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Seat Occupant Sensor: Service and Repair




Occupant Classification Sensor





Original Equipment Manufacturer (OEM) Occupant Classification System (OCS) System









Service Kit Occupant Classification System (OCS) System









Removal

WARNING: Make sure the front passenger seat repair is complete, the seat and all attached components (head restraint, seat side shield, etc.) are correctly assembled, and the seat is correctly installed to the vehicle before carrying out the System Reset. Failure to follow these instructions may result in incorrect operation of the occupant classification system (OCS) and increases the risk of serious personal injury or death in a crash.

NOTICE: Carry out the Occupant Classification System (OCS) system reset when a front passenger seat cushion is disassembled, a new trim cover is installed or an OCS system service kit is installed. Use a scan tool to carry out the OCS system reset. Failure to follow this instruction may result in system failure and incorrect operation of the OCS system.

NOTE: Occupant Classification System (OCS) system components, seat cushion foam pad, bladder with pressure sensor and Occupant Classification System Module (OCSM), are calibrated to each other and are serviced as an assembly. If a new OCS system or OCS system component is needed, install a new OCS system service kit.

NOTE: To identify between a production OCS system and a OCS system service kit, inspect the OCSM and pressure sensor electrical connectors. An OCS system service kit has the electrical connectors glued and should not be disconnected or altered.

NOTE: The heater mat is not serviced separately. If a new heater mat is needed on the front passenger seat cushion, install a new OCS system service kit with a heater mat.

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 Seating Seat - Front.

2. Remove the recliner handle bolt cover, the bolt and the recliner handle.





3. Remove the cushion side shield.

1. Remove the screw at the rear of the cushion side shield.

2. Pull out at the back of the cushion side shield to release the locator pins and tab.

3. Slide the cushion side shield forward to disengage the brackets Remove the cushion side shield.





4. Remove the screw and the inner recliner cover.

5. Detach the J-clip retainers.





6. Disengage the remaining cushion cover retainers attached to the seat track and seat cushion frame.
- If Original Equipment Manufacturer (OEM) Occupant Classification System (OCS), remove the cushion foam pad and cover.

7. Remove the Occupant Classification System Module (OCSM).

1. For OEM OCS, disconnect the electrical connector, if equipped.

2. Remove the 2 screws.

3. Release the tab and remove the OCSM.





8. Disengage the 2 retainers and slide the pressure sensor off the bracket.





9. NOTE: Note the wire routing for installation.

Disconnect all the seat cushion wire harness electrical connectors and detach the retainers.

10. For OEM OCS, lift the foam pad and remove the Occupant Classification System (OCS) bladder pin-type retainers.

11. Route the OCS components out from between the cushion supports.
- At installation, make sure the hose is not kinked.





12. Remove the hog rings and the cushion cover.

13. To install, reverse the removal procedure.

14. Repower the SRS. Do not prove out the SRS at this time. For additional information, refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures information.

15. WARNING: Occupant classification system(OCS) parts are calibrated as an assembly and must only be replaced in the configuration they are sold. Never separate parts of an assembly. Failure to follow this instruction may result in incorrect operation of the OCS and increases the risk of serious personal injury or death in a crash.

NOTICE: To prevent system failure, take the following precautions before carrying out the Occupant Classification System (OCS) system reset:
- Make sure the voltage to the Occupant Classification System Module (OCSM) is greater than 8 volts and less than 18 volts.
- Make sure the OCS system is not at a temperature below 6°C (42°F) or above 36°C (97°F) when initiating the OCS system reset process. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed and kept at a temperature between 6°C to 36°C (42°F to 97°F) for a minimum of 30 minutes.
- Make sure nothing is present on the passenger seat before and during the OCS system reset process.
- Prior to carrying out the OCS system reset, make sure a minimum of 8 seconds has elapsed after cycling the ignition switch ON.


Carry out the OCS system reset.

16. If the first system reset attempt was unsuccessful, carry out a thorough visual inspection of the following and repair any concerns found.
- OCS system connector and wiring for damage

- Pressure sensor hose for kinks and/or damage

- Seat-related wiring harness and body wiring harness terminals and connectors for damage

17. NOTE: Cycle the ignition switch after the OCS system reset.

Carry out a second OCS system reset. If the second attempt is unsuccessful, install a new OCS system service kit. For additional information, refer to Occupant Classification System in Supplemental Restraint System.

18. Prove out the SRS as follows:

Turn the ignition switch from ON to OFF. Wait 10 seconds, then turn the ignition switch back to ON and visually monitor the air bag warning indicator with the air bag modules installed. The air bag warning indicator will illuminate continuously for approximately 6 seconds and then turn off. If an air bag SRS fault is present, the air bag warning indicator will:
- fail to light.
- remain lit continuously.
- flash at a 5 Hz rate (RCM not configured).

The air bag warning indicator may not illuminate until approximately 30 seconds after the ignition switch has been turned from the OFF to the ON position. This is the time required for the RCM to complete the testing of the SRS. If the air bag warning indicator is inoperative and a SRS fault exists, a chime sounds in a pattern of 5 sets of 5 beeps. If this occurs, diagnose and repair the air bag warning indicator and any SRS fault discovered.

Use a scan tool and clear all continuous DTCs from the RCM and Occupant Classification System Module (OCSM).

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