SEAT BELT WARNING SYSTEM (w/o Occupant Classification System) Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

The combination meter assembly blinks or turns off the seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly (for driver).

WIRING DIAGRAM

B000LBNE01

INSPECTION PROCEDURE

Note

The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the communication system by checking communication function of the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure Click here.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    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
      D Seat Buckle SW Driver seat belt buckle switch/ON or OFF

      ON: Driver seat belt unfastened

      OFF: Driver seat belt fastened

      		 -
      OK
      ON or OFF appears on the tester screen according to the driver seat belt condition.

    NG

    INSPECT FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER) Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Combination Meter /Active Test.

    5. Perform the Active Test according to the display on the intelligent tester.

      Combination Meter (Combination Meter Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Driver Side Seat Belt Seat belt warning light OFF/ON -
      OK
      The seat belt warning light on the combination meter assembly operates normally.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

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

  3. INSPECT FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER)


    1. B000H9TE04
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Inner Belt Assembly (for Driver))

      Remove the front seat inner belt assembly (for driver) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 3 Driver seat belt unfastened Below 1 Ω
      2 - 3 Driver seat belt fastened 10 kΩ or higher

    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (FOR DRIVER) Click here

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the main body ECU (multiplex network body ECU) Click here.

      B000NBDE01
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Disconnect the 3C instrument panel junction block assembly. (for LHD)

    3. Disconnect the 3A instrument panel junction block assembly. (for RHD)

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      MB-18 (DBKL) - 3C-35 Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      MB-18 (DBKL) - 3A-38 Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3C-35 - N2-3 Always Below 1 Ω
      N2-3 - Body ground Always 10 kΩ or higher
      N2-2 - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      3A-38 - O3-3 Always Below 1 Ω
      O3-3 - Body ground Always 10 kΩ or higher
      O3-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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