Click here

SEAT BELT WARNING SYSTEM Rear Seat Belt Warning Light Malfunction

Click here
Click here
DTC Code DTC Name
  Rear Seat Belt Warning Light Malfunction
Click here

DESCRIPTION

The main body ECU (multiplex network body ECU) detects whether either front door is open or closed based on the condition of the left and right courtesy light switches and then sends the front door status signal to the combination meter assembly. The combination meter assembly detects the rear seat belt state. The rear seat belt warning lights on the air conditioning control assembly illuminate or turn off in accordance with the front door state, vehicle speed and rear seat belt state.

B0066XRE01
Table 1.
*a Front Door Courtesy Light Switch Assembly (for RH)
*b Front Door Courtesy Light Switch Assembly (for LH)
*c Main Body ECU (Multiplex Network Body ECU)
*d CAN Communication Line
Click here

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note:

  • The seat belt warning system uses the CAN communication system. First, confirm that there are no malfunctions 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.

Click here

PROCEDURE


  1. Click here

    READ VALUE USING GTS (DOOR COURTESY LIGHT 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 / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      1. Body Electrical > Main Body > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        FR Door Courtesy SW Front door courtesy light switch RH* ON or OFF

        ON: Front door RH open

        OFF: Front door RH closed

        		 -
        FL Door Courtesy SW Front door courtesy light switch LH* ON or OFF

        ON: Front door LH open

        OFF: Front door LH closed

        		 -




      1. Body Electrical > Main Body > Data List
        Tester Display
        FR Door Courtesy SW
        FL Door Courtesy SW





      OK
      The GTS display changes correctly in response to the door condition.
      Result
      Proceed to
      OK
      NG

  2. Click here

    CHECK REAR SEAT BELT WARNING


    1. B00652YC01
      *1 Rear Seat Belt Warning Light (Air Conditioning Control 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

  3. Click here

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the O64 air conditioning control assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O64-8 (IG+) - Body ground Engine switch on (IG) 11 to 14 V
      O64-8 (IG+) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. Reconnect the O64 air conditioning control assembly connector.

    2. Disconnect the O3 combination meter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O3-35 (RLMT) - Body ground Engine switch on (IG) 11 to 14 V
      O3-37 (RRMT) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Temporarily replace the air conditioning control assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

  6. Click here

    CHECK REAR SEAT BELT WARNING


    1. B00652YC01
      *1 Rear Seat Belt Warning Light (Air Conditioning Control Assembly)
      *a LH
      *b RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning lights (all seats) operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

    • NG

      REPLACE COMBINATION METER ASSEMBLYClick here

  7. Click here

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


    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.


      1. 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

        		 -



      1. 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

  8. Click here

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


    1. Disconnect the O3 combination meter assembly connector.

    2. Disconnect the U22 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
      O3-12 (RRSB) - U22-1 (RBR+) Always Below 1 Ω
      O3-12 (RRSB) or U22-1 (RBR+) - Body ground Always 10 kΩ or higher
      U22-2 (RBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE REAR SEAT INNER BELT ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the O3 combination meter assembly connector.

    2. Disconnect the O64 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O3-37 (RRMT) - O64-2 (RRID)*1 Always Below 1 Ω
      O3-37 (RRMT) - O64-1 (RRID)*2 Always Below 1 Ω
      O3-37 (RRMT) or O64-2 (RRID)*1 - Body ground Always 10 kΩ or higher
      O3-37 (RRMT) or O64-1 (RRID)*2 - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Temporarily replace the air conditioning control assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

  11. Click here

    CHECK REAR SEAT BELT WARNING


    1. B00652YC01
      *1 Rear Seat Belt Warning Light (Air Conditioning Control Assembly)
      *a LH
      *b RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning lights (RH) operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

    • NG

      REPLACE COMBINATION METER ASSEMBLYClick here

  12. Click here

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


    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.


      1. 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

        		 -



      1. 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

  13. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - REAR NO. 1 SEAT INNER BELT ASSEMBLY LH - BODY GROUND)


    1. Disconnect the O3 combination meter assembly connector.

    2. Disconnect the U20 rear No. 1 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
      O3-14 (RLSB) - U20-1 (LBR+) Always Below 1 Ω
      O3-14 (RLSB) or U20-1 (LBR+) - Body ground Always 10 kΩ or higher
      U20-2 (LBR-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE REAR NO. 1 SEAT INNER BELT ASSEMBLY LHClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the O3 combination meter assembly connector.

    2. Disconnect the O64 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O3-35 (RLMT) - O64-3 (RLID)*1 Always Below 1 Ω
      O3-35 (RLMT) - O64-2 (RLID)*2 Always Below 1 Ω
      O3-35 (RLMT) or O64-3 (RLID)*1 - Body ground Always 10 kΩ or higher
      O3-35 (RLMT) or O64-2 (RLID)*2 - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. Click here

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Temporarily replace the air conditioning control assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

  16. Click here

    CHECK REAR SEAT BELT WARNING


    1. B00652YC01
      *1 Rear Seat Belt Warning Light (Air Conditioning Control Assembly)
      *a LH
      *b RH

      Check the rear seat belt warning function.

      Click here

      OK
      The rear seat belt warning lights (LH) operate normally.
      Result
      Proceed to
      OK
      NG

    • OK

      END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

    • NG

      REPLACE COMBINATION METER ASSEMBLYClick here