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Seat Occupant Sensor: Service and Repair




Occupant Classification Sensor

NOTE: Outboard Occupant Classification Sensor (OCS) rail shown, inboard similar.











Removal

WARNING: The occupant classification sensor (OCS) rails have a built-in strain gauge which may operate incorrectly if an OCS rail is dropped by itself, dropped after it is installed to the front passenger seat or dropped after it is installed to a front passenger seat track assembly. Use care when handling an OCS rail before or after it is installed to the front passenger seat or seat track assembly. Failure to follow these instructions may result in incorrect operation of the OCS system and increases the risk of serious personal injury or death in a crash.

WARNING: Do not disassemble the occupant classification sensor (OCS) rail or tighten or loosen any of the nuts and bolts installed to the OCS rail body. Only the 8 bolts that attach the 2 OCS rails to the seat track may be removed and installed. Failure to follow these instructions may result in incorrect operation of the OCS system and increase the risk of serious personal injury or death in a crash.

WARNING: Never allow oil, grease, water or foreign contaminants to get on/in the occupant classification sensor (OCS) components or electrical connectors. 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: Use care when handling the front passenger seat and track assembly. Dropping the assembly, placing excessive weight on or sitting on a front passenger seat that is not secured in the vehicle may result in damaged seat components. Failure to follow these instructions may result in incorrect operation of the occupant classification sensor (OCS) system and increases the risk of serious personal injury or death in a crash.

NOTICE: Prevent oil and/or grease from getting on the Occupant Classification Sensor (OCS) rail bolts as this can lead to tightening beyond the specified torque value. Failure to follow this instruction may result in damaged or broken OCS rail bolts.

NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

1. Remove the front passenger seat. For additional information, refer to Seats.

2. NOTICE: Before releasing the Occupant Classification Sensor (OCS) rail electrical connector, push only on the tip of the connector release tab to release the electrical connector. Do not insert the tool too deep into the OCS rail electrical connector or damage to the electrical connector may occur.

NOTE: Note the Occupant Classification Sensor (OCS) rail position, electrical wiring routing, wiring, connector and wiring retainers for installation.

On the affected side, detach the 2 OCS rail wiring retainers and using a suitable tool, release the tab and disconnect the OCS rail electrical connector.





3. If equipped, disconnect the power seat track motor electrical connector.





4. Move the seat to the forward stop position.
- If equipped with a power seat track, apply power and ground to the pins shown.





5. Remove the 2 rear bolts from the OCS rail.

6. Move the seat to the rearward stop position.
- If equipped with a power seat track, apply power and ground to the pins shown.





7. NOTE: Note the locator tab position where the OCS rail goes through the rail shield and into the rear seat track mounting point for installation.

Remove the 2 front bolts and OCS rail and shield.

Installation

NOTE: If installing a new seat track, position the seat track where the seat will be in the full rearward position before installing the OCS rails.

NOTE: To make sure of correct installation, the OCS rail bolts must be installed in the sequence shown.

1. WARNING: To prevent foreign material and contaminants from entering the occupant classification sensor (OCS) rail, make sure the OCS rail shield is present, is not damaged and is correctly installed to the OCS rail. Failure to follow these instructions may result in incorrect operation of the OCS system and increases the risk of serious personal injury or death in a crash.

NOTICE: Prevent oil and/or grease from getting on the Occupant Classification Sensor (OCS) rail bolts as this can lead to tightening beyond the specified torque value. Failure to follow this instruction may result in damaged or broken OCS rail bolts.

NOTE: Make sure the OCS rail shield is seated correctly on the OCS rail.

Install the shield on the OCS rail, and install the OCS rail and shield on the seat track with the locator tab aligned correctly as shown.





2. Hold the OCS rail and shield firmly in position and install the front mounting position rear bolt.
- Tighten to 25 Nm (18 lb-ft).





3. Hold the OCS rail and shield firmly in position and install the front mounting position front bolt.
- Tighten to 25 Nm (18 lb-ft).





4. Move the seat to the forward stop position.
- If equipped with a power seat track, apply power and ground to the pins shown.





5. Install the 2 rear OCS rail bolts.
- Tighten to 25 Nm (18 lb-ft).

6. NOTE: Make sure to route the OCS rail wiring and install the 2 wiring retainers as noted during removal.

Connect the OCS rail electrical connector, route the wiring and attach the 2 wiring retainers.

7. Center the seat track to the seat cushion frame.
- If equipped with a power seat track, apply power and ground to the pins shown.





8. If equipped, connect the power seat track motor electrical connector.

9. Install the passenger seat. Do not prove out the SRS at this time. For additional information, refer to Seats.

10. Carry out the appropriate procedure after installation of an OCS system component.
- If installing the original OCS system component, carry out the Occupant Classification Sensor (OCS) System Zero Seat Weight Test and prove out the SRS. For additional information, refer to Occupant Classification Sensor (OCS) System Zero Seat Weight Test Component Tests and General Diagnostics.

- If installing a new OCS system component, carry out the Occupant Classification Sensor (OCS) System Reset procedure and prove out the SRS. For additional information, refer to Occupant Classification Sensor (OCS) System Reset Programming and Relearning.

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