SEAT BELT WARNING SYSTEM(w/o Occupant Classification System) Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

The combination meter assembly 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 (driver seat).

WIRING DIAGRAM

B004PO2E39

CAUTION / NOTICE / HINT

Note

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

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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. 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 / Main Body / Data List.

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      D Seat Buckle SW Driver seat belt buckle switch ON or OFF

      ON: Driver seat belt unfastened

      OFF: Driver seat belt fastened

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      D Seat Buckle SW
      OK
      ON or OFF appears on the GTS screen according to the driver seat belt condition.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  2. INSPECT FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT)


    1. Remove the front seat inner belt assembly (driver seat).

      Click here

    2. Inspect the front seat inner belt assembly (driver seat) (seat belt warning switch).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SEAT) Click here

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the main body ECU (multiplex network body ECU).

      Click here

      B004R15C08
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Disconnect the 3H instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MB-18 (DBKL) - 3H-33 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3H-33 - M70-3 Always Below 1 Ω
      M70-3 - Body ground Always 10 kΩ or higher
      M70-2 - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      3H-33 - M66-3 Always Below 1 Ω
      M66-3 - Body ground Always 10 kΩ or higher
      M66-2 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR