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 clock assembly illuminate or turn off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

B004005E02

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 How to Proceed with Troubleshooting.

    Click here

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

PROCEDURE


  1. READ VALUE USING GTS (REAR DOOR COURTESY LIGHT SWITCH)


    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 / 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 assembly (RH side) signal ON or OFF

      ON: Rear door RH open

      OFF: Rear door RH closed

      		 -
      RL Door Courtesy SW Rear door courtesy light switch assembly (LH side) signal 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 (Rear Door Courtesy Switch Circuit) Click here

    OK

  2. CHECK REAR SEAT BELT WARNING


    1. B003ZV6C01
      *1 Rear Seat Belt Warning Light (Clock Assembly)
      *a LH
      *b Center
      *c RH

      Check the rear seat belt warning function.

      Click here

      Result
      Result Proceed to
      The rear seat belt warning lights operate normally A
      The rear seat belt warning lights (all seats) do not operate normally B
      The rear seat belt warning light (RH) does not operate normally C
      The rear seat belt warning light (center) does not operate normally D
      The rear seat belt warning light (LH) does not operate normally E

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    READ VALUE USING GTS (REAR RH SEAT BELT BUCKLE SWITCH) Click here

    D

    READ VALUE USING GTS (REAR CENTER SEAT BELT BUCKLE SWITCH) Click here

    E

    READ VALUE USING GTS (REAR LH SEAT BELT BUCKLE SWITCH) Click here

    B

  3. INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY)


    1. Remove the rear seat belt warning light (clock assembly).

      Click here

    2. Inspect the rear seat belt warning light (LH, center and RH) (clock assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (IGNITION POWER SUPPLY - CLOCK ASSEMBLY)


    1. Disconnect the G7 clock assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G7-1 (IG+) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the F21 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F21-3 (RRMT) - G7-11 (RRID) Always Below 1 Ω
      F21-3 (RRMT) or G7-11 (RRID) - Body ground Always 10 kΩ or higher
      F21-2 (RCMT) - G7-12 (RCID) Always Below 1 Ω
      F21-2 (RCMT) or G7-12 (RCID) - Body ground Always 10 kΩ or higher
      F21-6 (RLMT) - G7-13 (RLID) Always Below 1 Ω
      F21-6 (RLMT) or G7-13 (RLID) - 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. READ VALUE USING GTS (REAR RH SEAT BELT BUCKLE SWITCH)


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

      OFF: Rear RH seat belt fastened

      ON: Rear RH seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (R)
      Result
      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    B

    INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    A

  7. INSPECT REAR SEAT INNER BELT ASSEMBLY


    1. Remove the rear seat inner belt assembly.

      Click here

    2. Inspect the rear seat inner belt assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY Click here

    OK

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


    1. Disconnect the F126 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F126-14 (RRSB) - i2-1 Always Below 1 Ω
      F126-14 (RRSB) or i2-1 - Body ground Always 10 kΩ or higher
      i2-4 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT INNER BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY)


    1. Remove the rear seat belt warning light (clock assembly).

      Click here

    2. Inspect the rear seat belt warning light (RH) (clock assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - CLOCK ASSEMBLY)


    1. Disconnect the F21 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F21-3 (RRMT) - G7-11 (RRID) Always Below 1 Ω
      F21-3 (RRMT) or G7-11 (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

  11. READ VALUE USING GTS (REAR CENTER SEAT BELT BUCKLE SWITCH)


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

      OFF: Rear center seat belt fastened

      ON: Rear center seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (C)
      Result
      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    B

    INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    A

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


    1. Disconnect the F126 combination meter assembly connector.

    2. Disconnect the i2 rear seat inner belt assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F126-13 (RCSB) - i2-2 Always Below 1 Ω
      F126-13 (RCSB) or i2-2 - Body ground Always 10 kΩ or higher
      i2-5 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT INNER BELT ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY)


    1. Remove the rear seat belt warning light (clock assembly).

      Click here

    2. Inspect the rear seat belt warning light (center) (clock assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - CLOCK ASSEMBLY)


    1. Disconnect the F21 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F21-2 (RCMT) - G7-12 (RCID) Always Below 1 Ω
      F21-2 (RCMT) or G7-12 (RCID) - 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

  15. READ VALUE USING GTS (REAR LH SEAT BELT BUCKLE SWITCH)


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

      OFF: Rear LH seat belt fastened

      ON: Rear LH seat belt not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      2nd-Row Seatbelt Buckle (L)
      Result
      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    B

    INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    A

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


    1. Disconnect the F126 combination meter assembly connector.

    2. Disconnect the j2 rear seat 3 point type belt assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F126-12 (RLSB) - j2-3 Always Below 1 Ω
      F126-12 (RLSB) or j2-3 (LBR+) - Body ground Always 10 kΩ or higher
      j2-5 (LBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. INSPECT REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY)


    1. Remove the rear seat belt warning light (clock assembly).

      Click here

    2. Inspect the rear seat belt warning light (LH) (clock assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT BELT WARNING LIGHT (CLOCK ASSEMBLY) Click here

    OK

  18. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - CLOCK ASSEMBLY)


    1. Disconnect the F21 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F21-6 (RLMT) - G7-13 (RLID) Always Below 1 Ω
      F21-6 (RLMT) or G7-13 (RLID) - 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