Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001R16X
Model Year Start: 2021 Model: Avalon Prod Date Range: [08/2020 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B2285; Steering Lock Position Signal Circuit Malfunction; 2021 - 2022 MY Avalon [08/2020 -        ]

DTC

B2285

Steering Lock Position Signal Circuit Malfunction

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

DTC Output Confirmation Operation:

  • 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 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

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 2019 - 2022 MY Avalon [04/2018 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • 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 2021 - 2022 MY Avalon [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

    • *: for 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.

NG

GO TO DTC B2785

OK

2.

READ VALUE USING TECHSTREAM (STEERING UNLOCK SWITCH)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(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.

OK

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

for Manual Tilt and Manual Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column): DISASSEMBLY

for Power Tilt and Power Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Power Tilt and Power Telescopic Steering Column): DISASSEMBLY

NG

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 Remote Connect Compatible Type)

A

OK (for Remote Connect Compatible Type)

B

NG

C
B

GO TO STEP 5

C

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

for Manual Tilt and Manual Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Manual Tilt and Manual Telescopic Steering Column): DISASSEMBLY

for Power Tilt and Power Telescopic Steering Column: Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY (for Power Tilt and Power Telescopic Steering Column): DISASSEMBLY

A

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.

(c) 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

G40-14 (SLP) or G43-4 (SLP1) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL

NG

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.

(c) Disconnect the G124 DCM (telematics transceiver) 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) - G124-30 (SLPD)

Always

Below 1 Ω

G40-14 (SLP), G43-4 (SLP1) or G124-30 (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 G124-30 (SLPD) - Body ground

Always

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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
A

REPLACE DCM (TELEMATICS TRANSCEIVER)

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2019 - 2021 MY Avalon Avalon HV [04/2018 - 08/2021]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL