SEAT BELT WARNING SYSTEM Rear Seat Belt Warning Light Malfunction

DESCRIPTION

When a rear door is opened and closed (the rear door courtesy light switch turns on and off) with the ignition switch ON, or when the ignition switch is turned from off to ON, the rear seat belt warning light in the telltale light assembly turns on to inform the driver of the rear seat belt condition. If a rear seat belt is fastened or unfastened, the warning light changes to indicate the current rear seat belt condition.

WIRING DIAGRAM

A005JQQE02

Note

Since the seat belt warning system has functions that use CAN communication, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with How to Proceed with Troubleshooting. Then conduct the following troubleshooting procedure.

CAUTION / NOTICE / HINT

Tech Tips

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


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


    1. Check the Data List for proper functioning of the rear door courtesy light switch Click here.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RL Door Courtesy SW Rear door LH courtesy light switch signal / ON or OFF

      ON: Rear door LH open

      OFF: Rear door LH closed

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

      ON: Rear door RH open

      OFF: Rear door RH closed

      		 -
      OK
      The display is as specified in the normal condition column.

    NG

    INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (REAR SEAT BELT BUCKLE SWITCH)


    1. Check the Data List for proper functioning of the rear seat belt buckle switch Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      2nd-Row Seatbelt Buckle (R) Rear seat belt buckle RH signal / ON or OFF

      ON: Rear seat belt RH fastened

      OFF: Rear seat belt RH unfastened

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

      ON: Rear seat belt LH fastened

      OFF: Rear seat belt LH unfastened

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

      ON: Rear seat center belt fastened

      OFF: Rear seat center belt unfastened

      		 -
      OK
      The display is as specified in the normal condition column.

    NG

    INSPECT REAR SEAT INNER BELT ASSEMBLY Click here

    OK

  3. INSPECT TELLTALE LIGHT ASSEMBLY


    1. Remove the telltale light assembly Click here.

    2. Inspect the telltale light assembly Click here.


    NG

    REPLACE TELLTALE LIGHT ASSEMBLY

    OK

  4. CHECK HARNESS AND CONNECTOR (TELLTALE LIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. Disconnect the F1 combination meter assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F1-1 (RLMT) - F21-8 (RLID) Always Below 1 Ω
      F1-2 (RCMT) - F21-7 (RCID) Always Below 1 Ω
      F1-3 (RRMT) - F21-6 (RRID) Always Below 1 Ω
      F21-16 (MSW2) - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F21-8 (RLID) - Body ground Always 10 kΩ or higher
      F21-7 (RCID) - Body ground Always 10 kΩ or higher
      F21-6 (RRID) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK TELLTALE LIGHT ASSEMBLY (REAR SEAT BELT WARNING LIGHT SOURCE VOLTAGE)

    A005JUHE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Telltale Light Assembly)

    1. Connect the F1 combination meter assembly connector to the combination meter assembly.

    2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F21-1 (LAPB) - Body ground Ignition switch ON 11 to 14 V

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY


    1. Remove the rear door courtesy light switch assembly Click here.

    2. Inspect the rear door courtesy light switch assembly Click here.


    NG

    REPLACE REAR DOOR COURTESY LIGHT SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (REAR DOOR COURTESY LIGHT SWITCH - MAIN BODY ECU)


    1. for LH:


      1. Disconnect the K3 rear door courtesy light switch assembly LH connector.

      2. Disconnect the F76 main body ECU (multiplex network body ECU) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K3-1 - F76-6 (LRCY) Always Below 1 Ω

    2. for RH:


      1. Disconnect the K4 rear door courtesy light switch assembly RH connector.

      2. Disconnect the F76 main body ECU (multiplex network body ECU) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K4-1 - F76-6 (LRCY) Always Below 1 Ω

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. INSPECT REAR SEAT INNER BELT ASSEMBLY


    1. Remove the rear seat inner belt assembly Click here.

    2. Inspect the rear seat inner belt assembly Click here.


    NG

    REPLACE REAR SEAT INNER BELT ASSEMBLY Click here

    OK

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


    1. for LH:


      1. Disconnect the K14 rear seat inner with center belt assembly connector.

      2. Disconnect the F1 combination meter assembly connector.

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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        K14-1 - F1-24 (RLSB) Always Below 1 Ω
        K14-2 - Body ground Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        K14-1 - Body ground Always 10 kΩ or higher

    2. for Center:


      1. Disconnect the K16 rear seat inner with center belt assembly connector.

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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        K16-1 - F1-25 (RCSB) Always Below 1 Ω
        K16-2 - Body ground Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        K16-1 - Body ground Always 10 kΩ or higher

    3. for RH:


      1. Disconnect the K15 rear seat inner belt assembly RH connector.

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

        Standard Resistance (Check for Open)
        Tester Connection Condition Specified Condition
        K15-1 - F1-26 (RRSB) Always Below 1 Ω
        K15-2 - Body ground Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        K15-1 - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR