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 and steering lock ECU stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B2786 Periodic transmission from the steering lock ECU stops for 10 seconds or more.

  • Steering lock ECU

  • Certification ECU

  • Harness or connector

WIRING DIAGRAM

A004RXOE04

CAUTION / NOTICE / HINT

Note


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

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

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

Tech Tips

When the communication between the steering lock ECU and certification ECU stops, DTC B2785 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTCs Click here.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

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

    A004RE0E02

    1. Disconnect the D54 and D57*2 (or D108*1) ECU connectors.

      *1: for Power Tilt and Power Telescopic Steering Column

      *2: for Manual Tilt and Manual Telescopic Steering Column

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D54-29 (LIN) - D57-5 (LIN)*2 or D108-6 (LIN)*1 Always Below 1 Ω
      D54-29 (LIN) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1 for Power Tilt and Power Telescopic Steering Column *3

      Front view of wire harness connector

      (to Certification ECU)
      *2 for Manual Tilt and Manual Telescopic Steering Column *4

      Front view of wire harness connector

      (to Steering Lock ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A004PUGE02

    1. Disconnect the D57*2 or D108*1 ECU connector.

      *1: for Power Tilt and Power Telescopic Steering Column

      *2: for Manual Tilt and Manual Telescopic Steering Column

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D57-1 (GND)*2 or D108-1 (GND)*1 - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      D57-7 (B)*2 or D108-2 (B)*1 - Body ground Always 11 to 14 V
      Text in Illustration
      *1 for Power Tilt and Power Telescopic Steering Column *3

      Front view of wire harness connector

      (to Steering Lock ECU)
      *2 for Manual Tilt and Manual Telescopic Steering Column - -

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE STEERING LOCK ACTUATOR ASSEMBLY


    1. Temporarily replace the steering lock actuator with a new one (See page for Power Tilt and Power Telescopic Steering Column, Click here for Manual Tilt and Manual Telescopic Steering Column).

    2. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck for DTCs Click here.

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

    A

    END (STEERING LOCK ECU IS DEFECTIVE)

    B

    REPLACE CERTIFICATION ECU