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

DESCRIPTION

When the ignition switch is ON, the main body ECU communicates the status of the front seat inner belt (driver side) to the combination meter assembly using the CAN communication line. When the seat belt is unfastened, the combination meter assembly flashes the driver side seat belt warning light on the combination meter assembly. When the seat belt is fastened, the combination meter assembly stops flashing the warning light.

WIRING DIAGRAM

A01170NE01

INSPECTION PROCEDURE

Note

Since the seat belt warning system has functions that use CAN communication, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with How to Proceed with Troubleshooting. Then conduct the following troubleshooting procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Body / Combination Meter / Active Test.

    5. According to the display on the tester, perform the Active Test.

      Combination Meter
      Item Test Part Control Range Diagnostic Note
      Driver Side Seat Belt Driver side seat belt warning light ON / OFF -
      OK
      Driver side seat belt warning light condition can be switched by Active Test.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (D SEAT BUCKLE SW)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. According to the display on the tester, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D Seat Buckle SW Buckle switch (Driver side)/ 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 (DRIVER SIDE) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. INSPECT FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)


    1. A0119IVE01
      Text in Illustration
      *1

      Component without harness connected

      (Front Seat Inner Belt (Driver Side))

      Disconnect the G11 or G7 front seat inner belt assembly (driver side) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (E) - 2 (+) Tongue plate fastened 10 kΩ or higher
      Tongue plate unfastened Below 1 Ω

    3. Reconnect the front seat inner belt assembly (driver side) connector.


    NG

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

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - INSTRUMENT PANEL JUNCTION BLOCK)


    1. A011AXTE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block)
      *2

      Front view of wire harness connector

      (to Front Seat Inner Belt (Driver Side))
      *3 for LHD
      *4 for RHD

      Disconnect the G11 or G7 front seat inner belt assembly (driver side) connector.

    2. Disconnect the 3E instrument panel junction block connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3E-20 - G11-2 (+) Always Below 1 Ω
      3E-20 or G11-2 (+) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      3E-20 - G7-2 (+) Always Below 1 Ω
      3E-20 or G7-2 (+) - Body ground Always 10 kΩ or higher

    4. Reconnect the front seat inner belt assembly (driver side) connector.

    5. Reconnect the instrument panel junction block connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE) - BODY GROUND)


    1. A011BIWE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Seat Inner Belt (Driver Side))
      *2 for LHD
      *3 for RHD

      Disconnect the G11 or G7 front seat inner belt assembly (driver side) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G11-1 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G7-1 (E) - Body ground Always Below 1 Ω

    3. Reconnect the front seat inner belt assembly (driver side) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE MAIN BODY ECU


    1. Temporarily replace the main body ECU with a new or normally functioning one Click here.


    NEXT

  7. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. According to the display on the tester, read the Data List.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D Seat Buckle SW Buckle switch (Driver side)/ 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

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK

    OK

    END (MAIN BODY ECU IS DEFECTIVE)