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Occupant Classification Sensor: Removal

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Install a new occupant classification sensor (OCS) system service kit as a complete assembly. Never install only part of the kit components. Failure to follow this instruction may result in incorrect operation of the OCS system and increases the risk of serious personal injury or death in a crash.
WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
NOTE: While positioning the seat cushion frame and Occupant Classification Sensor (OCS) assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
NOTE: Occupant Classification Sensor (OCS) system components (seat cushion foam pad, bladder with pressure sensor and Occupant Classification System Module (OCSM) are calibrated to each other and are serviced as an assembly. The OCS system components are not to be installed separately.
NOTE: To identify between a production OCS system and a OCS system service kit, inspect the OCSM electrical connector.  A production OCS system allows the disconnect of the OCSM electrical connector. An OCS system service kit has the OCSM electrical connector glued to the module. It cannot and should not be disconnected or altered.
NOTE: The heated seat element on the front passenger seat cushion is not serviceable separately. If a new heated seat element is needed on the front passenger seat cushion, a new OCS system service kit and a new heated seat element must be installed.
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

All seats 

  1. Remove the front passenger seat. For additional information, refer to SEATING article.
  2. Remove the front seat backrest. For additional information, refer to SEATING article.
  3. Remove the seat track. For additional information, refer to SEATING article.

    4. Heated seats 

  4. Disconnect the cushion heated seat element electrical connector.

    5. Seats with manual recline 

  5. Remove the seat backrest recliner handle.

    6. Seats with power lumbar 

  6. Release the tabs at the front and back to separate the power lumbar switch and bezel from the seat cushion pan.
  7. Disconnect the electrical connector and remove the power lumbar switch.

    8. All seats 

  8. Release the remaining seat cushion trim cover J-clips.
    9. NOTE: It is necessary to carry out the Occupant Classification Sensor (OCS) system reset when a front passenger seat cushion is disassembled, a new trim cover installed or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out the OCS system reset. Failure to follow these instructions may result in incorrect operation of the OCS system and may cause system failure.
    NOTE: Use care when separating the seat cushion trim cover from the hook-and-loop strip. The hook-and-loop strip can be torn from the seat cushion foam. Failure to follow this procedure can result in component damage and/or system failure.
  9. Separate the hook-and-loop strips. Position the seat cushion trim cover aside.
    10. Fig 1: Identifying Hook And Loop Strips
    GF0013476Courtesy of FORD MOTOR CO.
  10. Bend the retaining tab holding the pressure sensor in place down and aside.
    11. Fig 2: Identifying Pressure Sensor
    GF0013477Courtesy of FORD MOTOR CO.

    Seats with an original equipment OCS 

  11. Remove the seat cushion pad from the seat cushion frame.
  12. If necessary, remove the 2 pin-type retainers and the mat, otherwise position the mat aside.
  13. Remove the OCSM and separate the pressure sensor from the OCSM bracket.
    1. Release the pressure sensor hose.
    2. Disconnect the electrical connector and slide the pressure sensor off the bracket.
      3. NOTE: Do not oversize the seat cushion frame holes used to rivet the Occupant Classification System Module (OCSM) in place. Failure to follow these instructions may result in incorrect operation of the Occupant Classification Sensor (OCS) system and may cause system failure.
    3. Using a 5 mm (3/16 in) drill, remove the 3 rivets.
    4. Remove the OCSM bracket.
    5. Disconnect and remove the OCSM.
    14. Fig 3: Removing ECU
    GF0013478Courtesy of FORD MOTOR CO.
  14. Remove the pin-type retainers holding the occupant classification sensor bladder to the seat cushion pan.
    15. 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.
  15. Separate the OCS bladder and pressure sensor from the seat cushion frame.
    • Feed the pressure sensor and hose through the seat cushion support assembly.
    16. Fig 4: Identifying Pressure Sensor And Hose
    GF0013479Courtesy of FORD MOTOR CO.

    Seats with an OCS system service kit 

  16. Separate the OCS system components from the seat cushion frame.
    1. Release the pressure sensor hose.
    2. Slide the pressure sensor off the bracket.
    3. Cut the tie straps.
      4. NOTE: Do not oversize the seat cushion frame holes used to rivet the Occupant Classification System Module (OCSM) in place. Failure to follow these instructions may result in incorrect operation of the Occupant Classification Sensor (OCS) system and may cause system failure.
    4. Using a 5 mm (3/16 in) drill, remove the 3 rivets.
    5. Remove the ECU bracket.
    6. Disconnect the service part OCS electrical connector.
    17. Fig 5: Identifying OCS Components
    GF0013480Courtesy of FORD MOTOR CO.
    NOTE: Make note of the opening that the OCS system components are being fed through on the seat cushion support assembly for installation purposes.
  17. Remove the OCS system from the seat cushion frame.
    • Feed the hose, pressure sensor, wire harness, electrical connector and OCSM through the seat cushion frame support assembly.
    18. Fig 6: Identifying Hose, Pressure Sensor, Wire Harness, Electrical Connector And ECU
    GF0013481Courtesy of FORD MOTOR CO.
  18. If necessary, remove the 2 pin-type retainers and the mat.
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