Seat Occupant Sensor
SPECIAL TOOL(S)
REMOVAL
NOTE:
- The seat occupant sensor is found only on the front passenger seat and was not equipped on all vehicles. A white tag having the letters "OCS" (occupant classification sensor) will appear under the front of the passenger seat identifying a seat equipped with a seat occupant sensor.
- Occupant classification sensor components (seat cushion foam pad, bladder with pressure sensor and electronic control unit) are calibrated to each other. Occupant classification sensor components are not to be installed separately. If a new occupant classification sensor or seat cushion foam pad are needed, a service part must be used as an assembly.
- An original equipment occupant classification sensor will have electrical connectors that can be disconnected at the electronic control unit and the pressure sensor and a seat cushion foam pad that is not attached to the bladder and pressure sensor assembly. A service part occupant classification sensor will have electrical disconnect deterrents at the electronic control unit and pressure sensor.
1. Prepare the vehicle for occupant classification sensor removal.
1 Disconnect the battery ground cable and wait at least one minute.
WARNING:
- TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY, THE BACKUP POWER SUPPLY MUST BE DEPLETED BEFORE REPAIRING OR REPLACING ANY FRONT OR SIDE AIR BAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS) COMPONENTS AND BEFORE SERVICING, REPLACING, ADJUSTING OR STRIKING COMPONENTS NEAR THE FRONT OR SIDE AIR BAG SENSORS, SUCH AS DOORS, INSTRUMENT PANEL, CONSOLE, DOOR LATCHES, STRIKERS, SEATS AND HOOD LATCHES.
- THE SIDE AIR BAG SENSORS ARE LOCATED AT OR NEAR THE BASE OF THE B-PILLAR.
- TO DEPLETE THE BACKUP POWER SUPPLY ENERGY, DISCONNECT THE BATTERY GROUND CABLE AND WAIT AT LEAST ONE MINUTE. BE SURE TO DISCONNECT AUXILIARY BATTERIES AND POWER SUPPLIES (IF EQUIPPED).
2 Deactivate the supplemental restraint system (SRS).
WARNING: TO REDUCE THE RISK OF SERIOUS PERSONAL INJURY, READ AND FOLLOW ALL WARNINGS, NOTES, AND INSTRUCTIONS IN THE SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEACTIVATION/REACTIVATION PROCEDURE.
3 Remove the front seat.
WARNING: TO REDUCE THE RISK OF SERIOUS PERSONAL INJURY, READ AND FOLLOW ALL WARNINGS, CAUTIONS, NOTES, AND INSTRUCTIONS IN THE SEAT REMOVAL AND INSTALLATION PROCEDURE.
2. Remove the front seat backrest.
3. Remove the seat track.
4. Remove the pin-type retainer and separate the remaining seat cushion trim cover J-clips from the seat cushion frame.
5. Separate the hook and loop strips. Position the seat cushion trim cover out of the way.
CAUTION:
- If replacing only the front passenger seat cushion trim cover, the seat occupant sensor must be rezeroed.
- 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.
- 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.
Vehicles With An Original Equipment Occupant Classification Sensor
6. Remove the seat cushion pad from the seat cushion frame.
7. Remove the pin-type retainers holding the occupant classification sensor bladder to the seat cushion frame.
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.
8. Remove the electronic control unit and pressure sensor from the seat cushion frame bracket.
1 Disconnect the electronic control unit and pressure sensor electrical connectors.
2 Using a 5 mm (7/32-inch) drill bit, drill out the rivets and separate the electronic control unit from the seat cushion frame.
3 Bend and release the retaining tab (not shown) holding the pressure sensor in place.
4 Slide the pressure sensor off the bracket.
NOTE: For installation, note the holes in the seat cushion frame being used to retain the electronic control unit.
9. Separate the occupant classification sensor bladder and pressure sensor from the seat cushion frame.
- Feed the pressure sensor and hose through the seat cushion support assembly.
Vehicles With A Service Part Occupant Classification Sensor
10. Separate the occupant classification sensor components from the seat cushion frame.
1 Cut the tie straps.
2 Using a 5 mm (7/32-inch) drill bit, drill out the rivets and separate the electronic control unit from the seat cushion frame.
3 Bend and release the retaining tabs holding the pressure sensor in place.
4 Slide the pressure sensor off the bracket.
NOTE: For installation, note the holes in the seat cushion frame being used to retain the electronic control unit.
11. Remove the occupant classification sensor from the seat cushion frame.
- Feed the hose, pressure sensor, wire harness, electrical connector and electronic control unit through the seat cushion frame support assembly.
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.
INSTALLATION
WARNING: TO REDUCE THE RISK OF SERIOUS PERSONAL INJURY, READ AND FOLLOW ALL WARNINGS, CAUTIONS, AND NOTES AT THE BEGINNING OF THE REMOVAL PROCEDURE.
All Seats
1. Bend the retaining ear back on the occupant sensor component bracket.
Vehicles Having The Original Equipment Occupant classification sensor installed
2. Position the occupant classification sensor assembly to the seat cushion frame.
- Feed the pressure sensor with hose through the largest opening at the front of the seat cushion frame support assembly.
