SEAT BELT WARNING SYSTEM Front Passenger Side Seat Belt Warning Light Malfunction

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 occupant detection sensor (separate type front seat cushion pad) detects if the passenger seat is occupied and sends signals to the combination meter assembly. The front seat inner belt assembly (for front passenger) detects the passenger seat belt condition and sends signals to the combination meter assembly. After receiving the signals from the occupant detection sensor (separate type front seat cushion pad) and front seat inner belt assembly (for front passenger), the seat belt warning light on the combination meter assembly will blink or go off.

WIRING DIAGRAM

B0042F5E07

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 ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

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


      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      P-Seatbelt Buckle SW Front passenger seat belt buckle switch signal ON or OFF

      OFF: Front passenger seat belt fastened

      ON: Front passenger seat belt not fastened

      		 The front passenger seat is occupied

      Body Electrical > Combination Meter > Data List
      Tester Display
      P-Seatbelt Buckle SW
      OK
      ON or OFF appears on the GTS screen according to the front passenger seat belt condition.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  2. INSPECT OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD)


    1. B0042WMC01
      *a

      Component without harness connected

      (Occupant Detection Sensor (Separate Type Front Seat Cushion Pad))

      Remove the occupant detection sensor (separate type front seat cushion pad).

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 3 Front passenger seat occupied Below 100 Ω
      1 - 3 Front passenger seat not occupied 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD) Click here

    OK

  3. INSPECT FRONT SEAT INNER BELT ASSEMBLY (FOR FRONT PASSENGER)


    1. B0042EZC01
      *A for LHD
      *B for RHD
      *a

      Component without harness connected

      (Front Seat Inner Belt Assembly (for Front Passenger))

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

      Click here

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      L16-3 - B-1 Always Below 1 Ω
      L16-2 - B-3 Front passenger seat belt unfastened Below 1 Ω
      L16-2 - B-3 Front passenger seat belt fastened 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      L15-3 - B-1 Always Below 1 Ω
      L15-2 - B-3 Front passenger seat belt unfastened Below 1 Ω
      L15-2 - B-3 Front passenger seat belt fastened 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - FRONT SEAT INNER BELT ASSEMBLY (FOR FRONT PASSENGER) - BODY GROUND)


    1. Disconnect the E46 combination meter assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      E46-7 (P/SB) - L16-3 Always Below 1 Ω
      E46-7 (P/SB) - Body ground Always 10 kΩ or higher
      L16-2 - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      E46-7 (P/SB) - L15-3 Always Below 1 Ω
      E46-7 (P/SB) - Body ground Always 10 kΩ or higher
      L15-2 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR