Front Seat Cushion - OCS

FRONT SEAT CUSHION - OCS

REMOVAL

A non-calibrated Occupant Classification Module (OCM) is the only component of the Occupant Classification System (OCS) that is available for separate service replacement, as outlined in the procedures that follow. The OCS components of the passenger side front seat cushion including the occupant detection bladder, pressure sensor, seat cushion foam, wiring harness and the OCM are a factory-calibrated and assembled unit. Once this unit is connected to a vehicle electrically, the calibration settings are uploaded from the OCM and stored in the memory of the Occupant Restraint Controller (ORC). If only the OCM is subsequently replaced, the new, non-calibrated OCM learns the proper calibration settings from the ORC after it is connected to the vehicle electrically.

If any of the remaining OCS components of the passenger side front seat cushion require replacement, they are serviced only as a factory-calibrated, assembled, and tamper-evident service replacement package. This package includes the bladder, sensor, foam, wiring and a calibrated OCM. Do not attempt to separate or disconnect any of the new OCS components contained in the service replacement package from each other, and do not attempt to reuse any of the replaced components in this or any other vehicle. When installing this package, always replace all of the existing components with the new components as a unit.

Once any of the original factory-installed components have been replaced with the service replacement package components, the OCM can only be serviced by replacing the entire passenger side front seat cushion unit with another complete service replacement package.

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment

WARNING: To avoid personal injury or death on vehicles equipped with the occupant classification system (OCS), only the occupant classification module (OCM) and seat cover on leather seats can be serviced separately. All other components of the passenger side front seat cushion OCS kit assembly must be serviced only as a complete factory-calibrated, assembled and tamper-evident service replacement package. This package includes the bladder, sensor, foam, wiring and a calibrated (OCM). When installing this package always replace all of the existing components with the new components as a unit. Do not attempt to separate or disconnect any of the new OCS components in the service replacement package from each other, and do not attempt to reuse any of the replaced components in this or any other vehicle. Failure to take the proper precautions could result in failure of the passenger airbag to deploy when required, or in passenger airbag deployment when not required.

1. Remove seat from vehicle.
2. Hook up scan tool and perform circuit test.
3. Open hood.
4. Disconnect negative battery.
5. Open passenger door.
6. Remove seat cushion side covers.
7. Leave shield switch harness attached-Let hang.
8. Remove cushion seat inner shield.
9. Remove seat track front and rear covers if equipped.
10. If equipped, open storage bin to access front pan bolts.
11. Remove bolts (4) attaching seat cushion pan to seat track.
12. Disconnect wire connectors, if equipped.
13. Remove seat cushion from seat.
14. Disengage J-strap retainers holding seat cover to cushion.

Fig. 32:

15. Remove cover and pad from seat cushion pan. (Fig. 32)

INSTALLATION

A non-calibrated Occupant Classification Module (OCM) is the only component of the Occupant Classification System (OCS) that is available for separate service replacement, as outlined in the procedures that follow. The OCS components of the passenger side front seat cushion including the occupant detection bladder, pressure sensor, seat cushion foam and the OCM are a factory-calibrated and assembled unit. Once this unit is connected to a vehicle electrically, the calibration settings are uploaded from the OCM and stored in the memory of the Occupant Restraint Controller (ORC). If only the OCM is subsequently replaced, the new, non-calibrated OCM learns the proper calibration settings from the ORC after it is connected to the vehicle electrically.

If any of the remaining OCS components of the passenger side front seat cushion require replacement, they are serviced only as a factory-calibrated, assembled, and tamper-evident service replacement package. This package includes the bladder, sensor, foam, wiring and a calibrated OCM. When installing this package, always replace all of the existing components with the new components as a unit. Do not attempt to separate or disconnect any of the new OCS components contained in the service replacement package from each other, and do not attempt to reuse any of the replaced components in this or any other vehicle.

Once the OCS service kit has been installed, the OCM can only be serviced by replacing the entire OCS service kit with another complete service replacement package.

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

WARNING: To avoid personal injury or death on vehicles equipped with the occupant classification system (OCS), only the occupant classification module (OCM) and the seat cushion trim may be serviced separately. All other components of the passenger side front seat cushion assembly must be serviced only as a complete factory-calibrated, assembled and tamper-evident service replacement package. This package includes the bladder, sensor, foam, wiring and a calibrated OCM. When installing this package always replace all of the existing components with the new components as a unit. Do not attempt to separate or disconnect any of the new OCS components in the service replacement package from each other, and do not attempt to reuse any of the replaced components in this or any other vehicle. Failure to take the proper precautions could result in failure of the passenger airbag to deploy when required, or in passenger airbag deployment when not required.

NOTE: After replacing passenger front seat cushion and/or Occupant Classification Module (OCM) there may be a wire connector not used from the Seat Weight Sensor. Secure wire connector to the seat cushion frame with wire ties.

Fig. 33:

1. Place service replacement package on top of the seat cushion pan and route the bladder hose, wiring and OCM through seat center hole in seat pan. (Fig. 33)

Fig. 34:

2. Install bladder into the seat cushion pan with push pins. (Fig. 34)

Fig. 35:

3. Install OCM to the OCS module attaching bracket with two screws. (Fig. 35)
4. Clip wiring harness to cushion pan.
5. Clip service replacement package connector to OCS module attaching bracket.
6. Attach seat wiring connector to the service replacement package connector.

Fig. 36:

7. Tie strap to the unused seat wiring connector. (Fig. 36)
8. Install bolts attaching seat cushion and OCS module attaching bracket to the seat track. Tighten seat bolts to 28.5 N.m (21 ft.lbs.).
9. Velcro old seat cushion cover onto new foam.
10. Engage J-strap retainers to hold seat cushion cover to cushion.
11. Install seat track front and rear covers, if equipped.
12. Install seat cushion outer side covers.
13. Do not reconnect the battery negative cable at this time. The supplemental restraint system verification test procedure should be performed following service of any supplemental restraint system component. Refer to Computers and Control Systems / Testing and Inspection.
14. Following successful completion of the supplemental restraint system verification test procedure, perform the Occupant Classification System Verification Test using a diagnostic scan tool and the Occupant Classification Seat Weight special tool. Refer to Restraint Systems.