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Seat Occupant Sensor: Service and Repair

OCCUPANT CLASSIFICATION SENSOR

Special Tool(s)


Special Tool(s):











Removal and Installation

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 sensor (OCS) system and increases the risk of serious personal injury or death in a crash.

CAUTION:
- It is necessary to carry out the occupant classification sensor (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. A scan tool is used to carry out the OCS system reset command. Failure to follow this instruction may result in system failure and the incorrect operation of the OCS system.
- An occupant classification sensor (OCS) system service kit will have the OCS bladder attached to the seat cushion foam pad. Do not separate the OCS bladder from the seat cushion foam pad. Failure to do so can result in component failure.

NOTE: To identify between a production occupant classification sensor (OCS) system and a OCS system service kit, inspect the occupant classification system module (OCSM) electrical connector.

A production OCS system allows the disconnection of the OCSM electrical connector.

An OCS system service kit has the electrical connector glued to the OCSM, it cannot and should not be disconnected or altered.

NOTE:
- The air bag warning indicator illuminates when the restraint 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.
- The heater mat on the front passenger seat cushion is not serviceable separately. If a new heater mat is needed on the front passenger seat cushion, a new OCS system service kit and a new heater mat must be installed.

1. Remove the passenger seat
2. Remove the recliner lever cover.
- Release the recliner lever cover from the locking tab then remove the recliner lever cover.

3. NOTE: Return any detached retainer clips to the side shield before installation.

Remove the seat cushion side shield.
- Remove the 2 screws.
- Release the side and rear retainer clips.

4. Detach the 2 backrest trim cover elastic straps at the rear of the seat cushion frame.
5. Remove the screw from the seat cushion trim cover J-clip behind the front edge of the seat cushion frame.

6. NOTE: Note position of wire routing for installation.

Release all of the seat cushion trim cover J-clips.
- Release the hook-and-loop strip at the rear of the seat cushion.

7. If equipped, disconnect the seat cushion and backrest heater mat electrical connectors.
8. Remove the 2 hog rings attaching the seat cushion trim cover rear flaps to the OCS foam pad.
9. Remove the remaining 6 hog rings and remove the seat cushion trim cover from the OCS foam pad.
10. Remove the seat cushion foam pad from the seat frame.

11. NOTE: Note position of wire routing for installation.

Release the 2 seat wiring harness routing clips from the seat cushion frame.

12. Release the 2 OCS bladder pin-type retainers from the seat cushion pan.
13. Release the pressure sensor bracket retainer and slide the pressure sensor off the bracket.







14. Remove the OCSM.
1 Remove the 2 screws.
2 Release the bracket retainer and slide the OCSM out of the bracket.







15. NOTE: Note position of wire routing for installation.

Route the OCS bladder hose and pressure sensor, OCSM and seat wiring harness out through the seat cushion frame opening.

16. To install, reverse the removal procedure.

17. 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 sensor (OCS) system and increases the risk of serious personal injury or death in a crash.

CAUTION:
- It is necessary to carry out the occupant classification sensor (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. A scan tool is used to carry out the OCS system reset command. Failure to follow this instruction may result in system failure and the incorrect operation of the OCS system. Programming and Relearning
- To prevent system failure, the following precautions must be taken before carrying out the occupant classification sensor (OCS) system reset:
- Make sure the voltage to the occupant classification system module (OCSM) is above 8.0 volts and less than 18.0 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 within the limits, 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 carrying out the OCS system reset and nothing is placed on the seat during the process.
- Make sure a minimum 8-second time period has passed after cycling the ignition switch ON before the carrying out the OCS system reset process.

NOTE: If the first attempt to carry out the OCS system reset is unsuccessful, carry out a thorough visual inspection of the:
- OCS system wiring.
- terminals.
- connectors.
- related seat wiring harness, body wiring harness terminals and connectors.

After the visual inspection, carry out a second OCS system reset attempt. If the second attempt is unsuccessful, a new OCS system service kit must be installed.

Carry out the OCS system reset active command.

18. NOTE: The ignition switch must be cycled after the OCS system reset.

Cycle the ignition switch OFF, then ON.

19. Prove out the SRS as follows:
Turn the ignition key from ON to OFF. Wait 10 seconds, then turn the key back to ON and visually monitor the air bag warning indicator with the air bag modules installed. The air bag warning indicator will light 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 5Hz rate (RCM not configured).

The air bag warning indicator might not light 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 will sound in a pattern of 5 sets of 5 beeps. If this occurs, the air bag warning indicator and any SRS fault discovered must be diagnosed and repaired.

Clear all RCM and OCSM DTCs using a scan tool.
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