LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2785

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

DESCRIPTION

The certification ECU (smart key ECU assembly) 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 No. DTC Detection Condition Trouble Area
B2785 The certification ECU (smart key ECU assembly) detects a malfunction in the LIN communication bus between components related to certification continuously 3 times.

  • Certification ECU (smart key ECU assembly)

  • Steering lock actuator assembly

  • ID code box (immobiliser code ECU)*

  • Harness or connector

* : w/ Rear Fog Light

WIRING DIAGRAM

A005JN6E13

CAUTION / NOTICE / HINT

Note


  • If the certification ECU (smart key ECU assembly) is replaced, register the key.

  • If the steering lock actuator assembly is replaced, register the ECU code.

  • If the ID code box (immobiliser code ECU)* is replaced, register the ECU code and ECU communication ID.

  • When using the intelligent tester with the engine 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.

* : w/ Rear Fog Light

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC 2785 is output A
      DTC 2785 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - EACH ECU)


    1. Disconnect the F63 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the F61 steering lock actuator assembly connector.

    3. Disconnect the F60 ID code box (immobiliser code ECU)* connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F63-17 (LIN) - F61-5 (LIN) Always Below 1 Ω
      F63-17 (LIN) - F60-2 (LIN1)* Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F63-17 (LIN) or F61-5 (LIN) - Body ground Always 10 kΩ or higher
      F63-17 (LIN) or F60-2 (LIN1) - Body ground* Always 10 kΩ or higher

      * : w/ Rear Fog Light


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. SYSTEM CHECK


    1. Reconnect the F63 certification ECU (smart key ECU assembly) connector.

    2. Reconnect the F61 steering lock actuator assembly connector.

    3. Check the vehicle specifications.

      Result
      Result Proceed to
      w/ Rear Fog Light A
      w/o Rear Fog Light B

    B

    CLEAR DTC Click here

    A

  5. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  6. 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 (IMMOBILISER CODE ECU)

    A

  7. CLEAR DTC


    1. Reconnect the F60 ID code box (immobiliser code ECU)* connector.

    2. Disconnect the F61 steering lock actuator assembly connector.

    3. Clear the DTCs Click here.

      * : w/ Rear Fog Light


    NEXT

  8. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2785 is output A
      DTC B2785 is not output (for RHD) B
      DTC B2785 is not output (for LHD) C

    A

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY Click here

    C

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY Click here