SEAT BELT WARNING SYSTEM(w/o 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 combination meter assembly illuminates or turns off in accordance with the rear door state, vehicle speed and rear seat belt state.

WIRING DIAGRAM

A003NCEE09

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.


      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
      ON or OFF appears on the GTS screen according 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. A003NBVC02
      *1 Rear Seat Belt Warning Light (Combination Meter Assembly)
      *a LH
      *b 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 (LH) does not operate normally D

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE METER CIRCUIT PLATE Click here

    D

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

    C

  3. READ VALUE USING GTS (REAR SEAT BELT BUCKLE SWITCH (FOR RH))


    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.


      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

    REPLACE METER CIRCUIT PLATE Click here

    A

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


    1. Disconnect the I6 meter circuit plate connector.

    2. Disconnect the N23 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
      I6-10 (RRSB) - N23-5 (RBR+) Always Below 1 Ω
      I6-10 (RRSB) or N23-5 (RBR+) - Body ground Always 10 kΩ or higher
      N23-4 (RBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    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.


      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

    REPLACE METER CIRCUIT PLATE Click here

    A

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


    1. Disconnect the I6 meter circuit plate connector.

    2. Disconnect the N24 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
      I6-12 (RLSB) - N24-5 (LBR+) Always Below 1 Ω
      I6-12 (RLSB) or N24-5 (LBR+) - Body ground Always 10 kΩ or higher
      N24-4 (LBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT 3 POINT TYPE BELT ASSEMBLY OUTER LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR