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LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2789

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DTC Code DTC Name
B2789 No Response from ID BOX
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DESCRIPTION

This DTC is stored when LIN communication between the certification ECU and ID code box stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B2789 No communication between the certification ECU and ID code box for 10 seconds or more.

  • ID code box

  • Certification ECU

  • Harness or connector
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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 ID code box and certification ECU stops, DTC B2785 is also stored.

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PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTCs (Click here).


  2. Click here

    CHECK FOR DTC


    1. Check for DTCs (Click here).

      Table 1. Result
      Result Proceed to
      DTC B2789 is output A
      DTC B2789 is not output B

  3. Click here

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)


    1. A01ITKHE02

      Disconnect the H51 ECU connector.

    2. Disconnect the H35 box connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H51-29 (LIN) - H35-3 (LIN1) 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 ID Code Box)

  4. Click here

    CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)


    1. A01IP0KE05

      Disconnect the H35 box connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H35-8 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      H35-1 (+B) - Body ground Always 11 to 14 V
      Table 3. Text in Illustration
      *1

      Front view of wire harness connector

      (to ID Code Box)

  5. Click here

    REPLACE ID CODE BOX


    1. Temporarily replace the ID code box with a new one.

    2. Clear the DTCs (Click here).


  6. Click here

    CHECK FOR DTC


    1. Check for DTCs (Click here).

      Table 4. Result
      Result Proceed to
      DTC B2789 is not output A
      DTC B2789 is output B

  7. Click here

    USE SIMULATION METHOD TO CHECKClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    REPLACE CERTIFICATION ECU

  11. Click here

    END (ID CODE BOX IS DEFECTIVE)