Seat Occupant Sensor: Service and Repair
OCCUPANT CLASSIFICATION SENSORPart 1:
Part 2:
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.
- 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.
- 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.
- 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.
CAUTION: 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 restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
- The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
- Repair is made by installing a new part only. If the new part does not correct the condition, install the original part and perform the diagnostic procedure again.
- Outboard shown, inboard similar.
1. Remove the passenger seat.
2. CAUTION: 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 position and the routing of the OCS rail electrical wiring, connector and wiring retainers for installation.
On the affected side, detach the 2 OCS rail wiring retainers. Then, 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 most position.
- If equipped with a power seat track, apply power and ground to the pins shown.
5. Remove the 2 rear bolts from the affected OCS rail.
6. Move the seat to the rearward most position.
- If equipped with a power seat track, apply power and ground to the pins shown.
7. NOTE: Note the position of where the locator tab on the OCS rail goes through the OCS rail shield and into the rear mounting point of the seat track for installation.
Remove the 2 front bolts and the affected OCS rail and shield.
Installation
NOTE:
- If installing a new seat track, position the seat track where the seat will be in the rearward most position before starting installation of the OCS rails.
- 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.
CAUTION: Prevent oil and/or grease from getting on the 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. Align the locator tab to the shield.
Position the OCS rail shield on the OCS rail. Then position the OCS rail and shield on the seat track while noting the correct installation of the OCS rail locator tab into the seat track.
2. While holding the OCS rail and shield firmly in position, install the OCS rail front mounting position rear bolt.
- Tighten to 25 Nm (18 lb-ft).
3. While still holding the OCS rail and shield firmly in position, install the OCS rail front mounting position front bolt.
- Tighten to 25 Nm (18 lb-ft).
4. Move the seat to the forward most 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. Then route the OCS rail 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.
10. Carry out the appropriate procedure after installation of an OCS system component.
- If installing the original OCS system, carry out the Occupant Classification Sensor (OCS) System Zero Seat Weight Test and prove out the SRS. Occupant Classification Sensor (OCS) System Zero Seat Weight Test
- If installing a new OCS system, carry out the Occupant Classification Sensor (OCS) System Reset procedure and prove out the SRS. Programming and Relearning