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LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2786

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DTC Code DTC Name
B2786 No Response from Steering Lock ECU
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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
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

  • If the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator assembly) is replaced, refer to Service Bulletin.

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs.

      Result
      Result Proceed to
      Only B2786 is output A
      DTC B2786 and B2785 are output simultaneously B
      Tip:

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


  2. Click here

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


    1. Disconnect the H18 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
      H18-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      H18-7 (B) - Body ground Power switch off 11 to 14 V

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. Disconnect the H58 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
      H58-12 (LIN) - H18-5 (LIN) Always Below 1 Ω
      H58-12 (LIN) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)


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


  5. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs.

      OK
      DTC B2786 is not output.

    • OK

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

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)