LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2786

DTC Code DTC Name
B2786 No Response from Steering Lock ECU

DESCRIPTION

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

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

  • Steering lock ECU (Steering lock actuator assembly)

  • Certification ECU (Smart key ECU assembly)

  • Wire harness or connector

  • STRG LCK fuse

WIRING DIAGRAM

A01CG8JE05

INSPECTION PROCEDURE

Note


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

  • If the steering lock ECU (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 tester and vehicle begins.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)


    1. Disconnect the G22 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G22-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      G22-7 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)


    1. Disconnect the G20 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G20-10 (LIN) - G22-5 (LIN) Always Below 1 Ω
      G20-10 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


    1. Replace the steering lock ECU (steering lock actuator assembly) Click here.


    NEXT

  4. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      OK
      DTC B2786 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (STEERING LOCK ECU IS DEFECTIVE)