Toyota Avalon (XX50): Vehicle Speed Signal Malfunction (B2282,B2283). Brake Signal Malfunction (B2284). Steering Lock Position Signal Circuit Malfunction (B2285)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function, Gasoline Model) / Vehicle Speed Signal Malfunction (B2282,B2283). Brake Signal Malfunction (B2284). Steering Lock Position Signal Circuit Malfunction (B2285)

Vehicle Speed Signal Malfunction (B2282,B2283)

DESCRIPTION

DTC B2282 is stored when the vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match.

DTC B2283 is stored when a malfunction in the vehicle speed sensor is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2282	Vehicle Speed Signal Malfunction	The vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match. (1-trip detection logic*)	Meter/gauge system Certification ECU (smart key ECU assembly) Wire harness or connector	Drive the vehicle at a vehicle speed of 25 km/h (16 mph) or more for 20 seconds, and then drive the vehicle at a vehicle speed of less than 5 km/h (3 mph) for 20 seconds.
B2283	Vehicle Speed Sensor Malfunction	Either of the of the following malfunctions is detected (a vehicle speed sensor malfunction is detected) (1-trip detection logic*): Vehicle speed signal malfunction detection 1: Excessive deceleration is detected Vehicle speed signal malfunction detection 2: Engine speed linked malfunction detected	Meter/gauge system Certification ECU (smart key ECU assembly) Wire harness or connector	DTC Output Confirmation Operation: Run the engine at an engine speed of 2000 rpm or more for 300 seconds. Drive the vehicle at a vehicle speed of 50 km/h (31 mph) or more for 10 seconds, and then drive the vehicle at a vehicle speed of less than 50 km/h (31 mph).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2282

Vehicle Speed Signal Malfunction

The vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match. (1-trip detection logic*)

Meter/gauge system
Certification ECU (smart key ECU assembly)
Wire harness or connector

Drive the vehicle at a vehicle speed of 25 km/h (16 mph) or more for 20 seconds, and then drive the vehicle at a vehicle speed of less than 5 km/h (3 mph) for 20 seconds.

B2283

Vehicle Speed Sensor Malfunction

Either of the of the following malfunctions is detected (a vehicle speed sensor malfunction is detected) (1-trip detection logic*):

Vehicle speed signal malfunction detection 1: Excessive deceleration is detected
Vehicle speed signal malfunction detection 2: Engine speed linked malfunction detected

Meter/gauge system
Certification ECU (smart key ECU assembly)
Wire harness or connector

DTC Output Confirmation Operation:

Run the engine at an engine speed of 2000 rpm or more for 300 seconds.
Drive the vehicle at a vehicle speed of 50 km/h (31 mph) or more for 10 seconds, and then drive the vehicle at a vehicle speed of less than 50 km/h (31 mph).

*: Only detected while a malfunction is present and the engine switch is on (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected

DTC Code	Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
B2282	When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle speed is 0 km/h (0 mph), there is no effect on vehicle behavior. When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle is moving, the engine switch cannot be turned from on (IG) to off.	-
B2283	The power source mode is changed to off (the engine is stopped) by pressing the engine switch while the vehicle is being driven. With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine will not start.	Steering lock motor operation is prohibited.

Related Data List and Active Test Items

DTC No.	Data List and Active Test
B2282 B2283	Power Source Control Vehicle Speed Signal Engine Condition Power Supply Condition Starting Control Engine Speed Combination Meter Vehicle Speed Meter

DTC No.

Data List and Active Test

B2282

B2283

Power Source Control

Vehicle Speed Signal
Engine Condition
Power Supply Condition

Starting Control

Engine Speed

Combination Meter

Vehicle Speed Meter

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function, Gasoline Model) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function, Gasoline Model) after confirming that the communication systems are functioning properly.
Click here
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.	READ VALUE USING TECHSTREAM (VEHICLE SPEED METER)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

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

Body Electrical > Combination Meter > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Vehicle Speed Meter	Vehicle speed	Min.: 0, Max.: 255	Almost same as actual vehicle speed (Speedometer tester)	-

Body Electrical > Combination Meter > Data List

Tester Display
Vehicle Speed Meter

HINT:

Using a speedometer tester, check the actual vehicle speed and the vehicle speed displayed on the Techstream.

OK:

Vehicle speed displayed on the Techstream is almost the same as the actual vehicle speed measured using a speedometer tester.

GO TO METER / GAUGE SYSTEM (Speedometer Malfunction)

2.	READ VALUE USING TECHSTREAM (VEHICLE SPEED SIGNAL)

(a) Enter the following menus: Body Electrical / Power Source Control / Data List.

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

Body Electrical > Power Source Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Vehicle Speed Signal	Vehicle being driven or stopped	Stop or Run	Stop: Vehicle stopped Run: Vehicle being driven at 5 km/h (3 mph) or more	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Speed Signal

Vehicle being driven or stopped

Stop or Run

Stop: Vehicle stopped

Run: Vehicle being driven at 5 km/h (3 mph) or more

Body Electrical > Power Source Control > Data List

Tester Display
Vehicle Speed Signal

OK:

The Techstream display changes correctly in response to the vehicle condition.

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

3.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY)

(a) Disconnect the G16 combination meter assembly connector.

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

(d) Disconnect the G3 radio and display receiver assembly connector.

(e) Disconnect the G9 DCM (telematics transceiver) connector.*1

(f) Disconnect the G8 stereo component amplifier assembly.*2

(g) Disconnect the G13 navigation ECU.*3

*1: w/ Manual (SOS) Switch
*2: for 14 Speakers
*3: w/ Navigation System

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G40-19 (SPD) - G16-6 (+S)	Always	Below 1 Ω
G40-19 (SPD) or G16-6 (+S) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

(b) Connect the G16 combination meter assembly connector.

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

Tester Connection	Condition	Tool Setting	Specified Condition
G40-19 (SPD) - G40-18 (E)	Engine switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)	5 V/DIV., 20 ms./DIV.	Pulse generation

HINT:

The wavelength becomes shorter as the vehicle speed increases.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

GO TO METER / GAUGE SYSTEM (Speed Signal Circuit)

Brake Signal Malfunction (B2284)

DESCRIPTION

This DTC is stored when the brake signal sent via direct line and the brake signal sent via CAN communication do not match.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2284	Brake Signal Malfunction	The brake signal sent via direct line and the brake signal sent via CAN communication do not match. (1-trip detection logic*)	Stop light switch assembly SFI system Certification ECU (smart key ECU assembly) Wire harness or connector	Connect the cable to the negative (-) battery terminal, release the brake pedal and wait at least 20 seconds. Then depress the brake pedal for 20 seconds or more.

*: Only detected while a malfunction is present and the engine switch is on (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine does not start (the key indicator display is not displayed on the multi-information display). However, the engine can be started by turning the engine switch on (ACC) and then pressing and holding it. If there is a malfunction when the brake signal sent via direct line is on, the engine can be started by pressing the engine switch with the brake pedal released. If there is a malfunction when the brake signal sent via direct line is off, the engine cannot be started by pressing the engine switch with the brake pedal depressed.	-

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine does not start (the key indicator display is not displayed on the multi-information display). However, the engine can be started by turning the engine switch on (ACC) and then pressing and holding it.

If there is a malfunction when the brake signal sent via direct line is on, the engine can be started by pressing the engine switch with the brake pedal released.
If there is a malfunction when the brake signal sent via direct line is off, the engine cannot be started by pressing the engine switch with the brake pedal depressed.

Related Data List and Active Test Items

DTC No.	Data List and Active Test
B2284	Power Source Control Stop Light Switch1 Engine Stop Light SW

DTC No.

Data List and Active Test

B2284

Power Source Control

Stop Light Switch1

Engine

Stop Light SW

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function, Gasoline Model) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function, Gasoline Model) after confirming that the communication systems are functioning properly.
Click here
Inspect the fuses of circuits related to this system before performing the following procedure.
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.	READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH1)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

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

Body Electrical > Power Source Control > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Stop Light Switch1	State of brake pedal	OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	Use this item to determine if the stop light switch assembly is malfunctioning. The engine cannot be started when this item is OFF. If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Switch1

State of brake pedal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed

Use this item to determine if the stop light switch assembly is malfunctioning.
The engine cannot be started when this item is OFF.
If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

Body Electrical > Power Source Control > Data List

Tester Display
Stop Light Switch1

OK:

The Techstream display changes correctly in response to the brake pedal operation.

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A33 stop light switch assembly connector.

(d) Disconnect the A28 skid control ECU (brake actuator assembly) connector.

(e) Disconnect the G21 shift lock control unit assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K10-25 (STP1) - A33-3 (L)	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Connect the K10 certification ECU (smart key ECU assembly) connector.

(b) Connect the A33 stop light switch assembly connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
K10-25 (STP1) - Body ground	Brake pedal released → depressed	1 V or less → 9 V or higher

*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE STOP LIGHT SWITCH ASSEMBLY

Steering Lock Position Signal Circuit Malfunction (B2285)

DESCRIPTION

This DTC is stored when the steering lock position signal sent by the steering lock ECU (steering lock actuator or upper bracket assembly) via direct line and the steering lock position signal sent via LIN communication do not match.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2285	Steering Lock Position Signal Circuit Malfunction	The steering lock position signal sent by the steering lock ECU (steering lock actuator or upper bracket assembly) via direct line and the steering lock position signal sent via LIN communication do not match. (1-trip detection logic*1)	LIN communication system Steering lock ECU (steering lock actuator or upper bracket assembly) Certification ECU (smart key ECU assembly) Wire harness or connector DCM (telematics transceiver)*2	Disconnect the cable from the negative (-) battery terminal, wait 30 seconds and then reconnect the cable to the negative (-) battery terminal. Wait at least 40 seconds with the engine switch off (wait is the steering locked), then turn the engine switch on (IG) (steering unlocked) and wait at least 40 seconds.

*1: Only detected while a malfunction is present and the engine switch is on (IG).
*2: for Toyota Entune Remote Connect Compatible Type

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
The engine cannot be started.	The ECU does not send an engine start request.

Related Data List and Active Test Items

DTC No.	Data List and Active Test
B2285	Power Source Control Steering Unlock Switch Smart Key Power Supply Short Motor Driver Short Lock Bar Stuck Error

DTC No.

Data List and Active Test

B2285

Power Source Control

Steering Unlock Switch

Smart Key

Power Supply Short
Motor Driver Short
Lock Bar Stuck Error

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function, Gasoline Model) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function, Gasoline Model) after confirming that the communication systems are functioning properly.
Click here
Inspect the fuses of circuits related to this system before performing the following procedure.
Before replacing the certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator or upper bracket assembly) or DCM (telematics transceiver)*, refer to Registration.
Click here
- *: for Toyota Entune Remote Connect Compatible Type
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

HINT:

If the steering cannot be unlocked, the engine switch cannot be turned on (IG) and the engine cannot be started.
If LIN communication is not available, the steering cannot be locked or unlocked.

OK:

LIN communication system DTC B2785 is not output simultaneously.

GO TO DTC B2785

2.	READ VALUE USING TECHSTREAM (STEERING UNLOCK SWITCH)

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

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

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Steering Unlock Switch

State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or upper bracket assembly)

OFF or ON

OFF: Steering locked

ON: Steering unlocked

When the shift lever is in P and the engine switch is off, if any door is opened or closed, the steering is locked.
When the electrical key transmitter sub-assembly is in the cabin and the engine switch is turned on (ACC) or on (IG), the steering unlocks.
The engine cannot be started when the steering unlock signal is off.

Body Electrical > Power Source Control > Data List

Tester Display
Steering Unlock Switch

OK:

The Techstream display changes.

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

3.	CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G43-4 (SLP1) - Body ground

Positive (+) tester probe → G43-4 (SLP1)

Negative (-) tester probe → Body ground

Steering locked → unlocked*

10 kΩ or higher → Below 1 Ω

HINT:

*: If any of the doors are opened with the shift lever in P and the engine switch off, the steering will be locked. If the engine switch is turned on (ACC) or on (IG) with the electrical key transmitter sub-assembly in the cabin, the steering will be unlocked.
DTC B2285 may be stored due to a malfunction in the steering lock ECU (steering lock actuator or upper bracket assembly). The steering lock position signal and unlock position signal are sent from the steering lock ECU (steering lock actuator or upper bracket assembly) to the certification ECU (smart key ECU assembly) individually.

*a	Component with harness connected (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

Result	Proceed to
OK (except Toyota Entune Remote Connect Compatible Type)	A
OK (for Toyota Entune Remote Connect Compatible Type)	B
NG	C

GO TO STEP 5

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

4.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY))

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

(b) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G40-14 (SLP) - G43-4 (SLP1)	Always	Below 1 Ω
G40-14 (SLP) or G43-4 (SLP1) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - DCM)

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

(b) Disconnect the G43 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G40-14 (SLP) - G43-4 (SLP1)	Always	Below 1 Ω
G43-4 (SLP1) - G9-29 (SLPD)	Always	Below 1 Ω
G40-14 (SLP), G43-4 (SLP1) or G9-29 (SLPD) - Other terminals and body ground	Always	10 kΩ or higher

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G40-14 (SLP), G43-4 (SLP1) or G9-29 (SLPD) - Body ground	Always	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Check the push-button start function.

(1) Enter the vehicle while carrying an electrical key transmitter sub-assembly.

(2) Depress the brake pedal with the shift lever in P.

(3) Check that the engine starts when the engine switch is pressed.

Result	Proceed to
Engine starts	A
Engine does not start	B

REPLACE DCM (TELEMATICS TRANSCEIVER)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

ACC Monitor Malfunction (B2274). Detecting Vehicle Submersion (B2277). Engine/Power Switch Malfunction (B2278)

Runnable Signal Malfunction (B2286,P0335). Engine Starter Communication Malfunction (B2779). Open / Short in Steering Lock ECU (B2781)

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electronically Controlled Brake System(for Hv Model): Freeze Frame Data
FREEZE FRAME DATA FREEZE FRAME DATA/INFORMATION (a) Using the Techstream, check the vehicle condition (ECU, sensor) when the brake system operates or a DTC is output. (b) The Freeze Frame Data that is recorded when a DTC is stored can be used to check the INF codes, but only for DTCs which can be st ...