SEAT BELT WARNING SYSTEM Rear Seat Belt Warning Light Malfunction

DESCRIPTION

When the rear seat belt is not fastened after the rear door is opened and closed with the power switch on (IG), the rear seat belt warning light on the combination switch assembly is illuminated. The main body ECU (multiplex network body ECU) detects whether any of 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. When the combination meter assembly detects that any courtesy light switch is turned off while the power switch is on (IG), or that any courtesy light switch is turned off and then the power switch is turned on (IG), the combination meter assembly shows the rear seat belt warning light on the combination switch assembly. Then the combination meter assembly shows the current status of the rear seat belts according to each buckle switch condition.

WIRING DIAGRAM

B001L4DE01

CAUTION / NOTICE / HINT

Note

The seat belt warning 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.

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Door Courtesy SW Rear door courtesy light switch signal/ON or OFF

      ON: Rear door RH open

      OFF: Rear door RH closed

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

      ON: Rear door LH open

      OFF: Rear door LH closed

      		 -
      OK
      The intelligent tester display changes correctly in response to the rear door condition.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. CHECK REAR SEAT BELT WARNING


    1. B001KZRE01
      Text in Illustration
      *1 Rear Seat Belt Warning Light (Combination Switch 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 INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH (for RH)) Click here

    D

    READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH (for Center)) Click here

    E

    READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH (for LH)) Click here

    B

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Active test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Rear Seat Belt Rear seat belt warning light OFF / ON -
      Result
      Result Proceed to
      The rear seat belt warning lights do not operate normally A
      The rear seat belt warning lights operate normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the H72 combination switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H72-8 (B) - Body ground Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the H72 combination switch assembly connector.

    2. Disconnect the H19 combination meter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H19-25 (RLMT) - Body ground Power switch on (IG) 11 to 14 V
      H19-38 (RCMT) - Body ground Power switch on (IG) 11 to 14 V
      H19-35 (RRMT) - Body ground Power switch on (IG) 11 to 14 V

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

  6. READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH (for RH))


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      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

      		 -
      Result
      Result Proceed to
      ON or OFF does not appear on the intelligent tester screen according to the rear seat belt condition A
      ON or OFF appears on the intelligent tester screen according to the rear seat belt condition B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT) Click here

    A

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


    1. Disconnect the H19 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-4 (RRSB) - P17-1 Always Below 1 Ω
      H19-4 (RRSB) or P17-1 - Body ground Always 10 kΩ or higher
      P17-2 - Body ground Always Below 1 Ω

    OK

    REPLACE REAR SEAT INNER BELT ASSEMBLY (for RH) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Active test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Rear Seat Belt Rear seat belt warning light OFF / ON -
      Result
      Result Proceed to
      The rear seat belt warning lights do not operate normally A
      The rear seat belt warning lights operate normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the H72 combination switch assembly connector.

    2. Disconnect the H19 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H72-12 (RRID) - H19-35 (RRMT) Always Below 1 Ω
      H72-12 (RRID) or H19-35 (RRMT) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH (for Center))


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      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

      		 -
      Result
      Result Proceed to
      ON or OFF does not appear on the intelligent tester screen according to the rear seat belt condition A
      ON or OFF appears on the intelligent tester screen according to the rear seat belt condition B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT) Click here

    A

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


    1. Disconnect the H19 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-5 (RCSB) - P18-1 Always Below 1 Ω
      H19-5 (RCSB) or P18-1 - Body ground Always 10 kΩ or higher
      P18-2 - Body ground Always Below 1 Ω

    OK

    REPLACE REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (for Center) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Active test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Rear Seat Belt Rear seat belt warning light OFF / ON -
      Result
      Result Proceed to
      The rear seat belt warning lights do not operate normally A
      The rear seat belt warning lights operate normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the H72 combination switch assembly connector.

    2. Disconnect the H19 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H72-11 (RCID) - H19-38 (RCMT) Always Below 1 Ω
      H72-11 (RCID) or H19-38 (RCMT) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH (for LH))


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Data List.

    5. Read the Data List according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      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

      		 -
      Result
      Result Proceed to
      ON or OFF does not appear on the intelligent tester screen according to the rear seat belt condition A
      ON or OFF appears on the intelligent tester screen according to the rear seat belt condition B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT) Click here

    A

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


    1. Disconnect the H19 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-6 (RLSB) - P19-1 Always Below 1 Ω
      H19-6 (RLSB) - Body ground Always 10 kΩ or higher
      P19-2 - Body ground Always Below 1 Ω

    OK

    REPLACE REAR SEAT INNER W/ CENTER BELT ASSEMBLY LH (for LH) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR SEAT BELT WARNING LIGHT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter / Active test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Rear Seat Belt Rear seat belt warning light OFF / ON -
      Result
      Result Proceed to
      The rear seat belt warning lights do not operate normally A
      The rear seat belt warning lights operate normally B

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

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


    1. Disconnect the H72 combination switch assembly connector.

    2. Disconnect the H19 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H72-10 (RLID) - H19-25 (RLMT) Always Below 1 Ω
      H72-10 (RLID) or H19-25 (RLMT) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR