 - 4H-19	Always	10 kΩ or higher
4K-1 - 4D-10	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Interior Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:

Map Light (Roof Console Box Sub-assembly)
Spot Light Assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

HINT:

The DOME CUT relay supplies power to the interior lights. If all the lights that use power from the DOME CUT relay do not turn on, check the interior light auto cut circuit first.

Click here

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 / Main Body / Active Test.

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

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Illuminated Entry System	Turns on the lights that are controlled by the illuminated entry system*	OFF or ON	Perform the Active Test with the door linked switch of the map light (roof console box sub-assembly) on and switches of the spot light assembly LH and RH off.

*: Refer to System Description for the lights that are controlled by the illuminated entry system.
Click here

Body Electrical > Main Body > Active Test

Tester Display
Illuminated Entry System

OK:

All lights that are controlled by the illuminated entry system come on.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Remove the map light (roof console box sub-assembly).

Click here

(b) Inspect the map light (roof console box sub-assembly).

Click here

REPLACE MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY)

3.	INSPECT SPOT LIGHT ASSEMBLY

(a) Remove the spot light assembly.

Click here

(b) Inspect the spot light assembly.

Click here

REPLACE SPOT LIGHT ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY) - SPOT LIGHT ASSEMBLY)

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

Standard Resistance:

w/o Sliding Roof

Tester Connection	Condition	Specified Condition
O9-10 (+B1) - O8-5 (B)	Always	Below 1 Ω
O9-2 (RLMP) - O8-2 (CTY)	Always	Below 1 Ω
O9-10 (+B1) or O8-5 (B) - Body ground	Always	10 kΩ or higher
O9-2 (RLMP) or O8-2 (CTY) - Body ground	Always	10 kΩ or higher

w/ Sliding Roof

Tester Connection	Condition	Specified Condition
O10-14 (+B1) - O8-5 (B)	Always	Below 1 Ω
O10-2 (RLMP) - O8-2 (CTY)	Always	Below 1 Ω
O10-14 (+B1) or O8-5 (B) - Body ground	Always	10 kΩ or higher
O10-2 (RLMP) or O8-2 (CTY) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - MAP LIGHT (ROOF CONSOLE BOX SUB-ASSEMBLY))

(a) Disconnect the 4D instrument panel junction block assembly connector.

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

Standard Resistance:

w/o Sliding Roof

Tester Connection	Condition	Specified Condition
4D-10 - O9-10 (+B1)	Always	Below 1 Ω
4D-29 - O9-1 (DOOR)	Always	Below 1 Ω
4D-10 or O9-10 (+B1) - Body ground	Always	10 kΩ or higher
4D-29 or O9-1 (DOOR) - Body ground	Always	10 kΩ or higher

w/ Sliding Roof

Tester Connection	Condition	Specified Condition
4D-10 - O10-14 (+B1)	Always	Below 1 Ω
4D-29 - O10-1 (DOOR)	Always	Below 1 Ω
4D-10 or O10-14 (+B1) - Body ground	Always	10 kΩ or higher
4D-29 or O10-1 (DOOR) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-29 - MB-1 (ILE)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Luggage Compartment Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives a luggage compartment door open/closed signal from luggage compartment door courtesy light switch (luggage compartment door lock assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Luggage Courtesy SW

Luggage compartment door courtesy switch signal

OFF or ON

OFF: Luggage compartment door closed

ON: Luggage compartment door open

Body Electrical > Main Body > Data List

Tester Display
Luggage Courtesy SW

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT LUGGAGE COMPARTMENT DOOR COURTESY LIGHT SWITCH (LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY)

(a) Remove the luggage compartment door courtesy light switch (luggage compartment door lock assembly).

Click here

(b) Inspect the luggage compartment door courtesy light switch (luggage compartment door lock assembly).

Click here

REPLACE LUGGAGE COMPARTMENT DOOR COURTESY LIGHT SWITCH (LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY)

3.	CHECK HARNESS AND CONNECTOR (LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4H instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
P3-3 (D+) - 4H-34	Always	Below 1 Ω
P3-3 (D+) or 4H-34 - Body ground	Always	10 kΩ or higher
P3-2 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected

(Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4H-34 - MB-4 (LGCY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Operation Check

OPERATION CHECK

INSPECT ILLUMINATED ENTRY SYSTEM OPERATION

NOTICE:

Perform this inspection with the customize parameters at the initial settings.

HINT:

Perform this inspection with the door linked switch of the map light (roof console box sub-assembly) on.

Control	Condition	Lights that Operate
Actuation Area-linked	With the engine switch off and all of the doors closed and locked, enter an exterior detection area while carrying an electrical key transmitter and check that the lights that operate turn on for approximately 15 seconds and then turn off.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly
Door Lock/Unlock-linked	With the engine switch off and all of the doors closed and locked, unlock any door using an unlock operation (key-linked, wireless or entry unlock operation) and check that the lights that operate turn on for 15 seconds and then turn off.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
Door Open/Close-linked	With the engine switch off and all of the doors closed, open any door and check that the lights that operate turn on. While the lights that operate are on, close all of the doors and check that the lights that operate turn off after approximately 15 seconds.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
	With the engine switch off and all of the doors closed, open any door and check that the light that operates turns on. While the light that operates is on, close all of the doors and check that the light that operates turns off after approximately 40 seconds.	Engine Switch Illumination
	With the engine switch on (IG), open any door and check that the lights that operate turn on. While the lights that operate are on, close all of the doors and check that the lights that operate turn off.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly
Engine Switch-linked	Turn the engine switch from on (ACC) or on (IG) to off and check that the lights that operate turn on for approximately 15 seconds and then turn off.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
Engine Switch-linked	Turn the engine switch from on (ACC) or on (IG) to off and check that the light that operates turns on for approximately 40 seconds and then turns off.	Engine Switch Illumination

*: w/ Mood Switch

INSPECT MOOD SWITCH OPERATION

(a) The operation and condition of this control are described below.

Control	Condition	Lights that Operate
Mood Switch-linked*	When the ambient illumination lights are on, and the mood switch is pressed, the ambient illumination lights dim. When the mood switch is pressed again, the lights fade out.	Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*

*: w/ Mood Switch

INSPECT BATTERY SAVING CONTROL OPERATION

(a) The operations and conditions of this control are described below.

Control

Condition

Lights that Operate

Battery Saving

When 20 minutes elapse after the engine switch is turned from on (ACC) or on (IG) to off and the lights that operate remain on, the lights are turned off.

HINT:

Battery saving control is canceled when any of the following operations is performed before the lights are turned off by battery saving control. After the operation is performed, the lights remain on for another 20 minutes and then the lights are turned off.

The engine switch is turned on (ACC) or on (IG).
Any door is opened and closed.
The luggage compartment door is opened and closed.
Any door is unlocked.
The key enters any exterior actuation area.

Engine Switch Illumination
Map Light (Roof Console Box Sub-assembly)
Spot Light Assembly
Vanity Light (Visor Assembly)
No. 1 Luggage Compartment Light Assembly
Courtesy Light Assembly
Front Footwell Light (No. 1 Interior Illumination Light Assembly)
Rear Footwell Light (No. 6 Interior Illumination Light Sub-assembly)
Front Console Light (Interior Illumination Light Sub-assembly)
Front Door Inside Handle Illumination Light Assembly*
Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)*
Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)*
Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*

*: w/ Mood Switch

Parts Location

PARTS LOCATION

ILLUSTRATION

*A	w/o Sliding Roof	*B	w/ Sliding Roof
*C	w/ Mood Switch	-	-
*1	COURTESY LIGHT ASSEMBLY LH	*2	COURTESY LIGHT ASSEMBLY RH
*3	FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY LH	*4	FRONT DOOR INSIDE HANDLE ILLUMINATION LIGHT ASSEMBLY RH
*5	NO. 1 LUGGAGE COMPARTMENT LIGHT ASSEMBLY	*6	ROOF CONSOLE BOX SUB-ASSEMBLY
*7	SPOT LIGHT ASSEMBLY	*8	DOOR INSIDE HANDLE ILLUMINATION LIGHT LH
*9	DOOR AMBIENT ILLUMINATION LIGHT LH	*10	DOOR INSIDE HANDLE ILLUMINATION LIGHT RH
*11	DOOR AMBIENT ILLUMINATION LIGHT RH	*12	MAP LIGHT
*13	MOOD SWITCH	*14	NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY - ALT FUSE

ILLUSTRATION

*1	LUGGAGE COMPARTMENT DOOR COURTESY LIGHT SWITCH (LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY)	*2	FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)
*3	FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)	*4	FRONT DOOR LOCK WITH MOTOR ASSEMBLY LH
*5	FRONT DOOR LOCK WITH MOTOR ASSEMBLY RH	*6	REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)
*7	REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)	*8	REAR DOOR LOCK WITH MOTOR ASSEMBLY LH
*9	REAR DOOR LOCK WITH MOTOR ASSEMBLY RH	*10	VANITY LIGHT (VISOR ASSEMBLY LH)
*11	VANITY LIGHT (VISOR ASSEMBLY RH)	-	-

ILLUSTRATION

*A	w/ Mood Switch	-	-
*1	CENTER CONSOLE LIGHT (for Passenger Side) (NO. 2 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)	*2	CENTER CONSOLE LIGHT (for Driver Side) (NO. 3 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)
*3	CUP HOLDER LIGHT (for Front Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)	*4	CUP HOLDER LIGHT (for Rear Side) (NO. 4 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)
*5	CONSOLE BOX LIGHT (NO. 5 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)	*6	FRONT FOOTWELL LIGHT LH (NO. 1 INTERIOR ILLUMINATION LIGHT ASSEMBLY)
*7	FRONT FOOTWELL LIGHT RH (NO. 1 INTERIOR ILLUMINATION LIGHT ASSEMBLY)	*8	REAR FOOTWELL LIGHT LH (NO. 6 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)
*9	REAR FOOTWELL LIGHT RH (NO. 6 INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)	*10	FRONT CONSOLE LIGHT (INTERIOR ILLUMINATION LIGHT SUB-ASSEMBLY)
*11	GLOVE BOX LIGHT ASSEMBLY	*12	ENGINE SWITCH
*13	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-ACC FUSE - ECU-IG1 NO. 4 FUSE - DOME FUSE - ECU-DCC NO. 2 FUSE - ACC RELAY - IG1-NO. 1 RELAY - DOME CUT RELAY	*14	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*15	CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)	*16	COMBINATION METER ASSEMBLY
*17	DLC3	-	-

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)
Pre-collision System
Intelligent Clearance Sonar System
Lighting System (for Gasoline Model with Cornering Light)
Parking Assist Monitor System
Panoramic View Monitor System

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.

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.

Map Light

Symptom	Suspected Area	Link
Map light LH or map light RH does not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
Map light LH and map light RH do not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
	Harness or connector	-
Switch illumination or shift lever illumination does not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
Switch illumination and shift lever illumination do not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
	Harness or connector	-

Room Light

Symptom	Suspected Area	Link
Spot light LH or spot light RH does not illuminate (Other interior lights are normal)	Spot light assembly
Spot light LH and spot light RH do not illuminate (Other interior lights are normal)	Spot light assembly
	Harness or connector	-

Vanity Light

Symptom	Suspected Area	Link
Vanity light LH does not illuminate	Bulb
	Visor assembly LH
	Harness or connector	-
Vanity light RH does not illuminate	Bulb
	Visor assembly RH
	Harness or connector	-

Courtesy Light

Symptom	Suspected Area	Link
Courtesy light LH does not illuminate	Bulb
	Courtesy light assembly LH
	Front door courtesy switch circuit
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)
Courtesy light RH does not illuminate	Bulb
	Courtesy light assembly RH
	Front door courtesy switch circuit
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)

Glove Box Light

Symptom	Suspected Area	Link
Glove box light does not illuminate	Glove box light assembly
Glove box light does not illuminate	Harness or connector	-

Console Box Light

Symptom	Suspected Area	Link
Console box light does not illuminate	Console box light (No. 5 interior illumination light sub-assembly)
Console box light does not illuminate	Harness or connector	-

Footwell Light and Front Console Light

Symptom	Suspected Area	Link
Front footwell light LH does not illuminate	Front footwell light LH (No. 1 interior illumination light sub-assembly)
Front footwell light LH does not illuminate	Harness or connector	-
Front footwell light RH does not illuminate	Front footwell light RH (No. 1 interior illumination light sub-assembly)
Front footwell light RH does not illuminate	Harness or connector	-
Rear footwell light LH does not illuminate.	Rear footwell light LH (No. 6 interior illumination light sub-assembly)
Rear footwell light LH does not illuminate.	Harness or connector	-
Rear footwell light RH does not illuminate	Rear footwell light RH (No. 6 interior illumination light sub-assembly)
Rear footwell light RH does not illuminate	Harness or connector	-
Front console light does not illuminate	Front console light (interior illumination light sub-assembly)
Front console light does not illuminate	Harness or connector	-
All footwell lights and front console light do not illuminate	Harness or connector	-
	Combination meter assembly

Ambient Illumination Light (w/ Mood Switch)

Symptom	Suspected Area	Link
Front door inside handle illumination light LH does not illuminate	Ambient illumination light circuit
Front door inside handle illumination light RH does not illuminate	Ambient illumination light circuit
Console light (for passenger side) does not illuminate	Ambient illumination light circuit
Console light (for driver side) does not illuminate	Ambient illumination light circuit
Cup holder light (for front side) does not illuminate	Ambient illumination light circuit
Cup holder light (for rear side) does not illuminate	Ambient illumination light circuit
All ambient illumination lights do not illuminate	Ambient illumination light circuit
	Ambient light switch circuit
	Instrument panel junction block assembly
	Main body ECU (Multiplex network body ECU)

Luggage Compartment Light

Symptom	Suspected Area	Link
Luggage compartment light does not illuminate (Other interior lights are normal)	Bulb
	No. 1 luggage compartment light assembly
	Luggage compartment door courtesy switch circuit
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)

Interior Light Power Source Control

Symptom	Suspected Area	Link
All the interior lights that receive power via the DOME CUT relay do not illuminate	Interior light auto cut circuit
	Main body ECU (Multiplex network body ECU)

Illuminated Entry System

Symptom	Suspected Area	Link
All illuminated entry system control functions do not operate under any condition	Check customize parameters (Interior Light Control)
	Interior light auto cut circuit
	Interior light circuit
	Main body ECU (Multiplex network body ECU)
Actuation area-linked control function does not operate when registered key is brought into any exterior detection area	Check customize parameters (Room Light when Aprchd)
	CAN communication system
	Smart key system (for Entry Function)
	Main body ECU (Multiplex network body ECU)
Door lock/unlock-linked control function does not operate when doors are locked/unlocked	Check customize parameters (I/L ON W/Door Key Unlock)
	Door unlock detection switch circuit
	Main body ECU (Multiplex network body ECU)
Door open/close-linked control function does not operate when doors are opened/closed	Front door courtesy switch circuit
	Rear door courtesy switch circuit
	Main body ECU (Multiplex network body ECU)
Engine switch-linked control function does not operate when engine switch is operated	Check customize parameters (I/L when ACC OFF)
	IG signal circuit
	ACC signal circuit
	Main body ECU (Multiplex network body ECU)
Engine switch illumination does not illuminate	CAN communication system
	Engine switch illumination circuit
	Certification ECU (Smart key ECU assembly)
Ambient light dimmer control does not operate with mood switch operation	Ambient light switch circuit
	Main body ECU (Multiplex network body ECU)

Battery Saving Control System

Symptom	Suspected Area	Link
Battery saving function does not operate	IG signal circuit
	ACC signal circuit
	Front door courtesy switch circuit
	Rear door courtesy switch circuit
	Luggage compartment door courtesy switch circuit
	Door unlock detection switch circuit
	Interior light auto cut circuit
	Main body ECU (Multiplex network body ECU)

Rear Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects the condition of the rear door courtesy light switch assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

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 / Main Body / Data List.

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

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

RR Door Courtesy SW

Rear door courtesy light switch assembly (for RH) signal

OFF or ON

OFF: Rear door RH closed

ON: Rear door RH open

RL Door Courtesy SW

Rear door courtesy light switch assembly (for LH) signal

OFF or ON

OFF: Rear door LH closed

ON: Rear door LH open

Body Electrical > Main Body > Data List

Tester Display
RR Door Courtesy SW
RL Door Courtesy SW

OK:

Normal conditions listed above are displayed.

Result	Proceed to
OK	A
NG ("RR Door Courtesy SW" is not normal)	B
NG ("RL Door Courtesy SW" is not normal)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 5

2.	INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)

(a) Remove the rear door courtesy light switch assembly (for RH).

Click here

(b) Inspect the rear door courtesy light switch assembly (for RH).

Click here

REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH)

3.	CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for RH) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K8-1 - 4A-31	Always	Below 1 Ω
K8-1 or 4A-31 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected (Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4A-31 - MB-2 (RCTY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

5.	INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)

(a) Remove the rear door courtesy light switch assembly (for LH).

Click here

(b) Inspect the rear door courtesy light switch assembly (for LH).

Click here

REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH)

6.	CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY (for LH) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4H instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K9-1 - 4H-24	Always	Below 1 Ω
K9-1 or 4H-24 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Component without harness connected (Instrument Panel Junction Block Assembly)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
4H-24 - MB-13 (LCTY)	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

System Description

SYSTEM DESCRIPTION

ILLUMINATED ENTRY SYSTEM

(a) The illuminated entry system has the following control functions:

Control	Outline	Lights that Operate
Actuation Area-linked	When a registered key is brought within any vehicle exterior detection area around the doors, the lights that operate turn on.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly
Door Lock/Unlock-linked	When any door is unlocked, the lights that operate turn on.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
Door Lock/Unlock-linked	When all doors are locked, the lights that operate turn off.
Door Open/Close-linked	When any door is opened, the lights that operate turn on.	Engine Switch Illumination Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
Door Open/Close-linked	When all doors are closed, the lights that operate turn off.
Engine Switch-linked	When the engine switch is turned from on (ACC) or on (IG) to off, the lights that operate turn on.	Engine Switch Illumination Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
Engine Switch-linked	When the engine switch is turned from off to on (ACC) or on (IG), the lights that operate turn off.	Engine Switch Illumination Map Light (Roof Console Box Sub-assembly) Spot Light Assembly
Delay	When approximately 15 seconds elapse after any of the following conditions is met, the lights that operate turn off: An actuation area-linked function is used. The door unlock-linked function is active. Any door is opened and then all doors are closed when the engine switch is off. The engine switch is turned from on (ACC) or on (IG) to off when all doors are closed.	Map Light (Roof Console Box Sub-assembly) Spot Light Assembly Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*
Delay	When approximately 40 seconds elapse after any of the following conditions is met, the lights that operate turn off: Any door is opened and then all doors are closed when the engine switch is off. The engine switch is turned from on (ACC) or on (IG) to off when all doors are closed.	Engine Switch Illumination

*: w/ Mood Switch

MOOD SWITCH

(a) The mood switch function has the following control functions:

Control	Condition	Lights that Operate
Mood Switch-linked*	When the ambient illumination lights are on, and the mood switch is pressed, the ambient illumination lights dim. When the mood switch is pressed again, the lights fade out.	Front Door Inside Handle Illumination Light Assembly* Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)* Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)* Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*

*: w/ Mood Switch

BATTERY SAVING CONTROL SYSTEM

(a) The battery saving function has the following control functions:

Control

Condition

Lights that Operate

Battery Saving

When 20 minutes elapse after the engine switch is turned from on (ACC) or on (IG) to off and the lights that operate remain on, the lights are turned off.

HINT:

The engine switch is turned on (ACC) or on (IG).
Any door is opened and closed.
The luggage compartment door is opened and closed.
Any door is unlocked.
The key enters any exterior actuation area.

Engine Switch Illumination
Map Light (Roof Console Box Sub-assembly)
Spot Light Assembly
Vanity Light (Visor Assembly)
No. 1 Luggage Compartment Light Assembly
Courtesy Light Assembly
Front Footwell Light (No. 1 Interior Illumination Light Assembly)
Rear Footwell Light (No. 6 Interior Illumination Light Sub-assembly)
Front Console Light (Interior Illumination Light Sub-assembly)
Front Door Inside Handle Illumination Light Assembly*
Center Console Light (for Passenger Side) (No. 2 Interior Illumination Light Sub-assembly)*
Center Console Light (for Driver Side) (No. 3 Interior Illumination Light Sub-assembly)*
Cup Holder Light (No. 4 Interior Illumination Light Sub-assembly)*

*: w/ Mood Switch

System Diagram

SYSTEM DIAGRAM

Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4D-3 - Body ground	LA - Body ground	Ground	Always	Below 1 Ω
4F-1 - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
4K-1 - Body ground	B - Body ground1 W - Body ground2	Battery power supply	Always	11 to 14 V
G32-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

*1: w/ Power Tilt and Power Telescopic
*2: w/o Power Tilt and Power Telescopic

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4A-17 - Body ground	R - Body ground	IG power supply	Engine switch on (IG)	11 to 14 V
4A-17 - Body ground	R - Body ground	IG power supply	Engine switch off	Below 1 V
4A-30 - Body ground	LG - Body ground	ACC power supply	Engine switch on (ACC)	11 to 14 V
4A-30 - Body ground	LG - Body ground	ACC power supply	Engine switch off	Below 1 V
4A-31 - Body ground	V - Body ground	Rear door courtesy light switch assembly (for RH) input	Rear door RH open	Below 1 V
4A-31 - Body ground	V - Body ground	Rear door courtesy light switch assembly (for RH) input	Rear door RH closed	11 to 14 V
4A-36 - Body ground*	SB - Body ground	Front door inside handle illumination light assembly LH and RH, center console light (for passenger side) (No. 2 interior illumination light sub-assembly), center console light (for driver side (No. 3 interior illumination light sub-assembly) and cup holder light (for front side and rear side) (No. 4 interior illumination light sub-assembly) drive output	Front door inside handle illumination light assembly LH and RH, center console light (for passenger side) (No. 2 interior illumination light sub-assembly), center console light (for driver side (No. 3 interior illumination light sub-assembly) and cup holder light (for front side and rear side) (No. 4 interior illumination light sub-assembly) off	11 to 14 V
			Front door inside handle illumination light assembly LH and RH, center console light (for passenger side) (No. 2 interior illumination light sub-assembly), center console light (for driver side (No. 3 interior illumination light sub-assembly) and cup holder light (for front side and rear side) (No. 4 interior illumination light sub-assembly) dimmer control operating (dimming)	Pulse generation
			Front door inside handle illumination light assembly LH and RH, center console light (for passenger side) (No. 2 interior illumination light sub-assembly), center console light (for driver side (No. 3 interior illumination light sub-assembly) and cup holder light (for front side and rear side) (No. 4 interior illumination light sub-assembly) at full brightness	Below 2.2 V
4D-10 - Body ground	R - Body ground	Roof console box sub-assembly, spot light assembly, vanity light (visor assembly LH), vanity light (visor assembly RH), front footwell light LH and RH (No. 1 interior illumination light assembly), rear footwell light LH and RH (No. 6 interior illumination light sub-assembly) and front console light (interior illumination light sub-assembly) power supply	DOME CUT relay on	11 to 14 V
4D-10 - Body ground	R - Body ground		DOME CUT relay off	Below 1 V
4D-12 - Body ground	GR - Body ground	Front door unlock detection switch RH input	Front door RH locked	11 to 14 V
4D-12 - Body ground	GR - Body ground	Front door unlock detection switch RH input	Front door RH unlocked	Below 1 V
4D-13 - Body ground	W - Body ground	Front door unlock detection switch LH input	Front door LH locked	11 to 14 V
4D-13 - Body ground	W - Body ground	Front door unlock detection switch LH input	Front door LH unlocked	Below 1 V
