SEAT BELT WARNING SYSTEM(w/ Occupant Classification System) Front Passenger Side Seat Belt Warning Light Malfunction

DESCRIPTION

When the power switch is turned on (IG), the occupant detection ECU sends signals to the airbag ECU assembly to indicate the state of the front seat inner belt assembly RH and also whether the front passenger seat is occupied. The airbag ECU assembly sends those signals to the combination meter assembly via CAN communication. The seat belt warning light on the combination meter assembly illuminates, blinks or turns off in accordance with these signals.

WIRING DIAGRAM

B004OP1E23

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.

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Tech Tips

The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat.Check that the operation of the seat belt warning light is normal first.

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If the seat belt warning light does not operate for both the driver seat and front passenger seat, replace the meter circuit plate.

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PROCEDURE


  1. CHECK DTC OUTPUT (OCCUPANT CLASSIFICATION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Occupant Detection > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Occupant Detection > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO OCCUPANT CLASSIFICATION SYSTEM Click here

    A

  2. 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

  3. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Occupant Detection / Data List.

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


      Body Electrical > Occupant Detection > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Passenger Buckle SW Front passenger buckle switch Unset, Set or NG

      Unset: Seat belt not fastened

      Set: Seat belt fastened

      NG: Data is not determined

      		 -

      Body Electrical > Occupant Detection > Data List
      Tester Display
      Passenger Buckle SW
      Result
      Result Proceed to
      Unset or Set is displayed on the GTS according to the front passenger seat belt condition A
      Unset or Set is not displayed correctly on the GTS according to the front passenger seat belt condition B
      NG is displayed on the GTS C

    B

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    C

    REPLACE OCCUPANT DETECTION ECU Click here

    A

  4. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

      Unset: Seat belt not fastened

      Set: Seat belt fastened

      NG: Data is not determined

      		 -

      Body Electrical > SRS Airbag > Data List
      Tester Display
      Right side Buckle SW
      Result
      Result Proceed to
      Unset or Set is displayed on the GTS according to the front passenger seat belt condition A

      • Unset or Set is not displayed correctly on the GTS according to the front passenger seat belt condition

      • NG is displayed on the GTS

      		 B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIRBAG ECU ASSEMBLY Click here