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

DESCRIPTION

When the driver seat belt is not fastened with the engine switch on (IG), the driver seat belt warning light on the combination meter assembly blinks to inform the driver. The main body ECU detects the driver seat belt condition and sends a signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

A01CB40E07

INSPECTION PROCEDURE

Note

The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the communication system by checking communication function of the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

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

      OFF: Driver seat belt fastened

      ON: Driver seat belt not fastened

      		 -
      OK
      ON or OFF appears on the tester screen according to the driver seat belt condition.

    NG

    INSPECT FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER SIDE) Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Data List.

    5. Perform the Active Test according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Driver Side Seat Belt Driver seat belt warning light OFF or ON Confirm that the vehicle is stopped with the engine idling.
      OK
      The driver seat belt warning light on the combination meter assembly operates normally.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE MAIN BODY ECU Click here

  3. INSPECT FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER SIDE)


    1. Remove the front seat inner belt assembly (for driver side) (for Manual Seat) Click here.

    2. A01CB28E17

      Remove the front seat inner belt assembly (for driver side) (for Power Seat) Click here.

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

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      V5-1 (+) - V5-2 (E) Driver seat belt unfastened Below 1 Ω
      V5-1 (+) - V5-2 (E) Driver seat belt fastened 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      W13-1 (+) - W13-2 (E) Driver seat belt unfastened Below 1 Ω
      W13-1 (+) - W13-2 (E) Driver seat belt fastened 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for Manual Seat) B
      NG (for Power Seat) C

    B

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER SIDE) (for Manual Seat) Click here

    C

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER SIDE) (for Power Seat) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT SEAT INNER BELT ASSEMBLY)


    1. A01CDS3E05

      Disconnect the G48 connector.

    2. Disconnect the V5*1 or W13*2 connector.

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


      • *1: for RHD

      • *2: for LHD

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      G48-7 (DBKL) - V5-1 (+) Always Below 1 Ω
      V5-1 (+) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      G48-7 (DBKL) - W13-1 (+) Always Below 1 Ω
      W13-1 (+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01CFOQE08

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

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      V5-2 (E) - Body ground Always Below 1 Ω
      for LHD
      Tester Connection Condition Specified Condition
      W13-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU Click here