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 ECU (steering lock actuator assembly) stops for 10 seconds or more.

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

  • Steering lock ECU (steering lock actuator assembly)

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

  • STRG LOCK fuse

WIRING DIAGRAM

A011SACE17

INSPECTION PROCEDURE

Note

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

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

  • If the steering lock ECU (steering lock actuator assembly) is replaced, register the ECU code Click here.

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

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

PROCEDURE

  1. CHECK DTC OUTPUT

    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      OK
      DTC B2786 is not output.
      Result
      Result Proceed to
      Only B2786 is output A
      DTC B2786 and B2785 are output simultaneously B

      Tech Tips

      When DTC B2786 and B2785 are output simultaneously, perform troubleshooting for DTC B2785 first.

    B

    GO TO DTC B2785 Click here

    A

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

    1. Disconnect the I24 steering lock ECU (steering lock actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I24-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      I24-7 (B) - Body ground Always 11 to 14 V
      Text in Illustration
      *a

      Component without harness connected

      (Steering Lock ECU (Steering Lock Actuator Assembly))
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Disconnect the I78 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I78-17 (LIN) - I24-5 (LIN) Always Below 1 Ω
      I78-17 (LIN) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

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

    NEXT

  5. 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) Click here

    OK

    END (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) WAS DEFECTIVE)