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 3 times consecutively.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2785

Communication Malfunction between ECUs Connected by LIN

The certification ECU detects a malfunction in the LIN communication bus between components related to certification 3 times consecutively.

  • Certification ECU (smart key ECU assembly)

  • ID code box (immobiliser code ECU)

  • Steering lock actuator assembly

  • Harness or connector

WIRING DIAGRAM

B301186E02

CAUTION / NOTICE / HINT

Note:

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

  • Connect the GTS to the vehicle, and turn a courtesy light 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) and ID code box (immobiliser code ECU), refer to the entry and start system.

    Click hereClick hereClick here

Tip:

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

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Body Electrical > Entry&Start > Trouble Codes

    Result

    Proceed to

    DTC B2785 is output

    DTC B2785 is not output
    DTC B2785 is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick hereClick hereClick here

    DTC B2785 is output

  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 G84 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the G44 ID code box (immobiliser code ECU) connector.

    3. Disconnect the G5 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

      G84-17 (LIN) - G5-5 (LIN)

      Always

      Below 1 Ω

      G84-17 (LIN) - G44-2 (LIN1)

      Always

      Below 1 Ω

      G84-17 (LIN) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CLEAR DTC

    1. Disconnect the G5 steering lock actuator assembly connector.

    2. Clear the DTCs.

      Click here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Body Electrical > Entry&Start > Trouble Codes

    Result

    Proceed to

    DTC B2785 is not output

    DTC B2785 is output
    DTC B2785 is output

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY

    Click here

    DTC B2785 is not output

  6. CLEAR DTC

    1. Disconnect the G44 ID code box (immobiliser code ECU) connector.

    2. Clear the DTCs.

      Click here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  7. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Body Electrical > Entry&Start > Trouble Codes

    Result

    Proceed to

    DTC B2785 is not output

    DTC B2785 is output
    DTC B2785 is not output

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    DTC B2785 is output

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)