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

DESCRIPTION

Tech Tips

The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat.

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 (for driver).

WIRING DIAGRAM

A013AG3E12

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.

Click here

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 COMBINATION METER ASSEMBLY Click here

    NG

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


    1. A013AHOC01
      *a

      Component without harness connected

      (Front Seat Inner Belt Assembly (for Driver))

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

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 3 Driver seat belt unfastened Below 1 Ω
      2 - 3 Driver seat belt fastened 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


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

      for LHD: Click here

      for RHD: Click here

      A013ABLC01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Disconnect the 3E 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) - 3E-36 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here

    OK

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


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3E-36 - L15-3 Always Below 1 Ω
      L15-3 - Body ground Always 10 kΩ or higher
      L15-2 - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      3E-36 - L16-3 Always Below 1 Ω
      L16-3 - Body ground Always 10 kΩ or higher
      L16-2 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR