OCCUPANT CLASSIFICATION SYSTEM Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

The occupant classification system detects the front passenger seat condition. It then displays the front passenger airbag condition (activated/not activated) using the passenger airbag ON/OFF indicator.

Tech Tips

Approximately 6 seconds after the power switch is turned to ON, the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the conditions listed below.

Front Passenger Seat Condition Passenger Airbag ON/OFF Indicator SRS Warning Light
ON Indicator OFF Indicator
Vacant Off On Off
Adult is seated. On Off Off
Child is seated. Off On Off
Child restraint system is installed.
Occupant classification system failure Off On On

CAUTION / NOTICE / HINT

Note


  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

    Click here

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

PROCEDURE


  1. CHECK SRS WARNING LIGHT


    1. Turn the power switch on (IG), and check the SRS warning light condition.

      Tech Tips

      If passenger airbag ON/OFF indicator trouble occurs, the SRS warning light does not illuminate. If the light comes on, a DTC is stored. Troubleshoot for the DTC.

      OK
      After the primary check period, the SRS warning light goes off.

      Tech Tips

      The primary check is performed for approximately 6 seconds after the power switch is turned to on (IG).

      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIRBAG SYSTEM Click here

    OK

  2. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK


    1. Using the GTS, perform zero point calibration and sensitivity check.

      Click here


      Body Electrical > Occupant Detection > Utility
      Tester Display
      Zero Point Calibration & Sensitivity Check
      OK
      "Zero Point Calibration & Sensitivity Check is complete." is displayed.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  3. RETIGHTEN FRONT SEAT ASSEMBLY RH BOLT


    1. Loosen the 4 installation bolts of the front seat assembly RH.

      Click here

    2. Tighten the 4 installation bolts of the front seat assembly RH to the specified torque.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK


    1. Using the GTS, perform zero point calibration and sensitivity check.

      Click here


      Body Electrical > Occupant Detection > Utility
      Tester Display
      Zero Point Calibration & Sensitivity Check
      OK
      "Zero Point Calibration & Sensitivity Check is complete." is displayed.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  5. READ VALUE USING GTS


    1. Using the GTS, read the Data List.

      Click here


      1. Read the display when the front passenger side buckle switch is operated.


        Body Electrical > Occupant Detection > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Passenger Buckle SW Front seat belt assembly RH buckle switch Set/Unset/NG

        Set: The front seat belt assembly RH is fastened

        Unset: The front seat belt assembly RH is not fastened

        NG: Data is not determined

        		 -

        Body Electrical > Occupant Detection > Data List
        Tester Display
        Passenger Buckle SW
        OK
        The GTS display changes correctly in accordance with the operation of the buckle switch.
      Result
      Result
      OK
      NG

    NG

    CHECK CONNECTORS Click here

    OK

  6. CHECK CONNECTORS


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

    3. Disconnect the connectors from the occupant detection ECU, front and rear occupant classification sensor LH.

    4. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Result
      OK
      NG

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

  7. REPLACE OCCUPANT DETECTION ECU


    1. Connect the connectors to the front and rear occupant classification sensor LH.

    2. Replace the occupant detection ECU.

      Click here

    3. Connect the cable to the negative (-) auxiliary battery terminal.

      Result
      Proceed to
      NEXT

    NEXT

  8. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK


    1. Using the GTS, perform zero point calibration and sensitivity check.

      Click here


      Body Electrical > Occupant Detection > Utility
      Tester Display
      Zero Point Calibration & Sensitivity Check
      Result
      Proceed to
      NEXT

    NEXT

    END (OCCUPANT DETECTION ECU WAS DEFECTIVE)

  9. CHECK CONNECTORS


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

    3. Disconnect the connectors from the occupant detection ECU and front seat inner belt assembly RH.

    4. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Result
      OK
      NG

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

  10. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH


    1. Connect the connector to the occupant detection ECU.

    2. Replace the front seat inner belt assembly RH.

      Click here

    3. Connect the cable to the negative (-) auxiliary battery terminal.

      Result
      Proceed to
      NEXT

    NEXT

  11. PERFORM ZERO POINT CALIBRATION AND SENSITIVITY CHECK


    1. Using the GTS, perform zero point calibration and sensitivity check.

      Click here


      Body Electrical > Occupant Detection > Utility
      Tester Display
      Zero Point Calibration & Sensitivity Check
      Result
      Proceed to
      NEXT

    NEXT

    END (FRONT SEAT INNER BELT ASSEMBLY RH WAS DEFECTIVE)