CAUTION:
- Failure to route the seat occupant sensor components through the correct seat cushion support opening can cause component failure.
- 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.
- Inspect the occupant classification sensor assembly, seat cushion frame and support assembly for any foreign objects before installing the occupant classification sensor assembly to the seat cushion frame. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
3. Install the pin-type retainers holding the occupant sensor bladder to the seat cushion frame.
CAUTION: Inspect the occupant classification sensor bladder, seat cushion frame and support assembly for any foreign objects, before installing the occupant classification sensor to the seat cushion frame. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
4. Attach and connect the occupant classification sensor components.
1 Using the holes noted during removal, position the electronic control unit onto the seat cushion frame and install new rivets.
2 Install the pressure sensor onto the seat cushion frame bracket, making sure the retaining ear is completely engaged.
3 Connect the electronic control unit.
4 Connect the pressure sensor.
5. Install the seat cushion pad to the seat cushion frame.
CAUTION: Inspect the seat cushion pad and frame for any foreign objects before installing the seat cushion frame to the seat cushion pad. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
Vehicles having a service part occupant classification sensor installed
6. Position the occupant classification sensor assembly to the seat cushion frame.
- Using a service occupant classification sensor, feed the electronic control unit, electrical connector, wire harness, pressure sensor, and hose through the largest opening at the front of the seat cushion frame support assembly.
- Position the seat cushion pad and bladder to the seat cushion frame.
CAUTION:
- Failure to route the seat occupant sensor components through the correct seat cushion support opening can cause component failure.
- Inspect the occupant classification sensor assembly, seat cushion frame and support assembly for any foreign objects, before installing the occupant classification sensor assembly to the seat cushion frame. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
7. Attach and connect the occupant classification sensor components.
1 Using the holes noted during removal, position the electronic control unit onto the seat cushion frame and install new rivets.
2 Install the pressure sensor onto the seat cushion frame bracket, making sure the retaining ear is completely engaged.
3 Connect the main seat wire harness occupant classification sensor electrical connector to the service part occupant classification sensor electrical connector.
4 Tie strap all loose wire harnesses and electrical connectors safely out of the way.
NOTE: When installing a service part occupant classification sensor, the main seat wire harness pressure sensor electrical connector does not get used.
All Vehicles
8. Align the seat cushion trim cover to the seat cushion pad and fasten the hook and loop strips.
CAUTION:
- If replacing only the front passenger seat cushion trim cover, the seat occupant sensor must be rezeroed.
- Inspect the seat cushion pad and seat cushion trim cover for any foreign objects, before installing the seat trim cover to the seat cushion pad. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
- 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.
9. With the seat cushion frame bottom side up, attach the seat cushion trim cover J-clips and pin-type retainer to the seat cushion frame.
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.
10. Install the seat track.
11. Install the front seat backrest.
12. Restore the vehicle to operating condition.
1 Install the front seat.
WARNING: TO REDUCE THE RISK OF SERIOUS PERSONAL INJURY, READ AND FOLLOW ALL WARNINGS, CAUTIONS, NOTES, AND INSTRUCTIONS IN THE SEAT REMOVAL AND INSTALLATION PROCEDURE.
2 Reactivate the supplemental restraint system (SRS).
WARNING: TO REDUCE THE RISK OF SERIOUS PERSONAL INJURY, READ AND FOLLOW ALL WARNINGS, NOTES, AND INSTRUCTIONS IN THE SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEACTIVATION/REACTIVATION PROCEDURE.
3 With all the restraint system diagnostic tools removed, prove out the supplemental restraint system (SRS).
WARNING: THE RESTRAINT SYSTEM DIAGNOSTIC TOOL IS FOR RESTRAINT SYSTEM SERVICE ONLY. REMOVE FROM THE VEHICLE PRIOR TO ROAD USE. FAILURE TO REMOVE COULD RESULT IN INJURY AND POSSIBLE VIOLATION OF VEHICLE SAFETY STANDARDS.
13. Zero the occupant classification sensor.
1 With the front passenger seat empty, use a scan tool to trigger the active command and zero the occupant classification sensor. If a scan tool is not available, use the alternative method listed below, to zero the occupant classification sensor.
2 Using a scan tool is the preferred method of zeroing an occupant classification sensor. If a scan tool is not available, rezeroing will occur during normal driving conditions.
14. Prove out the supplemental restraint system (SRS).
15. Check the active restraint system for correct operation.
16. Fill out the necessary information on the occupant classification sensor traceability card and return it along with the complete inoperative occupant classification sensor to Ford Motor Company.
- When returning the inoperative occupant classification sensor include: seat cushion foam pad, bladder, electronic control unit, pressure sensor (transducer), hose, electrical connectors and wire harness (service part occupant classification sensor only).
NOTE: When installing a new occupant classification sensor, a prepaid return postcard is provided with the new occupant classification sensor. The serial number for the new part and the Vehicle Identification Number (VIN) must be recorded and sent to Ford Motor Company.