SEAT BELT WARNING 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 sub-assembly. The combination meter sub-assembly detects rear seat belt state. The rear seat belt warning light on the combination meter sub-assembly illuminates or turns off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

A005A8BE05

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 GTS (REAR DOOR COURTESY LIGHT SWITCH)


    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.

      Main Body
      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 or LH open

      OFF: Rear door RH and LH closed

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

      ON: Rear door LH or RH open

      OFF: Rear door LH and RH closed

      		 -
      OK
      ON or OFF appears on the tester screen according to the rear door condition.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. CHECK REAR SEAT BELT WARNING


    1. A005DY5E01
      Text in Illustration
      *a Rear Seat Belt Warning Light (Combination Meter Sub-assembly)
      *b Rear No. 1 Seat LH
      *c Rear No. 1 Seat Center
      *d Rear No. 1 Seat RH
      *e Rear No. 2 Seat LH
      *f Rear No. 2 Seat 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 seat) operation is not normal B
      The rear seat belt warning lights (any seat) operation is not normal C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK REAR SEAT BELT WARNING Click here

    B

  3. REPLACE METER CIRCUIT PLATE

    Replace the meter circuit plate Click here.


    NEXT

  4. CHECK REAR SEAT BELT WARNING


    1. Check the rear seat belt warning function Click here.

      OK
      The rear seat belt warning function operates normally.

    OK

    END (METER CIRCUIT PLATE WAS DEFECTIVE)

    NG

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

  5. CHECK REAR SEAT BELT WARNING


    1. A005DY5E01
      Text in Illustration
      *a Rear Seat Belt Warning Light (Combination Meter Sub-assembly)
      *b Rear No. 1 Seat LH
      *c Rear No. 1 Seat Center
      *d Rear No. 1 Seat RH
      *e Rear No. 2 Seat LH
      *f Rear No. 2 Seat RH

      Check the rear seat belt warning function Click here.

      Result
      Result Proceed to
      The rear seat belt warning light (rear No. 1 seat LH) operation is not normal A
      The rear seat belt warning light (rear No. 1 seat center) operation is not normal B
      The rear seat belt warning light (rear No. 1 seat RH) operation is not normal C
      The rear seat belt warning light (rear No. 2 seat LH) operation is not normal D
      The rear seat belt warning light (rear No. 2 seat RH) operation is not normal E

    B

    READ VALUE USING GTS (REAR NO. 1 SEAT BELT CENTER BUCKLE SWITCH) Click here

    C

    READ VALUE USING GTS (REAR NO. 1 SEAT BELT RH BUCKLE SWITCH) Click here

    D

    READ VALUE USING GTS (REAR NO. 2 SEAT BELT LH BUCKLE SWITCH) Click here

    E

    READ VALUE USING GTS (REAR NO. 2 SEAT BELT RH BUCKLE SWITCH) Click here

    A

  6. READ VALUE USING GTS (REAR NO. 1 SEAT BELT LH BUCKLE SWITCH)


    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.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (L) Rear No. 1 seat belt LH buckle switch signal/ON or OFF

      ON: Rear No. 1 seat belt LH not fastened

      OFF: Rear No. 1 seat belt LH fastened

      		 -
      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

    REPLACE METER CIRCUIT PLATE Click here

    A

  7. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH - BODY GROUND)


    1. Disconnect the L27 meter circuit plate connector.

    2. Disconnect the R35 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
      L27-38 (RLSB) - R35-1 (LBR+) Always Below 1 Ω
      L27-38 (RLSB) - Body ground Always 10 kΩ or higher
      R35-2 (LBR-) - Body ground Always Below 1 Ω

    OK

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. READ VALUE USING GTS (REAR NO. 1 SEAT BELT CENTER BUCKLE SWITCH)


    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.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (C) Rear No. 1 seat belt center buckle switch signal/ON or OFF

      ON: Rear No. 1 seat belt center not fastened

      OFF: Rear No. 1 seat belt center fastened

      		 -
      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

    REPLACE METER CIRCUIT PLATE Click here

    A

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


    1. Disconnect the L27 meter circuit plate connector.

    2. Disconnect the R36 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
      L27-37 (RCSB) - R36-1 (CBR+) Always Below 1 Ω
      L27-37 (RCSB) - Body ground Always 10 kΩ or higher
      R36-2 (CBR-) - Body ground Always Below 1 Ω

    OK

    REPLACE REAR SEAT INNER BELT ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. READ VALUE USING GTS (REAR NO. 1 SEAT BELT RH BUCKLE SWITCH)


    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.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (R) Rear No. 1 seat belt RH buckle switch signal/ON or OFF

      ON: Rear No. 1 seat belt RH not fastened

      OFF: Rear No. 1 seat belt RH fastened

      		 -
      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

    REPLACE METER CIRCUIT PLATE Click here

    A

  11. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH - BODY GROUND)


    1. Disconnect the L27 meter circuit plate connector.

    2. Disconnect the S28 rear seat 3 point type belt assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-36 (RRSB) - S28-1 (RBR+) Always Below 1 Ω
      L27-36 (RRSB) - Body ground Always 10 kΩ or higher
      S28-2 (RBR-) - Body ground Always Below 1 Ω

    OK

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. READ VALUE USING GTS (REAR NO. 2 SEAT BELT LH BUCKLE SWITCH)


    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.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      3rd-Row Seatbelt Buckle (L) Rear No. 2 seat belt LH buckle switch signal/ON or OFF

      ON: Rear No. 2 seat belt LH not fastened

      OFF: Rear No. 2 seat belt LH fastened

      		 -
      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

    REPLACE METER CIRCUIT PLATE Click here

    A

  13. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - REAR NO. 2 SEAT INNER BELT ASSEMBLY LH - BODY GROUND)


    1. Disconnect the L27 meter circuit plate connector.

    2. Disconnect the S29 rear No. 2 seat inner belt assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-40 (RLBT) - S29-3 (+) Always Below 1 Ω
      L27-40 (RLBT) - Body ground Always 10 kΩ or higher
      S29-2 (E) - Body ground Always Below 1 Ω

    OK

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. READ VALUE USING GTS (REAR NO. 2 SEAT BELT RH BUCKLE SWITCH)


    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.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      3rd-Row Seatbelt Buckle (R) Rear No. 2 seat belt RH buckle switch signal/ON or OFF

      ON: Rear No. 2 seat belt RH not fastened

      OFF: Rear No. 2 seat belt RH fastened

      		 -
      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

    REPLACE METER CIRCUIT PLATE Click here

    A

  15. CHECK HARNESS AND CONNECTOR (METER CIRCUIT PLATE - REAR NO. 2 SEAT INNER BELT ASSEMBLY RH - BODY GROUND)


    1. Disconnect the L27 meter circuit plate connector.

    2. Disconnect the S29 rear No. 2 seat inner belt assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-39 (RRBT) - S29-1 (+) Always Below 1 Ω
      L27-39 (RRBT) - Body ground Always 10 kΩ or higher
      S29-4 (E) - Body ground Always Below 1 Ω

    OK

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR