ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2285

DTC Code DTC Name
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)

  • Harness or connector

  • DCM (telephone transceiver assembly)*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.

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 a engine start request.
Related Data List and Active Test Items
DTC No. Data List and Active Test
B2285

    Power Source Control

  • Steering Unlock Switch


    Entry&Start

  • Power Supply Short

  • Motor Driver Short

  • Lock Bar Stuck Error

WIRING DIAGRAM

B000ULXE03
*a Unlock Sensor
*b Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly)
*c Certification ECU (Smart Key ECU Assembly)
*d LIN Communication Line

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the certification ECU (smart key ECU assembly), steering lock ECU (steering lock actuator or upper bracket assembly) or telephone transceiver assembly*, refer to the Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".


  • *: for LEXUS ENFORM Remote Compatible Type

PROCEDURE


  1. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Entry&Start / Trouble Codes.

    5. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes

      Tech Tips


      • 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.

      Result
      Result Proceed to
      DTC B2785 is not output. A
      DTC B2785 is output. B

    B

    GO TO DTC B2785 Click here

    A

  2. READ VALUE USING GTS (STEERING UNLOCK SWITCH)


    1. Enter the following menus: Body Electrical / Power Source Control / Data List.

    2. Read the Data List according to the display on the GTS.


      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 state is in part (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 GTS display changes correctly in response to the steering lock/unlock status.
      Result
      Result Proceed to
      GTS display does not change A
      GTS display changes B

    B

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY) Click here

    A

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


    1. B000WTEC17
      *a

      Component with harness connected

      (Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P14-4 (SLP1) - Body ground

      Positive (+) tester probe → P14-4 (SLP1)

      Negative (-) tester probe → Body ground

      		 Steering locked → unlocked* 10 kΩ or higher → Below 1 Ω

      Tech Tips


      • *: If any of the doors are opened with the shift state park (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.

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


    1. Disconnect the P14 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

    2. Disconnect the P66 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P66-14 (SLP) - P14-4 (SLP1) Always Below 1 Ω
      P66-14 (SLP) or P14-4 (SLP1) - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P66-14 (SLP) or P14-4 (SLP1) - Body ground Always Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR