SEAT BELT WARNING SYSTEM(w/o Occupant Classification 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 air conditioning control assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

B005B6RE01
B005B6RE02
B0059EEE02

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

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • 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 engine 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], 2nd-Row Seatbelt Buckle [C])


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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

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

      OFF: Rear center seat belt fastened

      ON: Rear center seat belt unfastened

      		 -

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

    B

    INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH Click here

    C

    INSPECT REAR SEAT INNER BELT ASSEMBLY LH Click here

    A

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY)


    1. B0059WRC10
      *a

      Front view wire harness connector

      (to Air Conditioning Control Assembly)

      Disconnect the air conditioning control assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I13-8 (IG+) - Body ground Engine switch on (IG)

      11 to 14 V*1

      10.5 to 16 V*2
      Engine switch off Below 1 V

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT AIR CONDITIONING CONTROL ASSEMBLY


    1. Remove the air conditioning control assembly.

      Click here

    2. Inspect the air conditioning control assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. Disconnect the I13 air conditioning control assembly connector.

    2. Disconnect the I10 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I10-35 (RLMT) - I13-3 (RLID) Always Below 1 Ω
      I10-35 (RLMT) or I13-3 (RLID) - Body ground Always 10 kΩ or higher
      I10-36 (RCMT) - I13-2 (RCID) Always Below 1 Ω
      I10-36 (RCMT) or I13-2 (RCID) - Body ground Always 10 kΩ or higher
      I10-37 (RRMT) - I13-1 (RRID) Always Below 1 Ω
      I10-37 (RRMT) or I13-1 (RRID) - 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

  6. INSPECT REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH


    1. Remove the rear seat inner with center belt assembly RH.

      Click here

    2. Inspect the rear seat inner with center belt assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the h5*1 or Q49*2 rear seat inner with center belt assembly RH connector.


      • *1: w/ Rear Power Seat System

        *2: w/o Rear Power Seat System

    2. Disconnect the I10 combination meter assembly connector.

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

      Standard Resistance
      w/ Rear Power Seat System
      Tester Connection Condition Specified Condition
      h5-3 - I10-13 (RCSB) Always Below 1 Ω
      h5-3 or I10-13 (RCSB) - Body ground Always 10 kΩ or higher
      h5-5 - I10-12 (RRSB) Always Below 1 Ω
      h5-5 or I10-12 (RRSB) - Body ground Always 10 kΩ or higher
      h5-4 - Body ground Always Below 1 Ω
      h5-2 - Body ground Always Below 1 Ω
      w/o Rear Power Seat System
      Tester Connection Condition Specified Condition
      Q49-15 (CBR+) - I10-13 (RCSB) Always Below 1 Ω
      Q49-15 (CBR+) or I10-13 (RCSB) - Body ground Always 10 kΩ or higher
      Q49-5 (RBR+) - I10-12 (RRSB) Always Below 1 Ω
      Q49-5 (RBR+) or I10-12 (RRSB) - Body ground Always 10 kΩ or higher
      Q49-22 (CBR-) - Body ground Always Below 1 Ω
      Q49-2 (RBR-) - 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

  8. INSPECT REAR SEAT INNER BELT ASSEMBLY LH


    1. Remove the rear seat inner belt assembly LH.

      Click here

    2. Inspect the rear seat inner belt assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY LH Click here

    OK

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


    1. Disconnect the i5*1 or Q50*2 rear seat inner belt assembly connector.


      • *1: w/ Rear Power Seat System

        *2: w/o Rear Power Seat System

    2. Disconnect the I10 combination meter assembly connector.

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

      Standard Resistance
      w/ Rear Power Seat System
      Tester Connection Condition Specified Condition
      i5-1 - I10-14 (RLSB) Always Below 1 Ω
      i5-1 or I10-14 (RLSB) - Body ground Always 10 kΩ or higher
      i5-2 - Body ground Always Below 1 Ω
      w/o Rear Power Seat System
      Tester Connection Condition Specified Condition
      Q50-13 (LBR+) - I10-14 (RLSB) Always Below 1 Ω
      Q50-13 (LBR+) or I10-14 (RLSB) - Body ground Always 10 kΩ or higher
      Q50-18 (LBR-) - 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