SEAT BELT WARNING SYSTEM Rear Seat Belt Warning Light Malfunction

DESCRIPTION

The main body ECU (multiplex network body ECU) detects whether either rear door is open or closed based on the condition of the left and right courtesy light switches and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects the rear seat belt state. The rear seat belt warning lights on the combination meter assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

A01MI51E06

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 the How to Proceed with Troubleshooting procedure.

    Click here

  • When replacing the combination meter assembly, make sure to replace it with a new one.

PROCEDURE


  1. READ VALUE USING GTS (RR Door Courtesy SW, RL Door Courtesy SW)


    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
      RR Door Courtesy SW Rear door courtesy light switch RH ON or OFF

      ON: Rear door RH open

      OFF: Rear door RH closed

      		 -
      RL Door Courtesy SW Rear door courtesy light switch LH ON or OFF

      ON: Rear door LH open

      OFF: Rear door LH closed

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      RR Door Courtesy SW
      RL Door Courtesy SW
      OK
      The GTS display changes correctly in response to the rear door condition.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. READ VALUE USING GTS (2nd-Row Seatbelt Buckle [R], 2nd-Row Seatbelt Buckle [L])


    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 / 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
      2nd-Row Seatbelt Buckle (R) Rear seat belt buckle switch RH signal ON or OFF

      OFF: Rear RH seat belt fastened

      ON: Rear RH seat belt unfastened

      		 -
      2nd-Row Seatbelt Buckle (L) Rear seat belt buckle switch LH signal ON or OFF

      OFF: Rear LH seat belt fastened

      ON: Rear LH seat belt unfastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (R)
      2nd-Row Seatbelt Buckle (L)
      Result
      Result Proceed to
      ON or OFF is displayed on the GTS screen according to the rear seat belt condition A
      ON or OFF is not displayed normally on the GTS screen according to the rear RH seat belt condition B
      ON or OFF is not displayed normally on the GTS screen according to the rear LH seat belt condition C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    C

    INSPECT REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH Click here

    B

  3. INSPECT REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH


    1. Remove the rear seat 3 point type belt assembly RH.

      Click here

    2. Inspect the rear seat 3 point type belt assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the Q25 rear seat 3 point type belt assembly RH connector.

    2. Disconnect the G13 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q25-2 - G13-10 (RRSB) Always Below 1 Ω
      Q25-2 or G13-10 (RRSB) - Body ground Always 10 kΩ or higher
      Q25-1 - 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

  5. INSPECT REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH


    1. Remove the rear seat 3 point type belt assembly LH.

      Click here

    2. Inspect the rear seat 3 point type belt assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the P44 rear seat 3 point type belt assembly LH connector.

    2. Disconnect the G13 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P44-2- G13-12 (RLSB) Always Below 1 Ω
      P44-2 or G13-12 (RLSB) - Body ground Always 10 kΩ or higher
      P44-1 - 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