SEAT BELT WARNING SYSTEM Driver Side Seat Belt Warning Light does not Operate

DTC Code DTC Name
Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

When the ignition switch is turned to ON, the main body ECU transmits front seat inner belt LH*1 (or RH*2) state signals to the combination meter through the CAN. If the driver seat belt is not fastened, the combination meter blinks the driver side seat belt warning light. If the seat belt is fastened, the warning light goes off.

  • *1: for LHD

  • *2: for RHD

WIRING DIAGRAM

C199304E09

PROCEDURE

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

    1. Check if a CAN communication system DTC is output.

      Table 1. Result

      Result

      Proceed to

      DTC is not output

      A

      CAN system DTC is output

      B

    GO TO CAN COMMUNICATION SYSTEM

    (Click here)

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT WARNING LIGHT)

    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the driver side seat belt warning light turns on/off (Click here).

      Table 2. Combination Meter

      Item

      Test Part

      Control Range

      Diagnostic Note

      Driver Side Seat Belt

      Driver side seat belt warning light

      ON/OFF

      Confirm that the vehicle is stopped and the engine is idling.

      OK

      Driver side seat belt warning light condition can be switched by Active Test.

    REPLACE COMBINATION METER

    (Click here)

  3. READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT BUCKLE SWITCH)

    1. Check the Data List for proper functioning of the driver side seat belt buckle switch (Click here).

      Table 3. Main Body

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      D Seat Buckle SW

      Driver side seat belt buckle signal / ON or OFF

      ON: Driver side seat belt fastened

      OFF: Driver side seat belt unfastened

      -

      OK

      The display is as specified in the normal condition column.

    USE SIMULATION METHOD TO CHECK

    (Click here)

  4. INSPECT FRONT SEAT INNER BELT ASSEMBLY

    1. C197119E05

      Remove the front seat inner belt (Click here).

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (+) - 1 (E)

      Driver side seat belt fastened

      10 kΩ or higher

      Driver side seat belt unfastened

      Below 1 Ω

    REPLACE FRONT SEAT INNER BELT ASSEMBLY

    (Click here)

  5. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - MAIN BODY ECU AND BODY GROUND)

    1. U122709E01

      Disconnect the N7*1 or O4*2 front seat inner belt connector.

      • *1: for LHD

      • *2: for RHD

    2. Disconnect the H79 ECU connector.

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

      Standard Resistance

      Table 4. for LHD

      Tester Connection

      Condition

      Specified Condition

      N7-2 (+) - H79-26 (DBKL)

      Always

      Below 1 Ω

      N7-1 (E) - Body ground

      N7-2 (+) - Body ground

      Always

      10 kΩ or higher
      Table 5. for RHD

      Tester Connection

      Condition

      Specified Condition

      O4-2 (+) - H79-26 (DBKL)

      Always

      Below 1 Ω

      O4-1 (E) - Body ground

      O4-2 (+) - Body ground

      Always

      10 kΩ or higher
      Table 6. Text in Illustration

      *1

      for LHD

      *2

      for RHD

      *3

      Front view of wire harness connector

      (to Front Seat Inner Belt)

      *4

      Front view of wire harness connector

      (to Main Body ECU)

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    REPAIR OR REPLACE HARNESS OR CONNECTOR