LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2786

DTC Code DTC Name
B2786 No Response from Steering Lock ECU

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock actuator or upper bracket assembly stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2786 No Response from Steering Lock ECU Communication between the certification ECU (smart key ECU assembly) and steering lock actuator or upper bracket assembly stops for 10 seconds or more.

  • Certification ECU (smart key ECU assembly)

  • Steering lock actuator or upper bracket assembly

  • Harness or connector

WIRING DIAGRAM

B000VU6E04

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine 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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Before replacing the certification ECU (smart key ECU assembly) or steering lock actuator assembly, refer to the immobiliser system.

Tech Tips

When the communication between the steering lock actuator or upper bracket assembly and certification ECU (smart key ECU assembly) stops, DTC B2785 is also stored.

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 B2786 is output
      DTC B2786 is not output

    DTC B2786 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B2786 is output

  3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY - BATTERY AND BODY GROUND)

    B000Y1SC20
    *a

    Front view of wire harness connector

    (to Steering Lock Actuator or Upper Bracket Assembly)

    1. Disconnect the steering lock actuator or upper bracket assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P14-1 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P14-7 (B) - Body ground Always 11 to 14 V
      P14-6 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect the P14 steering lock actuator or upper bracket assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P14-5 (LIN) - P66-13 (LIN) Always Below 1 Ω
      P14-5 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

  5. REPLACE STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY


    1. Temporarily replace the steering lock actuator or upper bracket assembly with a new one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Proceed to
      DTC B2786 is not output
      DTC B2786 is output

    DTC B2786 is not output

    END (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY IS DEFECTIVE)

    DTC B2786 is output

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


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

    2. Disconnect the 3B driver side junction block assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      P66-13 (LIN) - 3B-27 Always Below 1 Ω
      P66-13 (LIN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      P66-13 (LIN) - 3B-17 Always Below 1 Ω
      P66-13 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


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

    2. Disconnect the 3B driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P14-5 (LIN) - 3B-15 Always Below 1 Ω
      P14-5 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR