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Occupant Classification Sensor: Removal

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: To reduce the risk of personal injury, do not use any memory saver devices.
WARNING: Do not separate components.
CAUTION: It is necessary to rezero the occupant classification sensor (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 supplemental restraint system (SRS) component is being serviced, the SRS must be depowered.
NOTE: The 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 air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a SRS fault.
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 perform the diagnostic procedure again.

All seats 

  1. Remove the passenger seat and depower the system. For additional information, refer to SEATING article.
  2. Remove the seat backrest. For additional information, refer to SEATING article.
  3. Remove the power seat track or manual seat track. For additional information, refer to SEATING article.
    4. CAUTION: While positioning the seat cushion pan and OCS assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
  4. Release the trim cover J-clips.
    5. Fig 1: Releasing Trim Cover J-Clips
    GF0019526Courtesy of FORD MOTOR CO.

    Seats with a production OCS 

  5. Remove the seat cushion pan and OEM OCS from the foam pad and trim cover.
    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.
  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. Fig 2: Identifying Seat Cushion Trim Cover
    GF0019527Courtesy of FORD MOTOR CO.
  7. Remove the OCS bladder pin-type retainers.
  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.
    9. Fig 3: Identifying Pressure Sensor Off Bracket And Electrical Connector
    GF0019528Courtesy of FORD MOTOR CO.
    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.
  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. Fig 4: Locating Pressure Sensor And Hose
    GF0019529Courtesy of FORD MOTOR CO.
  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.
    11. Fig 5: Identifying ECU, Rivets And ECU Electrical Connector
    GF0019530Courtesy of FORD MOTOR CO.

    Seats with a service kit 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.
  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. Fig 6: Locating Seat Cushion Trim Cover
    GF0019527Courtesy of FORD MOTOR CO.
  12. Separate the OCS components from the seat cushion frame.
    1. Cut the tie straps.
    2. Remove the rivets and separate the 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.
    13. Fig 7: Identifying Pressure Sensor Off Bracket And Electrical Connector
    GF0019531Courtesy of FORD MOTOR CO.
  13. Remove the OCS from the seat cushion frame.
    • Feed the hose, pressure sensor, wire harness, electrical connector and ECU through the seat cushion frame support assembly.
    14. Fig 8: Locating Occupant Classification Sensor Assembly On Seat Cushion Frame
    GF0019532Courtesy of FORD MOTOR CO.
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