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

DESCRIPTION

When the ignition switch ON, the center airbag sensor assembly*1 (main body ECU [cowl side junction block LH]*2) transmits front seat inner belt state signals to the combination meter assembly through the CAN. If the driver seat belt is not fastened, the combination meter assembly blinks the driver side seat belt warning light. If the seat belt is fastened, the warning light goes off.


WIRING DIAGRAM

A01X1ACE06
A01X6HYE03
w/o Airbag (for LHD)
*a CAN Line
*b Front Seat Inner Belt LH
*c Main Body ECU (Cowl Side Junction Block)
*d Combination Meter
A01X1ACE07
A01X6HYE04
w/o Airbag (for RHD)
*a Front Seat Inner Belt RH
*b Main Body ECU (Cowl Side Junction Block)
*c Combination Meter

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      w/ Airbag System A
      w/o Airbag System B

    B

    CHECK FOR DTC Click here

    A

  2. CHECK FOR DTC


    1. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      CAN system DTC is output (for LHD) B
      CAN system DTC is output (for RHD) C
      Airbag system DTC is output D

    B

    Go to CAN COMMUNICATION SYSTEM Click here

    C

    Go to CAN COMMUNICATION SYSTEM Click here

    D

    Go to AIRBAG SYSTEM Click here

    A

  3. READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE BUCKLE SWITCH)


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

      SRS Airbag
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Driver Buckle SW Driver side seat belt / Set, Unset or NG

      Set: Driver side seat belt is fastened

      Unset: Driver side seat belt is unfastened

      		 NG: Data is not determined
      Result
      Result Proceed to
      Set or Unset is displayed on the tester screen according to the driver side seat belt condition A
      Set or Unset is not displayed normally on the tester screen according to the driver side seat belt condition B
      NG is displayed on the tester screen C

    B

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (for Driver Side) Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    A

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


    1. Operate the intelligent tester according to the display and select Active Test.

      Combination Meter
      Item Test Part Control Range Diagnostic Note
      Driver Side Seat Belt Driver side seat belt warning light ON/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.
      Result
      Result Proceed to
      OK A
      NG (w/ Multi-information Display) B
      NG (w/o Multi-information Display) C

    B

    REPLACE COMBINATION METER Click here

    C

    REPLACE COMBINATION METER Click here

    A

  5. REPLACE CENTER AIRBAG SENSOR ASSEMBLY


    1. Temporarily replace the center airbag sensor assembly with a new one Click here.


    NEXT

  6. CHECK DRIVER SIDE SEAT BELT WARNING LIGHT


    1. Check the driver side seat belt warning light function Click here.

      OK
      Driver side seat belt warning light operates normally.
      Result
      Result Proceed to
      OK A
      NG (w/ Multi-information Display) B
      NG (w/o Multi-information Display) C

    A

    END (CENTER AIRBAG SENSOR ASSEMBLY IS DEFECTIVE)

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    C

    REPLACE COMBINATION METER ASSEMBLY Click here

  7. CHECK FOR DTC


    1. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      CAN system DTC is output (for LHD) B
      CAN system DTC is output (for RHD) C

    B

    Go to CAN COMMUNICATION SYSTEM Click here

    C

    Go to CAN COMMUNICATION SYSTEM Click here

    A

  8. READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE BUCKLE SWITCH)


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

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

      ON: Driver side seat belt is fastened

      OFF: Driver side seat belt is unfastened

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

    NG

    INSPECT FRONT SEAT INNER BELT ASSEMBLY (for Driver Side) Click here

    OK

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


    1. Operate the intelligent tester according to the steps on the display and select Active Test.

      Combination Meter
      Item Test Part Control Range Diagnostic Note
      Driver Side Seat Belt Driver side seat belt warning light ON/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 (COWL SIDE JUNCTION BLOCK LH)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  10. INSPECT FRONT SEAT INNER BELT ASSEMBLY (for Driver Side)


    1. A01X3NM

      Remove the front seat inner belt assembly (for Driver Side) Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      12 - 9 Seat belt unfastened (buckle switch is off) Below 1 Ω
      Seat belt fastened (buckle switch is on) 10 kΩ or higher

    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (for Driver Side) Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - COMBINATION METER AND BODY GROUND)


    1. Disconnect the K43*1 or L49*2 front seat inner belt assembly (for Driver Side) connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the E1 main body ECU (cowl side junction block LH) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      K43-12 - E1-7 (DBKL) Always Below 1 Ω
      K43-12 or E1-7 (DBKL) - Body ground Always 10 kΩ or higher
      K43-9 - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      L49-12 - E1-7 (DBKL) Always Below 1 Ω
      L49-12 or E1-7 (DBKL) - Body ground Always 10 kΩ or higher
      L49-9 - Body ground Always Below 1 Ω

    OK

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR