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Occupant Classification Sensor: Removal

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Always wear safety glasses when repairing an air bag supplemental restraint system (SRS) vehicle and when handling an air bag module. This will reduce the risk of injury in the event of an accidental deployment.
WARNING: Do not separate components.
WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.
WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.
WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
WARNING: To reduce the risk of personal injury, do not use any memory saver devices.
CAUTION: It is necessary to rezero the OCS system when a front passenger seat cushion is disassembled, a new trim cover installed, or an OCS service kit is installed. A diagnostic tool is used to trigger the active command to carry out rezeroing of the OCS system.
NOTE: If a seat equipped with a seat mounted side air bag and/or a safety belt pretensioner (if equipped) system is being serviced, the supplemental restraint system (SRS) must be depowered. 
NOTE: The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
NOTE: Occupant classification sensor (OCS) system components (seat cushion foam pad, bladder with pressure sensor and electronic control unit) are calibrated to each other and are serviced as an assembly. The OCS system components are not to be installed separately. If a new OCS system, OCS system component or seat cushion foam pad are needed, a new OCS system service kit (seat cushion foam pad, bladder with pressure sensor and electronic control unit) must be installed as an assembly.
NOTE: To identify between a production OCS system and a service OCS system (OCS service kit) inspect the electronic control unit (ECU) electrical connector.  A production OCS system allows the disconnect of the ECU electrical connector. A service OCS system (OCS service kit) has the ECU electrical connector glued to the ECU, it cannot and should not be disconnected or altered.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: Repair is made by installing a new part only. If the new part does not correct the condition, install the original part and carry out the diagnostic procedure again.

    All vehicles 

  1. Remove the passenger seat and depower the system. For additional information, refer to SEATING .
  2. Remove the front seat backrest. For additional information, refer to SEATING .
  3. Remove the power seat track or manual seat track. For additional information, refer to SEATING .
    4. CAUTION: While positioning the seat cushion frame and occupant sensor assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
    Fig 1: Removing Trim Cover J-Clips
    G03959696Courtesy of FORD MOTOR CO.
  4. Release the trim cover J-clips.

    5. Vehicles with an original equipment occupant classification sensor (OCS) 

  5. Remove the seat cushion pan and OEM occupant classification sensor (OCS) from the foam pad and trim cover.
    Fig 2: Removing Seat Cushion Pan And OEM Occupant Classification Sensor From Foam Pad And Trim Cover
    G03959697Courtesy of FORD MOTOR CO.
    6. CAUTION: Use care when separating the seat upholstery from the hook-and-loop strip, or the hook-and-loop strip can be torn from the seat cushion foam pad.
    Fig 3: Removing Seat Cushion Trim Cover From Foam Pad
    G03959698Courtesy of FORD MOTOR CO.
  6. If installing a new OCS or trim cover, release the hook-and-loop strips and remove the seat cushion trim cover from the foam pad.
  7. Remove the pin-type retainers.
    Fig 4: Removing Pin-Type Retainers
    G03959699Courtesy of FORD MOTOR CO.
  8. Separate the pressure sensor from the bracket.
    1. Bend and release the retaining tab (not shown) holding the pressure sensor in place.
    2. Slide the pressure sensor off the bracket.
    3. Disconnect the electrical connector.
    Fig 5: Removing Pressure Sensor From Bracket
    G03959700Courtesy of FORD MOTOR CO.
    9. NOTE: Make note of the opening that the pressure sensor and hose are being fed through on the seat cushion support assembly for installation purposes.
    Fig 6: Removing OCS Bladder And Pressure Sensor From Seat Cushion Frame
    G03959701Courtesy of FORD MOTOR CO.
  9. Separate the OCS bladder and pressure sensor from the seat cushion frame
    • Feed the pressure sensor and hose through the seat cushion support assembly.
  10. Remove the electronic control unit (ECU) from the seat cushion frame bracket.
    1. Disconnect the ECU electrical connector.
    2. Remove the rivets.
    3. Remove the ECU.
    Fig 7: Removing Electronic Control Unit From Seat Cushion Frame Bracket
    G03959702Courtesy of FORD MOTOR CO.

    11. Vehicles with a service kit occupant classification sensor (OCS) 

    CAUTION: Use care when separating the seat upholstery from the hook-and-loop strip, or the hook-and-loop strip can be torn from the seat cushion foam pad.
    Fig 8: Removing Seat Cushion Trim Cover From Foam Pad
    G03959698Courtesy of FORD MOTOR CO.
  11. If installing a new OCS or trim cover, release the hook-and-loop strips and remove the seat cushion trim cover from the foam pad.
  12. Separate the occupant classification sensor (OCS) components from the seat cushion frame.
    1. Cut the tie straps.
    2. Remove the rivets and separate the electronic control unit (ECU) from the seat cushion frame bracket.
    3. Bend and release the retaining tabs holding the pressure sensor in place.
    4. Slide the pressure sensor off the bracket.
    5. Disconnect the electrical connector.
    Fig 9: Removing Occupant Classification Sensor Components From Seat Cushion Frame
    G03959704Courtesy of FORD MOTOR CO.
  13. Remove the OCS from the seat cushion frame.
Fig 10: Removing OCS From Seat Cushion Frame
G03959705Courtesy of FORD MOTOR CO.
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