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Home >> Toyota >> 2005 >> Avalon XLS >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> On-Vehicle Inspection

On-Vehicle Inspection

CAUTION: Be sure to perform the initialization of the occupant classification ECU if any of the following conditions occur (see INITIALIZATION ). If the initialization is not performed, the SRS may not operate properly.
  • The occupant classification ECU is replaced.
  • Accessories (seatback tray, seat cover, etc.) are installed to the vehicle.
  • The passenger seat is removed from the vehicle, and then reinstalled or replaced.
  • The passenger airbag ON/OFF indicator light ("OFF") comes on when the passenger seat is not occupied.
  • The vehicle is brought to the workshop for repair due to an accident or collision.
  1. HORN BUTTON ASSY (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the horn button assy installed on the vehicle, perform a visual check. If there are any defects as mentioned below, replace the horn button assy with a new one: Cuts, minute cracks or marked discoloration on the horn button assy top surface or in the grooved portion.
      Fig 1: Identifying Horn Button
      G02972512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. HORN BUTTON ASSY (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the horn button assy removed from the vehicle, perform a visual check. If there are any defects as mentioned below, replace the horn button assy or steering wheel assy with a new one:
      • Cuts, minute cracks or marked discoloration on the horn button assy top surface or in the grooved portion.
      • Cracks or other damage to the connectors.
      • Deformation of the steering wheel assy.
        Fig 2: Identifying Horn Button
        G02972513Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • Deformation of the horn button contact plate of the horn button assy.
        Fig 3: Identifying Horn Button Plate
        G02972514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • There should be no interference between the horn button assy and steering wheel assy, and the clearance should be uniform all the way around when the new horn button assy is installed on the steering wheel assy.
        CAUTION: For removal and installation procedures of the horn button assy, see REPLACEMENT . Be sure to follow the correct procedure.
        Fig 4: Identifying Horn Button And Steering Wheel Assy
        G02972515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. FRONT PASSENGER AIRBAG ASSY (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the front passenger airbag assy installed on the vehicle, perform a visual check. If there are any defects as mentioned below, replace the instrument panel with a new one:

      Cuts, minute cracks or marked discoloration on the instrument panel around the front passenger airbag assy.

      Fig 5: Identifying Front Passenger Airbag
      G02972516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. FRONT PASSENGER AIRBAG ASSY (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the front passenger airbag assy removed from the vehicle, perform a visual check. If there are any defects as mentioned below, replace the front passenger airbag assy, instrument panel or instrument panel reinforcement with a new one:
      • Cuts, minute cracks or marked discoloration on the front passenger airbag assy.
      • Cracks or other damage to the connectors.
        Fig 6: Removing Front Passenger Airbag
        G02972517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • Deformation or cracks on the instrument panel or instrument panel reinforcement.
        CAUTION: For removal and installation procedures of the front passenger airbag assy, see REPLACEMENT . Be sure to follow the correct procedure.
        Fig 7: Identifying Instrument Panel Reinforcement
        G02972518Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. FRONT SEAT AIRBAG ASSY (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the front seat airbag assy installed on the vehicle, perform a visual check. If there are any defects as mentioned below, replace the front seatback assy with a new one:

      Cuts, minute cracks or marked discoloration on the front seatback assy around the front seat airbag assy.

      Fig 8: Identifying Front Seat Airbag
      G02972519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. FRONT SEAT AIRBAG ASSY (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the front seat airbag assy removed from the vehicle, perform a visual check. If there are any defects as mentioned below, replace the front seat airbag assy with a new one:
      • Cuts, minute cracks or marked discoloration on the front seat airbag assy.
      • Cracks or other damage to the wire harness or connector.
        Fig 9: Seat Airbag
        G02972520Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        CAUTION: For removal and installation procedures of the front seat airbag assy, see OVERHAUL . Be sure to follow the correct procedure.
  7. CURTAIN SHIELD AIRBAG ASSY (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the curtain shield airbag assy installed on the vehicle, perform a visual check. If there are any defects as mentioned below, replace the front pillar garnish or roof headlining assy with a new one:

      Cuts, minute cracks or marked discoloration on the front pillar garnish or roof headlining assy around the curtain shield airbag assy.

      Fig 10: Installing Curtain Shield Airbag Assy
      G02972521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. CURTAIN SHIELD AIRBAG ASSY (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the curtain shield airbag assy removed from the vehicle, perform a visual check. If there are any defects as mentioned below, replace the curtain shield airbag assy with a new one:
      • Cuts, minute cracks or marked discoloration on the curtain shield airbag assy.
      • Cracks or other damage to the connector.
        CAUTION: For removal and installation procedures of the curtain shield airbag assy, see REPLACEMENT . Be sure to follow the correct procedure.
        Fig 11: Removing Curtain Shield Airbag Assy
        G02972522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSTRUMENT PANEL AIRBAG ASSY LOWER NO.1 (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the instrument panel airbag assy lower No.1 installed on the vehicle, perform a visual check including the following:

      Cuts, minute cracks or marked discoloration on the instrument panel airbag assy lower No.1.

