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

DTC Code DTC Detection Condition Trouble Area
B2785 Certification ECU (smart key ECU assembly) detects malfunction in LIN communication bus between components related to certification continuously 3 times
  • Certification ECU (smart key ECU assembly)

  • ID code box (immobiliser code ECU)

  • Steering lock actuator assembly

  • Harness or connector

WIRING DIAGRAM

A003GBYE04

INSPECTION PROCEDURE

Note


  • When using the GTS with the engine switch off to troubleshoot:

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

  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart entry and start system (for Entry Function) Click here.

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 B2785 is output A
      DTC B2785 is not output B

    B
    A
  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - ID CODE BOX [IMMOBILISER CODE ECU] OR STEERING LOCK ACTUATOR ASSEMBLY)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the H81 ID code box (immobiliser code ECU) connector.

    3. Disconnect the H80 steering lock actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-5 (LIN) - H80-5 (LIN) Always Below 1 Ω
      B75-5 (LIN) - H81-2 (LIN1) Always Below 1 Ω
      B75-5 (LIN) - Body ground Always 10 kΩ or higher

    NG
    OK
  4. CLEAR DTC


    1. Disconnect the H80 steering lock actuator assembly connector.

    2. 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

    B
    A
  6. CLEAR DTC


    1. Disconnect the H81 ID code box (immobiliser code ECU) connector.

    2. 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 B

    B
    A