LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2785

DTC Code DTC Name
B2785 Communication Malfunction between ECUs Connected by LIN

DESCRIPTION

The certification ECU intermittently monitors the LIN communication bus between the components related to certification. DTC B2785 is stored when a malfunction in the LIN communication bus between the components related to certification is detected continuously 3 times.

DTC Code DTC Detection Condition Trouble Area
B2785 The certification ECU detects a malfunction in the LIN communication bus between components related to certification continuously 3 times.

  • Certification ECU

  • Power management control ECU

  • ID code box

  • Steering lock actuator assembly (steering lock ECU)

  • Harness or connector

WIRING DIAGRAM

A009AN3E04

INSPECTION PROCEDURE

Note

When using the intelligent tester with the ignition switch off to troubleshoot:

Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

Tech Tips

When DTC B2785 and B2287 are output simultaneously, perform troubleshooting for DTC B2785 first.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2785 is not output.

    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the G38 certification ECU connector.

    2. Disconnect the G51 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G38-29 (LIN) - G51-24 (LIN2) Always Below 1 Ω
      G38-29 (LIN) or G51-24 (LIN2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CLEAR DTC


    1. Connect the G38 certification ECU connector.

    2. Disconnect the G51 power management control ECU connector.

    3. Clear the DTCs Click here.


    NEXT

  5. CHECK FOR DTC


    1. Check for DTCs Click here.

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

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  6. CLEAR DTC


    1. Connect the G51 power management control ECU connector.

    2. Disconnect the G35 steering lock actuator assembly (steering lock ECU) connector.

    3. Clear the DTCs Click here.


    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2785 is output A
      DTC B2785 is not output (for Power Tilt and Power Telescopic Steering Column) B
      DTC B2785 is not output (for Manual Tilt and Manual Telescopic Steering Column) C

    B

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY Click here

    C

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY Click here

    A

  8. CLEAR DTC


    1. Connect the G35 steering lock actuator assembly (steering lock ECU) connector.

    2. Disconnect the G37 ID code box connector.

    3. Clear the DTCs Click here.


    NEXT

  9. CHECK FOR DTC


    1. Check for DTCs Click here.

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

    B

    REPLACE ID CODE BOX

    A

    REPLACE CERTIFICATION ECU