      Fig 12: Identifying Instrument Panel Airbag Assy Lower No.1
      G02972523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. INSTRUMENT PANEL AIRBAG ASSY LOWER NO.1 (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. With the instrument panel airbag assy lower No.1 removed from the vehicle, perform a visual check. If there are any defects as mentioned below, replace the instrument panel airbag assy lower No.1 with a new one:
      • Cuts, minute cracks or marked discoloration on the instrument panel airbag assy lower No.1.
      • Cracks or other damage to the connector.
        Fig 13: Identifying Instrument Panel Airbag Assy Lower No.1
        G02972524Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • Deformation or cracks on the instrument panel reinforcement.
        CAUTION: For removal and installation procedures of the instrument panel airbag assy lower No.1, see REPLACEMENT . Be sure to follow the correct procedure.
        Fig 14: Identifying Instrument Panel Reinforcement
        G02972525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. AIRBAG SENSOR ASSY CENTER (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  12. AIRBAG SENSOR ASSY CENTER (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  13. AIRBAG SENSOR ASSY CENTER (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS DEPLOYED) 
    1. Replace the airbag sensor assy center (see REPLACEMENT ).
      CAUTION: For removal and installation procedures of the airbag sensor assy center, see REPLACEMENT . Be sure to follow the correct procedure.

      HINT:

      The airbag sensor assy center should be replaced after any of the airbags has deployed, as it has been subjected to the impact.

  14. AIRBAG SENSOR FRONT (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  15. AIRBAG SENSOR FRONT (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. When the front bumper of the vehicle or its area is damaged, check if there is any damage to the airbag sensor front. If any of the airbag sensor front have defects as mentioned below, replace it with a new one:
      • Cracks, dents or chips on the sensor housing.
      • Cracks or other damage to the connector.
      • Peeling off of the label or damage to the serial number.
      CAUTION: For removal and installation procedures of the airbag sensor front, see REPLACEMENT . Be sure to follow the correct procedure.
  16. AIRBAG SENSOR FRONT (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS DEPLOYED) 
    1. Replace the airbag sensor front (see REPLACEMENT ).
      CAUTION: For removal and installation procedures of the airbag sensor front, see REPLACEMENT . Be sure to follow the correct procedure.

      HINT:

      The airbag sensor front on the impacted side should be replaced after the horn button assy, front passenger airbag assy or instrument panel airbag assy lower No.1 has deployed.

  17. SIDE AIRBAG SENSOR ASSY (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  18. SIDE AIRBAG SENSOR ASSY (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. When the center pillar of the vehicle or its area is damaged, check if there is any damage to the side airbag sensor assy. If there are any defects as mentioned below, replace the side airbag sensor assy with a new one:
      • Cracks, dents or chips on the sensor housing.
      • Cracks or other damage to the connector.
      • Peeling off of the label or damage to the serial number.
      CAUTION: For removal and installation procedures of the side airbag sensor assy, see REPLACEMENT . Be sure to follow the correct procedure.
  19. SIDE AIRBAG SENSOR ASSY (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS DEPLOYED) 
    1. Replace the side airbag sensor assy (see REPLACEMENT ).
      CAUTION: For removal and installation procedures of the side airbag sensor assy, see REPLACEMENT . Be sure to follow the correct procedure.

      HINT:

      The side airbag sensor assy on the impacted side should be replaced after the front seat airbag assy and curtain shield airbag assy have deployed.

  20. AIRBAG SENSOR REAR (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  21. AIRBAG SENSOR REAR (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS NOT DEPLOYED) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. When the quarter panel of the vehicle or its area is damaged, check if there is any damage to the airbag sensor rear. If there are any defects as mentioned below, replace the airbag sensor rear with a new one:
      • Cracks, dents or chips on the sensor housing.
      • Cracks or other damage to the connector.
      • Peeling off of the label or damage to the serial number.
      CAUTION: For removal and installation procedures of the airbag sensor rear, see REPLACEMENT . Be sure to follow the correct procedure.
  22. AIRBAG SENSOR REAR (VEHICLE INVOLVED IN COLLISION AND AIRBAG HAS DEPLOYED) 
    1. Replace the airbag sensor rear (see REPLACEMENT ).
      CAUTION: For removal and installation procedures of the airbag sensor rear, see REPLACEMENT . Be sure to follow the correct procedure.

      HINT:

      The airbag sensor rear on the impacted side should be replaced after the curtain shield airbag assy has deployed.

  23. SEAT POSITION AIRBAG SENSOR (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  24. SEAT POSITION AIRBAG SENSOR (VEHICLE INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. Even if the airbag was not deployed, check if there is any damage to the seat position airbag sensor. If there are any defects as mentioned below, replace the seat position airbag sensor with a new one:
      • Cracks, dents or chips on the sensor housing.
      • Cracks or other damage to the connector.
      CAUTION: For removal and installation procedures of the seat position airbag sensor, see REPLACEMENT . Be sure to follow the correct procedure.
  25. OCCUPANT CLASSIFICATION ECU (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  26. OCCUPANT CLASSIFICATION ECU (VEHICLE INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. Even if the airbag was not deployed, check if there is any damage to the occupant classification ECU. If there are any defects as mentioned below, replace the occupant classification ECU with a new one:
      • Cracks, dents or chips on the sensor housing.
      • Cracks or other damage to the connectors.
      CAUTION: For removal and installation procedures of the occupant classification ECU, see REPLACEMENT . Be sure to follow the correct procedure.
  27. WIRE HARNESS AND CONNECTOR (VEHICLE NOT INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
  28. WIRE HARNESS AND CONNECTOR (VEHICLE INVOLVED IN COLLISION) 
    1. Perform a diagnostic system check (see DTC CHECK/CLEAR ).
    2. Check for breaks in all wires of the SRS wire harness and exposed conductors.
    3. Check to see if the SRS wire harness connectors are cracked or chipped.

      HINT:

      The SRS wire harness is integrated with the engine room main wire, instrument panel wire, instrument panel wire assy, floor wire and floor wire No.2.

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