On W-Body vehicles, the front seats are secured to the floorpan by two front hook attachments and two rear bolts installed to nuts welded to the floorpan.
The manually operated two-way front adjusters provides only fore and aft movement of the seat. When the seat adjuster handle located on the front seat is pulled up, the seat adjusters unlock, permitting travel of the seat. When the seat is in the desired position and the seat adjuster handle is released, the seat locks in place.
A power operated six-way seat adjuster is available. The adjusters are activated by three 12 volt, reversible, permanent magnet motors with a built-in circuit breaker. The motors are energized by a switch bolted on the seat side panel.
The three motors drive the front seat and rear vertical actuators and a horizontal actuator. When the adjusters reach the limit of travel, torque is absorbed through the rubber mounted grommets located between the motor and the support. An overload relay is provided in the circuit and will open should excessive stall be applied.
The optional 60/40 split bench front seats have seat back head restraints on the driver's and passenger's seat back. The head restraints are designed so they cannot be removed from the seat back without first inserting a small rounded tool inside the head restraint support tube to release the locking tab. The 60/40 split bench seat is equipped with a reclining mechanism on both the driver's and passenger's side. The recliner lever is located on the outboard side of the spring cushion. When the lever is pulled upward, the spring loaded dual linear reclining unit located in the cushion frame is released, allowing the seat back to be pushed rearward or allowing the spring loaded reclining unit to bring the seat back forward.
Bucket seats are equipped with manual reclining mechanisms. An optional six-way power seat adjuster is available. Some bucket seats are equipped with inertia seat back locks. This system allows the seat back to fold forward without requiring the occupant to release a locking lever or access to the rear seat area. During a sudden stop or deceleration, or if the front of the vehicle is nose down, the inertia system of the seat back lock will engage, holding the seat back in its rest position. The release lever is located at the lower rear outboard corner of the seat back.
Some W-Body vehicles (notably Pontiac coupes) have passenger front seats equipped with an E-Z Entry device. This is actuated, in an unoccupied seat, by completely folding the seat back forward disengaging the adjuster, and sliding the front seat forward to gain access to the rear seat area. To return the seat to its normal position, return the seat back to its rest position, and slide the entire seat rearward, engaging the adjuster.
W-Body rear seats are available in several styles including a rear seat with an integral child restraint device.
Power Seat Motor
The six-way power seat adjusters are actuated by three 12V, reversible permanent magnet motors with built in circuit breakers. The motors drive the front and rear vertical gearnuts and a horizontal actuator. When the adjusters are at their limit of travel, an overload relay provides stall torque so the motors are not overloaded. Each motor can be serviced as a separate unit.Removal & Installation
- Disconnect the negative battery cable.
- Remove the seat assembly from the vehicle as outlined in this section.
- Place the seat with the adjuster assembly attached upside down on a clean, protected surface. Do not leave a seat upside down on the cushion or damage to the cushion may occur.
- Detach the electrical connectors, as equipped.
Remove the finish panels using the following procedure:
- Remove the recliner handle. Use a small flat-bladed tool to carefully release the wire retainer from the base of the recliner handle.
- Remove the finish panel screws.
- Pull the finish panel away from the seat cushion frame to release the clips. Discard the clips. GM specifies that new clips must be used at assembly.
- Detach the power seat electrical connector.
- Remove the finish panel from the seat.
- Remove the adjuster-to-seat cushion frame bolts.
- Separate the adjuster assembly from the seat frame.
- Disconnect the drive cables by squeezing the oblong connector at the motors and the vertical/horizontal actuators. To gain access to the cable connector at the motor for the inboard (passenger side) or outboard (driver's side) rear vertical gearnut, initial removal of the nut securing the motor support bracket is suggested.
- If necessary, separate the left and right adjusters by unbolting the crossbrace.
- Tag for identification the electrical connectors. With the electrical wiring harness connectors detached from the motors, remove the nut securing the actuator motor bracket to the seat adjuster assembly.
- If not already done, remove the cables from the motors.
- Remove the defective motor as required.
- Install the replacement motor(s) as required.
- Connect the cables to the motors.
- Install the nut securing the actuator motor bracket to the seat adjuster assembly. Tighten to 89 inch lbs. (10 Nm).
Attach the electrical connectors to the motors.
- The black connector goes to the front vertical motor.
- The blue connector goes to the rear vertical motor.
- The white connector goes to the horizontal motor.
- Installation is the reverse of the removal process. Attach the crossbrace to the left and right adjusters making sure the tab bending downward at the center of the crossbrace faces the rear of the adjusters. Secure with the two bolts, tightened to 53 ft. lbs. (6 Nm).
Removal & Installation
Remove the adjuster track covers, as follows:
- Unsnap the track covers from the front of the adjusters (manual and power adjusters).
- Remove the track cover screw from the rear of the adjusters (manual seat adjuster only).
- Unsnap the track covers from the rear of the adjusters (power adjusters).
- Move the seat to the full forward and full up position.
- Remove the retractor side seat belt anchor from the seat.
- Remove the seat adjuster-to-floorpan bolts.
- Detach the power seat electrical connector, if equipped.
- Detach the seat belt reminder electrical connector, driver's side only.
- Disengage the front hook attachments.
- Remove the front seat from the vehicle.
- With an assistant, install the seat assembly into place and engage the front hook attachments.
- Attach all electrical connectors.
- Operate the seat to the full forward, full up position.
- Install the retractor side belt anchor to the seat.
- Install the adjuster-to-floorpan bolts and tighten to 18 ft. lbs. (24 Nm).
- Install the adjuster track covers.
- Cycle the seat (six-way power) to ensure proper operation and synchronization of the left and front adjusters.
- Locate and remove the small bolts at the front lower edge of the seat cushion.
- Pull the tabs on the rear cushion retainers.
- Remove the seat cushion by lifting up and pulling out of the retainer.
- Installation is the reverse of the removal procedure. Make sure the retainer tabs are snapped into place. Tighten the bolts to 18 ft. lbs. (25 Nm).
- Remove the seat cushion as described above.
- Remove the anchor nuts securing the rear seat retainer at the bottom of the seat back.
- Grasp the bottom of the seat back and swing upward to disengage the offsets on the upper frame bar from the hangers.
- Lift the seat back upwards to remove from the vehicle.
- Installation is the reverse of the removal process. Make sure the hooks on the seat back are properly installed to the hangers. Tighten the anchor nuts to 89 inch lbs. (10 Nm).