4D-14 - Body ground	GR - Body ground	Rear door unlock detection switch LH input	Rear door LH locked	11 to 14 V
4D-14 - Body ground	GR - Body ground	Rear door unlock detection switch LH input	Rear door LH unlocked	Below 1 V
4D-24 - Body ground*	LG - Body ground	Front door inside handle illumination light assembly LH and RH, center console light (for passenger side) (No. 2 interior illumination light sub-assembly), center console light (for driver side) (No. 3 interior illumination light sub-assembly) and cup holder light (for front side and rear side) (No. 4 interior illumination light sub-assembly) power supply	Always	11 to 14 V
4D-29 - Body ground	LA-G - Body ground	Illuminated entry system drive output	Map light LH and map light RH (map light (roof console box sub-assembly)) off (when operated by illuminated entry system)	11 to 14 V
4D-29 - Body ground	LA-G - Body ground	Illuminated entry system drive output	Map light LH and map light RH (map light (roof console box sub-assembly)) on (when operated by illuminated entry system)	Below 1 V
4H-19 - Body ground	LA-B - Body ground	No. 1 luggage compartment light assembly and courtesy light assembly LH and RH power supply	DOME CUT relay on	11 to 14 V
4H-19 - Body ground	LA-B - Body ground		DOME CUT relay off	Below 1 V
4H-24 - Body ground	G - Body ground	Rear door courtesy light switch assembly (for LH) input	Rear door LH open	Below 1 V
4H-24 - Body ground	G - Body ground	Rear door courtesy light switch assembly (for LH) input	Rear door LH closed	11 to 14 V
4H-34 - Body ground	LA-GR - Body ground	Luggage compartment door courtesy light switch (luggage compartment door lock assembly) input	Luggage compartment door open	Below 1 V
4H-34 - Body ground	LA-GR - Body ground		Luggage compartment door closed	11 to 14 V
G32-20 (LSWR) - Body ground	L - Body ground	Rear door unlock detection switch RH input	Rear door RH locked	11 to 14 V
G32-20 (LSWR) - Body ground	L - Body ground	Rear door unlock detection switch RH input	Rear door RH unlocked	Below 1 V
G33-1 (FLCY) - Body ground	W - Body ground	Front door courtesy light switch assembly (for LH) input	Front door LH open	Below 1 V
G33-1 (FLCY) - Body ground	W - Body ground	Front door courtesy light switch assembly (for LH) input	Front door LH closed	11 to 14 V
G33-2 (FLCL) - Body ground	G - Body ground	Courtesy light assembly LH drive output	Courtesy light assembly LH off	11 to 14 V
G33-2 (FLCL) - Body ground	G - Body ground	Courtesy light assembly LH drive output	Courtesy light assembly LH on	Below 1 V
G33-3 (FRCL) - Body ground	L - Body ground	Courtesy light assembly RH drive output	Courtesy light assembly RH off	11 to 14 V
G33-3 (FRCL) - Body ground	L - Body ground	Courtesy light assembly RH drive output	Courtesy light assembly RH on	Below 1 V
G33-6 (FRCY) - Body ground	BE - Body ground	Front door courtesy light switch assembly (for RH) input	Front door RH open	Below 1 V
G33-6 (FRCY) - Body ground	BE - Body ground	Front door courtesy light switch assembly (for RH) input	Front door RH closed	11 to 14 V
G33-14 (ILSW) - Body ground*	W - Body ground	Mood switch signal input	Mood switch off	11 to 14 V
G33-14 (ILSW) - Body ground*	W - Body ground	Mood switch signal input	Mood switch on	Below 1 V
G33-20 (TCYL) - Body ground	GR - Body ground	No. 1 luggage compartment light assembly drive output	No. 1 luggage compartment light assembly off	11 to 14 V
G33-20 (TCYL) - Body ground	GR - Body ground	No. 1 luggage compartment light assembly drive output	No. 1 luggage compartment light assembly on	Below 1 V

*: w/ Mood Switch

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
G40-10 (SWIL) - G40-11 (AGND)	W - BE	Engine switch illumination drive output	Engine switch illumination on	11 to 14 V
G40-10 (SWIL) - G40-11 (AGND)	W - BE	Engine switch illumination drive output	Engine switch illumination off	Below 1 V

Inside Handle Light

Luggage Compartment Room Light Bulb

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electronically Controlled Brake System(for Gasoline Model): Brake Warning Light does not Come ON. Brake Warning Light Remains ON. Open Circuit in ABS Motor Relay Circuit (C146C)
Brake Warning Light does not Come ON DESCRIPTION The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication. CAUTION / NOTICE / HINT NOTICE: When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acc ...