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 is shown on the multi-information display in the combination meter assembly. The main body ECU (multiplex network body ECU) detects whether any of the rear doors are open or closed based on the courtesy switch condition and then sends the rear door status signal to the combination meter assembly. The rear seat inner belt assembly detects whether the seat belt is fastened or unfastened based on each buckle switch condition and then sends the seat belt status signal to the combination meter assembly. When the combination meter assembly detects that any courtesy switch is turned off while the power switch is on (IG), or that any courtesy switch is turned off and then the power switch is turned on (IG), the combination meter assembly shows the rear seat belt warning on the multi-information display. Then the combination meter assembly shows the current status of the rear seat belts according to each buckle switch condition.

WIRING DIAGRAM

A01JB5HE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK REAR SEAT BELT WARNING


    1. Turn the power switch off and lock all doors.

    2. Unlock all doors and turn the power switch on (IG).

    3. Open and close the rear RH door. Then, check that the multi-information display on the combination meter assembly displays the rear seat belt warning.

      OK
      The rear seat belt warning is displayed.

    4. Turn the power switch off and lock all doors.

    5. Unlock all doors and turn the power switch on (IG).

    6. Open and close the rear LH door. Then, check that the multi-information display on the combination meter assembly displays the rear seat belt warning.

      OK
      The rear seat belt warning is displayed.

    7. Turn the power switch off and lock all doors.

    8. Unlock all doors and turn the power switch on (IG). Then, check that the multi-information display on the combination meter assembly does not display the rear seat belt warning.

      OK
      The rear seat belt warning is not displayed.

    NG

    READ VALUE USING INTELLIGENT TESTER (REAR DOOR COURTESY SWITCH) Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE 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 / 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 side seat belt buckle switch signal/ON or OFF

      ON: Rear RH side seat belt fastened.

      OFF: Rear RH side seat belt not fastened.

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

      ON: Rear LH side seat belt fastened.

      OFF: Rear LH side seat belt not fastened.

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

      ON: Rear center seat belt fastened.

      OFF: Rear center seat belt not fastened.

      		 -
      OK
      ON or OFF appears on the tester screen according to the rear seat belt condition.
      Result
      Result Proceed to
      OK or NG (for all buckle switches) A
      NG (for rear RH side buckle switch) B
      NG (for rear center buckle switch) C
      NG (for rear LH side buckle switch) D
      NG (for rear Center and LH side buckle switches) E

    B

    INSPECT REAR SEAT INNER BELT ASSEMBLY (RH SIDE) Click here

    C

    INSPECT REAR SEAT INNER BELT ASSEMBLY (CENTER) Click here

    D

    INSPECT REAR SEAT INNER BELT ASSEMBLY (LH SIDE) Click here

    E

    CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT (LH SIDE AND CENTER) - BODY GROUND) Click here

    A

    REPLACE NO. 3 METER CIRCUIT PLATE Click here

  3. READ VALUE USING INTELLIGENT TESTER (REAR DOOR COURTESY 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 switch signal/ON or OFF

      ON: Rear door LH or RH open.

      OFF: Rear door LH and RH closed.

      		 -
      RL Door Courtesy SW Rear door courtesy 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

  4. REPLACE NO. 3 METER CIRCUIT PLATE


    1. Replace the No. 3 meter circuit plate Click here.


    NEXT

  5. CHECK REAR SEAT BELT WARNING


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

      OK
      The rear seat belt warning function operates normally.

    NG

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

    OK

    END (NO. 3 METER CIRCUIT PLATE WAS DEFECTIVE)

  6. INSPECT REAR SEAT INNER BELT ASSEMBLY (RH SIDE)


    1. A01JC87E05
      Text in Illustration
      *1

      Component without harness connected

      (Rear Seat Inner Belt Assembly (RH Side))

      Remove the rear seat inner belt assembly RH Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (RBR+) - 2 (E) Rear seat belt RH fastened Below 1 Ω
      1 (RBR+) - 2 (E) Rear seat belt RH not fastened 10 kΩ or higher

    NG

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

    OK

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


    1. A01JCD0E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)
      *2

      Front view of wire harness connector

      (to Rear Seat Inner Belt Assembly (RH Side))

      Disconnect the L27 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-32 (RRSB) - R22-1 (RBR+) Always Below 1 Ω
      L27-32 (RRSB) - Body ground Always 10 kΩ or higher
      R22-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 3 METER CIRCUIT PLATE Click here

  8. INSPECT REAR SEAT INNER BELT ASSEMBLY (CENTER)


    1. A01JBGQE01
      Text in Illustration
      *1

      Component without harness connected

      (Rear Seat Inner Belt Assembly (LH Side and Center))

      Remove the rear seat inner belt assembly (LH Side and Center) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (CBR+) - 2 (E) Rear seat belt center fastened Below 1 Ω
      1 (CBR+) - 2 (E) Rear seat belt center not fastened 10 kΩ or higher

    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY (LH SIDE AND CENTER) Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT CENTER - COMBINATION METER)


    1. A01J927E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)
      *2

      Front view of wire harness connector

      (to Rear Seat Inner Belt Assembly (LH Side and Center))

      Disconnect the L27 meter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-33 (RCSB) - R21-1 (CBR+) Always Below 1 Ω
      L27-33 (RCSB) - Body ground Always 10 kΩ or higher
      R21-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 3 METER CIRCUIT PLATE Click here

  10. INSPECT REAR SEAT INNER BELT ASSEMBLY (LH SIDE)


    1. A01JC87E04
      Text in Illustration
      *1

      Component without harness connected

      (Rear Seat Inner Belt Assembly (LH Side and Center))

      Remove the rear seat inner belt assembly (LH Side and Center) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (LBR+) - 2 (E) Rear seat inner belt LH fastened Below 1 Ω
      1 (LBR+) - 2 (E) Rear seat belt LH not fastened 10 kΩ or higher

    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY (LH SIDE AND CENTER) Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT CENTER - COMBINATION METER)


    1. A01JCD0E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)
      *2

      Front view of wire harness connector

      (to Rear Seat Inner Belt Assembly (LH Side and Center))

      Disconnect the L27 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-34 (RLSB) - R20-1 (LBR+) Always Below 1 Ω
      L27-34 (RLSB) - Body ground Always 10 kΩ or higher
      R20-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 3 METER CIRCUIT PLATE Click here

  12. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT (LH SIDE AND CENTER) - BODY GROUND)


    1. A01JCZBE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Rear Seat Inner Belt Assembly (LH Side))
      *2

      Front view of wire harness connector

      (to Rear Seat Inner Belt Assembly (Center))

      Disconnect the R21 and R20 connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R21-2 (E) - Body ground Always Below 1 Ω
      R20-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 3 METER CIRCUIT PLATE Click here