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

DESCRIPTION

The combination meter assembly illuminates, blinks or turns off the seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly LH.

WIRING DIAGRAM

A002BN8E20

CAUTION / NOTICE / HINT

Note


  • The seat belt warning system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.*


    • *: w/ Smart Entry and Start System

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here


    • *: for LHD

PROCEDURE


  1. CHECK DTC OUTPUT (AIRBAG SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO AIRBAG SYSTEM Click here

    A

  2. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / SRS Airbag / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > SRS Airbag > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Left side Buckle SW LH buckle switch*1 Unset, Set or NG

      Unset: Seat belt not fastened

      Set: Seat belt fastened

      NG: Data is not determined

      		 -
      Right side Buckle SW RH buckle switch*2 Unset, Set or NG

      Unset: Seat belt not fastened

      Set: Seat belt fastened

      NG: Data is not determined

      		 -

      • *1: for LHD

      • *2: for RHD


      Body Electrical > SRS Airbag > Data List
      Tester Display
      Left side Buckle SW
      Right side Buckle SW
      Result
      Result Proceed to
      Unset or Set is displayed on the GTS according to the driver seat belt condition A
      Unset or Set is not displayed correctly on the GTS according to the driver seat belt condition B
      NG is displayed on the GTS C

    B

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT) for Manual Seat: Click here
    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT) for Power Seat: Click here

    C

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    A

  3. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Temporarily replace the main body ECU (multiplex network body ECU) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK SEAT BELT WARNING LIGHT


    1. Check the operation of the seat belt warning light.

      Click here

      OK
      The seat belt warning light operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) WAS DEFECTIVE)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here