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 front door courtesy light switch assemblies and then sends the front 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 telltail light assembly illuminate or turn off in accordance with the front door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

B000QF0E01

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, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

  • Replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. READ VALUE USING GTS (FR DOOR COURTESY SW, FL 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
      FR Door Courtesy SW Front door courtesy light switch assembly RH signal OFF or ON

      OFF: Front door RH closed

      ON: Front door RH open

      		 -
      FL Door Courtesy SW Front door courtesy light switch assembly LH signal OFF or ON

      OFF: Front door LH closed

      ON: Front door LH open

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL 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 RH seat belt buckle switch signal ON or OFF

      ON: Rear RH seat belt fastened

      OFF: Rear RH seat belt not fastened

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

      ON: Rear LH seat belt fastened

      OFF: Rear LH seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (R)
      2nd-Row Seatbelt Buckle (L)
      OK
      ON or OFF is displayed on the GTS according to the rear seat belt condition.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT REAR SEAT INNER BELT ASSEMBLY Click here

    OK

  3. INSPECT TELLTALE LIGHT ASSEMBLY


    1. Remove the telltale light assembly.

      Click here

    2. Inspect he telltale light assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    OK

  4. CHECK TELLTALE LIGHT ASSEMBLY


    1. B000TABC02
      *a

      Front view of wire harness connector

      (to Telltail light assembly connector)

      Disconnect the telltale light assembly connector.

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

      Standard Voltage
      Teseter Connection Switch Condition Specified Condition
      P88-1 (IG+) - Body ground Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. Disconnect the P88 telltale light assembly connector.

    2. Disconnect the P25 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P88-8 (RLID) - P25-35 (RLBT) Always Below 1 Ω
      P88-9 (RRID) - P25-37 (RRBT) Always Below 1 Ω
      P88-8 (RLID) or P25-35 (RLBT) - Body ground Always 10 kΩ or higher
      P88-9 (RRID) or P25-37 (RRBT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK COMBINATION METER ASSEMBLY


    1. Replace combination meter assembly with a new one.

    2. Check the seat belt warning system operation.

      Click here

      OK
      The seet belt warning function is operated normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)

    NG

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

  7. INSPECT REAR SEAT INNER BELT ASSEMBLY


    1. for LH:


      1. Remove the No. 1 rear seat inner belt assembly LH.

        Click here

      2. Inspect the No. 1 rear seat inner belt assembly LH.

        Click here

    2. for RH:


      1. Remove the rear seat inner belt assembly RH.

        Click here

      2. Inspect the rear seat inner belt assembly RH.

        Click here

      Result
      Result Proceed to
      OK A
      NG (for LH) B
      NG (for RH) C

    B

    REPLACE NO.1 REAR SEAT INNER BELT ASSEMBLY LH Click here

    C

    REPLACE REAR SEAT INNER BELT ASSEMBLY RH Click here

    A

  8. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the X74 No. 1 rear seat inner belt assembly LH connector.

    2. Disconnect the X73 rear seat inner belt assembly RH connector.

    3. Disconnec the P25 combination meter assembly connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LH
      Tester Connection Condition Specified Condition
      X74-2 (LBR+) - P25-6 (RLSB) Always Below 1 Ω
      X74-1 (LBR-) - Body ground Always Below 1 Ω
      X74-2 (LBR+) or P25-6 (RLSB) - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      X73-2 (RBR+) - P25-10 (RRSB) Always Below 1 Ω
      X73-1 (RBR-) - Body ground Always Below 1 Ω
      X73-2 (RBR+) or P25-10 (RRSB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR