Front Seat Cushion
FRONT SEAT CUSHIONWorldwide Diagnostic System:
Special Tool(s)
Disassembly
WARNING:
- Always wear safety glasses when repairing an air bag supplemental restraint system (SRS) vehicle and when handling an air bag module. This will reduce the risk of injury in the event of an accidental deployment.
- To reduce the risk of personal injury, do not use any memory saver devices.
- Do not separate the occupant classification sensor (OCS) components.
CAUTION:
- It is necessary to rezero the occupant classification sensor (OCS) system when a front passenger seat cushion is disassembled, a new trim cover is installed, or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out rezeroing of the OCS system.
- If replacing only the front passenger seat cushion trim cover, the occupant classification sensor must be rezeroed.
NOTE:
- OCS system components (seat cushion pan, seat cushion foam pad, bladder with pressure sensor and electronic control unit) are calibrated to each other and are serviced as an assembly. The OCS system components are not to be installed separately. If a new OCS system, OCS system component or seat cushion foam pad are needed, a new OCS system service kit (seat cushion pan, seat cushion foam pad, bladder with pressure sensor and electronic control unit) must be installed as an assembly.
- To identify between a production OCS system and a service OCS system (OCS service kit) inspect the electronic control unit (ECU) electrical connector. A production OCS system allows the disconnect of the ECU electrical connector. A service OCS system (OCS service kit) has the ECU electrical connector glued to the ECU, it cannot and should not be disconnected or altered.
- If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the supplemental restraint system (SRS) must be depowered.
- The air bag warning lamp illuminates when the 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.
All seats
1. Depower the supplemental restraint system (SRS).
2. Remove the front seat.
3. Remove the front seat cushion.
Three-door and five-door driver seats
4. CAUTION: While positioning the seat cushion pan and occupant classification sensor (OCS) assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
Detach the cushion cover from the underside of the seat.
- Detach the retaining cord.
- Cut the hog rings.
All passenger seats and four-door and wagon driver seats
5. CAUTION: While positioning the seat cushion pan and occupant classification sensor (OCS) assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
Detach the front edge of the seat cover.
- Detach the retaining strip.
6. Remove the hog rings.
All seats
7. NOTE: Note the position of the anti-squeak mat.
Remove the cushion from the seat base.
- If equipped with heated seats, separate the wire harness from the cushion pan.
8. CAUTION: If replacing only the front passenger seat cushion trim cover, the occupant classification sensor must be rezeroed.
Separate the trim cover from the cushion foam pad.
1 Roll the trim cover back to access the hog rings.
2 Remove the hog rings.
Heated seats
9. CAUTION: Remove the paper strips covering the adhesive before adhering the heater mat to the foam pad. Otherwise damage to the seal can occur.
NOTE: A new heated seat mat can be attached to a foam pad where an old heated seat mat was removed. A used heated seat mat should not be reattached to any foam pad.
If a new heated seat element is to be installed to the existing foam pad, carefully separate and remove the cushion heated seat element from the foam pad.
Assembly
Passenger seat
1. The belt tension sensor wire harness is routed between the occupant classification sensor (OCS) electronic control unit (ECU) and mounting bracket.
Heated seats
2. CAUTION: Remove the paper strips covering the adhesive before adhering the heater mat to the foam pad. Otherwise damage to the seat can occur.
NOTE: A new heated seat mat can be attached to a foam pad where an old heated seat mat was removed. A used heated seat mat should not be reattached to any foam pad.
If necessary, install the heated seat element to the seat cushion foam pad.
All seats
3. CAUTION: Inspect the components for any foreign objects before installing the seat cushion trim cover. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
NOTE: Use hog ring pliers to close the hog rings. Do not use any other tool. The hog rings must be closed to overlap as illustrated.
Position the trim cover to the foam pad and install the hog rings in the same places as during removal.
4. CAUTION: Inspect the components for any foreign objects before installing the seat cushion trim cover. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
Position the foam pad and trim cover to the seat cushion pan.
All passenger seats and four-door and wagon driver seats
5. Install the hog rings.
6. Attach the front edge J-clip of the cushion trim cover to the cushion pan.
Three-door and five-door driver seats
7. Install the hog rings and attach the retaining cord.
All seats
8. Install the front seat cushion.
9. Install the seat.
10. Repower the SRS. Do not prove out the SRS at this time.
Passenger seat only
11. WARNING: Do not separate components.
CAUTION:
- It is necessary to rezero the OCS system when a front passenger seat cushion is disassembled, a new trim cover installed, or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out rezeroing of the OCS system.
- Make sure the seat is completely assembled before rezeroing.
- The following precautions must be taken before rezeroing the OCS system:
- Make sure the OCS system components are connected and no faults are present.
- Make sure the OCS system is not at a temperature below 0°C (32°F) or above 45°C (113°F) when initiating the rezeroing 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, 0°C to 45°C (32°F to 113°F) for a minimum of 30 minutes.
- Make sure nothing is present on the passenger seat before rezeroing and nothing is placed on the seat during the rezeroing process.
- Make sure a minimum eight second time period has passed after cycling the ignition switch ON before the rezeroing process.
NOTE:
- For best results in rezeroing, the OCS system should be at or near room temperature, 10°C to 29°C (50°F to 85°F).
- When using an NGS+ (NGS with Vehicle Communication Module (VCM) and the latest software update) to rezero the OCS system.
- select "FUNCTION TEST"
- select "SYSTEM RESET"
- view the on-screen information, then press "TRIGGER"
The NGS+ screen will then display "OCS RESET: REZERO." Press "DONE" (button 8) to rezero the OCS system. The NGS+ will display "TEST/FUNCTION SUCCESSFUL" once rezeroing of the OCS system is complete.
NOTE: To rezero the OCS system using the Worldwide Diagnostic System (WDS):
- select the "Toolbox" icon
- select "Body" from the menu
- select "Restraints" from the menu
- select "Seat Weight Sensor ReZero"
After selecting: "Seat Weight Sensor ReZero", follow the on-screen prompts to carry out rezeroing of the OCS system.
NOTE: If the first attempt to rezero the OCS system is unsuccessful, a second attempt must be made.
Rezero the occupant classification sensor.
- With the front passenger seat empty, use a scan tool to trigger the active command and rezero the occupant classification sensor.
12. NOTE: The ignition switch must be cycled after rezeroing the OCS system.
Cycle the ignition switch from ON to OFF.
All seats
1G13. Prove out the supplemental restraint system (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 indicator with the air bag modules installed. The air bag indicator will light continuously for approximately six seconds and then turn off. If an air bag supplemental restraint system (SRS) fault is present, the air bag indicator will either:
- fail to light.
- remain lit continuously.
- flash.
The flashing might not occur 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 restraints control module (RCM) to complete the testing of the SRS. If the air bag indicator is inoperative and a SRS fault exists, a chime will sound in a pattern of five sets of five beeps. If this occurs, the air bag indicator and any SRS fault discovered must be diagnosed and repaired.
Clear all continuous DTCs from the restraints control module using a scan tool.