SEAT BELT WARNING SYSTEM Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

When the ignition switch is turned to ON, the main body ECU (instrument panel junction block assembly) transmits front seat inner belt assembly LH*1 (or RH*2) state signals to the combination meter assembly through the CAN. If the driver seat belt is not fastened, the combination meter assembly blinks the front seat belt warning light. If the seat belt is fastened (front passenger side seat belt is fastened with the front passenger seat occupied or front passenger seat not occupied), the warning light goes off.


Tech Tips

The front seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat.

WIRING DIAGRAM

A004O0FE10

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      CAN system DTC is output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT BUCKLE SWITCH)


    1. Check the Data List for proper functioning of the driver side seat belt buckle switch Click here.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D Seat Buckle SW Driver side seat belt buckle signal / ON or OFF

      ON: Driver side seat belt fastened

      OFF: Driver side seat belt unfastened

      		 -
      OK
      The display is as specified in the normal condition column.

    NG

    INSPECT FRONT SEAT INNER BELT ASSEMBLY Click here

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT WARNING LIGHT)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the driver side seat belt warning light turns on/off Click here.

      Combination Meter
      Item Test Part Control Range Diagnostic Note
      Driver Side Seat Belt Driver side seat belt warning light ON or OFF Confirm that the vehicle is stopped and the engine is idling.
      OK
      Driver side seat belt warning light condition can be switched by Active Test.

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  4. INSPECT FRONT SEAT INNER BELT ASSEMBLY


    1. Remove the front seat inner belt assembly Click here.

    2. Inspect the front seat inner belt assembly Click here.


    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - MAIN BODY ECU AND BODY GROUND)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the G67*1 or H29*2 front seat inner belt assembly connector.

    2. Disconnect the D79 main body ECU (instrument panel junction block assembly) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G67-3 (+) - D79-26 (DBKL) Always Below 1 Ω
      G67-3 (+) or D79-26 (DBKL) - Body ground Always 10 kΩ or higher
      G67-4 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      H29-3 (+) - D79-26 (DBKL) Always Below 1 Ω
      H29-3 (+) or D79-26 (DBKL) - Body ground Always 10 kΩ or higher
      H29-4 (E) - Body ground Always Below 1 Ω

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR