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 instrument panel passenger airbag assembly and front seat cushion airbag assembly RH condition (activated/not activated) using the passenger airbag ON/OFF indicator.

Tech Tips

Approximately 6 seconds after the power switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.

Front Passenger Seat Condition Passenger Airbag ON/OFF Indicator SRS Warning Light
ON Indicator OFF Indicator
Vacant OFF ON OFF
Adult*1 is seated ON OFF OFF
Child*2 is seated ON or OFF*2 OFF or ON*2 OFF
Child restraint system is installed OFF ON OFF
Occupant classification system failure OFF ON ON

CAUTION / NOTICE / HINT

Note


  • 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

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

PROCEDURE


  1. CHECK SRS WARNING LIGHT


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

      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 on (IG).

      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIRBAG SYSTEM Click here

    OK

  2. PERFORM ZERO POINT CALIBRATION


    1. Using the GTS, perform Zero Point Calibration.

      Click here


      Body Electrical > Occupant Detection > Utility
      Tester Display
      Zero Point Calibration
      OK
      "Zero Point Calibration 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.

    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


    1. Using the GTS, perform Zero Point Calibration.

      Click here


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

    OK

    END

    NG

  5. READ VALUE USING GTS


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Occupant Detection / Data List.

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


      Body Electrical > Occupant Detection > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Passenger Buckle SW Passenger side buckle switch NG, Set or Unset

      Set: Front passenger seat belt is fastened

      Unset: Front passenger seat belt is not fastened

      		 "NG" will be displayed immediately after the power switch is turned on.

      Body Electrical > Occupant Detection > Data List
      Tester Display
      Passenger Buckle SW
      OK
      The GTS display changes correctly in accordance with the operation of the passenger side buckle switch.
      Result
      Proceed to
      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 occupant classification sensor LH and rear occupant classification sensor LH.

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

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

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

  7. REPLACE OCCUPANT DETECTION ECU


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


    1. Using the GTS, perform Zero Point Calibration.

      Click here


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

    NEXT

    END

  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 deformed or damaged.

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

    NG

    REPLACE FRONT SEAT WIRE RH

    OK

  10. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH


    1. Turn the power switch off.

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

    3. Replace the front seat inner belt assembly RH.

      Click here

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

      Result
      Proceed to
      NEXT

    NEXT

  11. PERFORM ZERO POINT CALIBRATION


    1. Using the GTS, perform Zero Point Calibration.

      Click here


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

    NEXT

    END