SEAT BELT WARNING SYSTEM(w/ Occupant Classification System) Rear Seat Belt Warning Light Malfunction

DESCRIPTION

The main body ECU (multiplex network body ECU) detects whether either the rear doors are open or closed based on the courtesy light switch condition and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects rear seat belt state. The rear seat belt warning light on the telltale light assembly illuminates, blinks or turns off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

B0070TQE01

CAUTION / NOTICE / HINT

Note


  • The seat belt warning system (w/ occupant classification 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

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

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. CHECK REAR SEAT BELT WARNING


    1. B006Z61C02
      *1 Rear Seat Belt Warning Light (Telltale Light 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 operation is normal 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 RIGHT SEAT BUCKLE / OCCUPANT DETECTION WARNING SWITCH) Click here

    D

    READ VALUE USING GTS (REAR CENTER SEAT BUCKLE / OCCUPANT DETECTION WARNING SWITCH) Click here

    E

    READ VALUE USING GTS (REAR LEFT SEAT BUCKLE / OCCUPANT DETECTION WARNING SWITCH) Click here

    B

  3. PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING)


    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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Seat Belt Warning Rear seat belt warning light OFF/ON -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Rear Seat Belt Warning
      Result
      Result Proceed to
      The rear seat belt warning light does not operate normally A
      The rear seat belt warning light operates normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the K36 telltale light assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K36-10 (IG+) - Body ground Engine 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. Reconnect the K36 telltale light assembly connector.

    2. Disconnect the K21 combination meter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K21-18 (RLMT) - Body ground Engine switch on (IG) 11 to 14 V
      K21-19 (RCMT) - Body ground Engine switch on (IG) 11 to 14 V
      K21-20 (RRMT) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

  6. READ VALUE USING GTS (REAR RIGHT SEAT BUCKLE / OCCUPANT DETECTION WARNING SWITCH)


    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
      Rear Right Seat Buckle / Occupant Detection Warning Switch Rear seat inner with center belt RH buckle 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
      Rear Right Seat Buckle / Occupant Detection Warning Switch
      Result
      Result Proceed to
      ON or OFF does not appear on the tester screen according to the rear seat belt condition A
      ON or OFF appears on the tester screen according to the rear seat belt condition B

    B

    PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING) Click here

    A

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


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the R72 rear seat inner with center belt assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-26 (RRSB) - R72-5 Always Below 1 Ω
      K21-26 (RRSB) or R72-5 - Body ground Always 10 kΩ or higher
      R72-4 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING)


    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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Seat Belt Warning Rear seat belt warning light OFF/ON -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Rear Seat Belt Warning
      Result
      Result Proceed to
      The rear seat belt warning light does not operate normally A
      The rear seat belt warning light operates normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the K36 telltale light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-20 (RRMT) - K36-3 (RRID) Always Below 1 Ω
      K21-20 (RRMT) or K36-3 (RRID) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. READ VALUE USING GTS (REAR CENTER SEAT BUCKLE / OCCUPANT DETECTION WARNING SWITCH)


    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
      Rear Center Seat Buckle / Occupant Detection Warning Switch Rear seat inner with center belt LH (for center) buckle signal ON or OFF

      OFF: Rear LH seat belt (for center) fastened

      ON: Rear LH seat belt (for center) not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Rear Center Seat Buckle / Occupant Detection Warning Switch
      Result
      Result Proceed to
      ON or OFF does not appear on the tester screen according to the rear seat belt condition A
      ON or OFF appears on the tester screen according to the rear seat belt condition B

    B

    PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING) Click here

    A

  11. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH (FOR CENTER) - BODY GROUND)


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the R74 rear seat inner with center belt assembly LH (for center) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-25 (RCSB) - R74-1 Always Below 1 Ω
      K21-25 (RCSB) or R74-1 - Body ground Always 10 kΩ or higher
      R74-2 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING)


    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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Seat Belt Warning Rear seat belt warning light OFF/ON -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Rear Seat Belt Warning
      Result
      Result Proceed to
      The rear seat belt warning light does not operate normally A
      The rear seat belt warning light operates normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the K36 telltale light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-19 (RCMT) - K36-2 (RCID) Always Below 1 Ω
      K21-19 (RCMT) or K36-2 (RCID) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. READ VALUE USING GTS (REAR LEFT SEAT BUCKLE / OCCUPANT DETECTION WARNING SWITCH)


    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
      Rear Left Seat Buckle / Occupant Detection Warning Switch Rear seat inner with center belt LH (for LH) buckle signal ON or OFF

      OFF: Rear LH seat belt (for LH) fastened

      ON: Rear LH seat belt (for LH) not fastened

      		 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Rear Left Seat Buckle / Occupant Detection Warning Switch
      Result
      Result Proceed to
      ON or OFF does not appear on the tester screen according to the rear seat belt condition A
      ON or OFF appears on the tester screen according to the rear seat belt condition B

    B

    PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING) Click here

    A

  15. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH (FOR LH) - BODY GROUND)


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the R73 rear seat inner with center belt assembly LH (for LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-24 (RLSB) - R73-5 Always Below 1 Ω
      K21-24 (RLSB) or R73-5 - Body ground Always 10 kΩ or higher
      R73-4 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT INNER WITH CENTER BELT ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. PERFORM ACTIVE TEST USING GTS (REAR SEAT BELT WARNING)


    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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Seat Belt Warning Rear seat belt warning light OFF/ON -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Rear Seat Belt Warning
      Result
      Result Proceed to
      The rear seat belt warning light does not operate normally A
      The rear seat belt warning light operates normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the K21 combination meter assembly connector.

    2. Disconnect the K36 telltale light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-18 (RLMT) - K36-1 (RLID) Always Below 1 Ω
      K21-18 (RLMT) or K36-1 (RLID) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR