Overhaul
SEAT CUSHION - FRONTSpecial Tool(s)
Special Tool(s):
Driver Power Front Seat Cushion:
Driver Manual Front Seat Cushion:
Passenger Manual Front Seat Cushion:
Passenger Power Front Seat Cushion:
Disassembly
WARNING:
- Install a new occupant classification sensor (OCS) system service kit as a complete assembly. Never install only part of the kit components. 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.
- Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
CAUTION: To prevent system failure, 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 installed or an OCS system service kit is installed. A scan tool is used to carry out the OCS system reset command.
NOTE:
- OCS system components (seat cushion foam pad, bladder with pressure sensor and occupant classification system module (OCSM) module) 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 component or seat cushion foam pad are needed, a new OCS system service kit (seat cushion foam pad, bladder with pressure sensor, OCSM and seat wire harness) must be installed as an assembly.
- 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.
- 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.
- When installing an occupant classification sensor (OCS) system service kit, refer to Air Bag Systems for the OCS service kit installation procedure.
- If a driver or passenger seat cushion heater mat is faulty, a new seat cushion foam pad must be installed with the heater mat. Do not reuse the original seat cushion foam pad.
When installing an OCS service kit equipped with heated seats, a new cushion heater mat must be installed. Do not reuse the OEM OCS driver cushion heater mat. The OCS service kit does not come with a new cushion heater mat.
- The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
All seats
1. Remove the front seat.
2. Remove the front seat backrest.
3. Remove the seat track.
Power driver seat
4. Disconnect the seat control switch and lumbar control switch (if equipped) and remove the cushion side shield.
5. Release the retainers and remove the seat control switch and the lumbar control (if equipped) switch from the cushion side shield.
6. Disconnect the heated seat electrical connectors (if equipped).
Power passenger seat
7. Disconnect the seat control switch and remove the cushion side shield.
8. Release the retainers and remove the seat control switch from the cushion side shield.
9. Disconnect the heated seat electrical connectors (if equipped).
Manual driver and all passenger seats
10. Release the cushion trim cover rear J-strip.
Driver seat and passenger seat with OEM occupant classification system (OCS)
11. Remove the cushion foam pad and cushion trim cover from the cushion frame.
Passenger seats with OEM OCS or OCS system service kit
12. CAUTION: To prevent system failure, do not oversize the seat cushion frame holes used to rivet the occupant classification system module (OCSM) in place.
NOTE: OEM OCSM shown, OCS system service kit similar.
Using a 5 mm (0.19 in) drill, remove the 2 rivets and separate the OCSM from the cushion frame.
13. NOTE: OEM OCS pressure sensor shown, OCS system service kit pressure sensor similar.
Bend to release the tab and remove the pressure sensor from the bracket.
14. NOTE: Note wire harness routing for installation.
Release any seat wire harness routing pin-type retainers from the cushion frame.
Passenger seat with OEM OCS
15. Remove the OCS bladder pin-type retainers.
Passenger seats with OEM OCS or OCS system service kit
16. NOTE: Note the cushion frame opening that the OCS components and seat wire harness are being routed through for installation.
Remove the OCSM and seat wire harness from the cushion frame.
- Feed the hose, pressure sensor, wire harness, electrical connectors and OCSM through the opening in the cushion frame.
Driver seat
17. NOTE: Note wire harness routing for installation.
Release any pin-type retainer(s) and remove the seat wire harness from the cushion frame.
All seats
18. CAUTION: Use care when separating the seat cushion trim cover from the hook-and-loop strip, or the hook-and-loop strip can be torn from the seat cushion foam.
Separate the hook-and-loop strips, remove the hog rings and separate the cushion trim cover from the cushion foam pad.
Assembly
All seats
1. Position the cushion trim cover to the cushion foam pad, attach the hook-and-loop strips and install the hog rings.
Driver seat
2. Route the seat wire harness to the cushion frame and attach the pin-type retainer(s) as noted during removal.
Passenger seats with OEM OCS or OCS system service kit
3. WARNING: Install a new occupant classification sensor (OCS) system service kit as a complete assembly. Never install only part of the kit components. 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.
CAUTION:
- Failure to route the seat occupant system components through the correct seat cushion support opening can cause component failure.
- While positioning the seat cushion frame and occupant classification system assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
Position the OCS components and seat wire harness through the cushion frame opening as noted during removal.
- Feed the hose, pressure sensor, wire harness, electrical connectors and OCSM through the opening in the cushion frame.
Passenger seat with OEM OCS
4. Install the OCS bladder pin-type retainers.
Passenger seats with OEM OCS or OCS system service kit
5. Position the OCSM onto the seat cushion pan bracket and install the new rivets.
- The OCSM must be correctly positioned and securely riveted in place. Failure to do so can set a DTC in the restraints control module (RCM).
6. Bend the retaining tab back on the pressure sensor bracket.
7. Install the pressure sensor onto the cushion frame bracket, making sure the retaining tab is completely engaged.
- When installed correctly, an audible click will be heard and the pressure sensor will not be able to be removed from its bracket without disengaging the retaining tab.
8. Attach any seat wire harness routing pin-type retainers to the cushion frame as noted during removal.
Power driver seat
9. Install the seat control switch and the lumbar control switch into the cushion side shield.
- Install the seat control switch knob.
10. Position the cushion side shield to the cushion frame and connect the seat control switch and lumbar control switch.
All seats
11. Position the cushion foam pad and trim cover to the cushion frame.
12. Install the seat track.
13. Install the seat backrest.
14. Install the seat.
15. Repower the SRS. If the passenger seat has been serviced, do not prove out the SRS at this time.
Passenger seat
16. WARNING:
- Install a new occupant classification sensor (OCS) system service kit as a complete assembly. Never install only part of the kit components. 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.
- 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:
- To prevent system failure, 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 installed or an OCS system service kit is installed. A scan tool is used to carry out the OCS system reset command.
- 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 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 occupant classification sensor (OCS) system reset is unsuccessful, a second attempt must be made. If the second attempt is unsuccessful, a new OCS system service kit must be installed.
Carry out the OCS system reset active command.
17. Cycle the ignition switch from ON to OFF.
18. NOTE: The ignition switch must be cycled after the OCS system reset.
Cycle the ignition switch from OFF to ON.
All seats
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 continuous DTCs from the RCM using a scan tool.