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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 931 (Supplemental Inflatable Restraint System) >> Removal And Installation >> Occupant Classification Sensor - Original Equipment >> Removal

Occupant Classification Sensor - Original Equipment: Removal

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. 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: To reduce the risk of personal injury, do not use any memory saver devices.
WARNING: Do not separate the occupant classification sensor (OCS) system components.
CAUTION: There are 4 occupant classification sensor (OCS) system service kits available for this vehicle. Two are for early build vehicles (base seat and heated seat) and 2 are for late build vehicles (base seat and heated seat). The OCS service kits are not interchangeable. Always refer to the vehicle build date and vehicle options to make sure the correct OCS service kit is installed.
CAUTION: It is necessary to carry out the 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.
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 service kit equipped with a heated seat element must be installed.
NOTE: OCS system components, seat cushion foam pad, bladder with pressure sensor and electronic control unit (ECU), 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 ECU) 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: If removing an OCS service kit, refer to the appropriate procedure.
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 carry out the diagnostic procedure again.
  1. Depower the system. For additional information, refer to Supplemental Restraint System (SRS) Depowering and Repowering .
  2. Remove the passenger seat. For additional information, refer to SEATING article.
  3. Disconnect the electrical connectors and wiring clips.
    1. Disconnect the occupant classification sensor (OCS) electronic control unit (ECU) electrical connector.
    2. Disconnect the pressure sensor electrical connector.
    3. Release the 2 wiring clips on the wiring harness from the cushion pan.
    4. If equipped with heated seats, disconnect the heated seat module electrical connector, release the wiring clip on the wiring harness from the cushion pan, and disconnect the 2 cushion element electrical connectors.
    4. Fig 1: Electrical Connectors & Wiring Clips
    GF0024003Courtesy of FORD MOTOR CO.
  4. Remove the 4 seat cushion bolts retaining the seat cushion to the seat track.
    5. CAUTION: While positioning the seat cushion pan and occupant classification sensor assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
  5. Remove the seat cushion and pan assembly.
    • To aid in removal, recline the seat.
    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. Detach the seat cushion trim cover J-clips from the seat cushion pan and remove the seat cushion trim cover.
    7. Fig 2: Seat Cushion Trim Cover J-Clips
    GF0024004Courtesy of FORD MOTOR CO.
  7. Remove the seat cushion foam pad.
  8. Bend the retaining tab away from the pressure sensor, then slide the pressure sensor off the bracket.
    9. Fig 3: Pressure Sensor Retaining Tab
    GF0024005Courtesy of FORD MOTOR CO.
    CAUTION: Care must be taken to prevent damage to the set cushion pan when removing the rivets.
  9. Remove the 2 rivets and the OCS ECU.
  10. Remove the 2 pin-type retainers from the OCS bladder and seat cushion pan.
  11. Feed the OCS hose and pressure sensor through the seat cushion pan opening and remove as an assembly with the bladder.
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