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 assembly stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B2786 No communication between steering lock actuator assembly and certification ECU (smart key ECU assembly) for more than 10 seconds.

  • Steering lock actuator assembly

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

WIRING DIAGRAM

A005LU7E04

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.

  • When using the intelligent tester to troubleshoot with the engine switch off:

    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

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

Tech Tips

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTC Click here.

      Result
      Result Proceed to
      DTC B2786 is output A
      DTC B2786 and B2785 is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ACTUATOR ASSEMBLY


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

    2. Disconnect the F61 steering lock actuator assembly connector.

    3. 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
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F63-17 (LIN) or F61-5 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A005K56E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Steering Lock Actuator Assembly)

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F61-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F61-6 (IG2) - Body ground Ignition switch ON 11 to 14 V
      F61-7 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. REPLACE STEERING LOCK ACTUATOR ASSEMBLY


    1. Replace the steering lock actuator assembly.



    NEXT

  6. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      Result
      Result Proceed to
      DTC B2786 is not output A
      DTC B2786 is output B

    A

    END (STEERING LOCK ACTUATOR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)