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

DTC Code

DTC Detection Condition

Trouble Area

B2786

LIN communication between the certification ECU and steering lock ECU stops for 10 seconds or more.

  • Steering lock actuator assembly (steering lock ECU)

  • Certification ECU

  • Harness or connector

WIRING DIAGRAM

B173719E54

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 light 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.

Tip:

When 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).

  2. CHECK FOR DTC

    1. Check for DTCs (Click here).

      Table 1. Result

      Result

      Proceed to

      DTC B2786 is output

      A

      DTC B2786 is not output

      B

    USE SIMULATION METHOD TO CHECK

    (Click here)

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

    1. U123692E02

      Disconnect the H51 and H54 ECU connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H51-29 (LIN) - H54-5 (LIN)

      Always

      Below 1 Ω

      H51-29 (LIN) - Body ground

      Always

      10 kΩ or higher
      Table 2. Text in Illustration

      *1

      Front view of wire harness connector

      (to Certification ECU)

      *2

      Front view of wire harness connector

      (to Steering Lock ECU)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    U122360E02

    1. Disconnect the H54 ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H54-1 (GND) - Body ground

      Always

      Below 1 Ω

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      H54-7 (B) - Body ground

      Always

      11 to 14 V
      Table 3. Text in Illustration

      *1

      Front view of wire harness connector

      (to Steering Lock ECU)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. Temporarily replace the steering lock actuator (steering lock ECU) with a new one (Click here).

    2. Clear the DTCs (Click here).

  6. CHECK FOR DTC

    1. Check for DTCs (Click here).

      Table 4. Result

      Result

      Proceed to

      DTC B2786 is not output

      A

      DTC B2786 is output

      B

    END (STEERING LOCK ECU IS DEFECTIVE)

    REPLACE CERTIFICATION ECU