GM Service Manual Online
For 1990-2009 cars only

Object Number: 280450  Size: SH

The following components secure the front seats to the floor pan:

    • Two front hook attachments
    • Two rear bolts installed to nuts that are welded to the floor pan

Object Number: 280439  Size: SH

The manually operated 2-way front adjusters provide only fore and aft movement of the seat. The seat adjuster handle is located on the front side of the seat. When the seat adjuster handle is pulled up, the seat adjusters (1) unlock. This action permits travel of the seat. When the seat is in the desired position, and the seat adjuster handle is released, the seat locks into place.


Object Number: 280446  Size: SH

The power operated 6-way seat adjuster (1) (driver's side only) is activated by 3 motors. These motors possess the following characteristics:

    • 12 volt
    • Reversible
    • Permanent magnet motors
    • Built-in circuit breaker

A switch mounted on the seat cushion outer trim panel energizes the motors.

The 3 motors drive the following components:

    • A front vertical actuator
    • A rear vertical actuator
    • A horizontal actuator

When the adjusters reach the limit of travel, torque is absorbed through the rubber mounted grommets. The grommets are located between the motor and the support. The circuit provides an overload relay if excessive torque is applied to the motor.

Removal Procedure


    Object Number: 280446  Size: SH
  1. Remove the seat adjuster covers (2). The covers snap to the seat adjusters in the front and rear.

  2. Object Number: 280454  Size: SH
  3. Position the front seat forward in order to gain access to the seat adjuster attaching bolts(1).
  4. Remove the seat adjuster attaching bolts (1).
  5. Disconnect the seat belt wiring harness (driver's side only).
  6. Disconnect the power seat electrical connector, if equipped (driver's side only).
  7. Remove the front seat. Manually tilt the seat forward in order to disengage the hooks from the floor pan.

Installation Procedure

  1. Install the front seat. Manually tilt the seat forward in order to engage the hooks to the floor pan.
  2. Connect the power seat electrical connector, if equipped (driver's side only).
  3. Connect the seat belt wiring harness (driver's side only).

  4. Object Number: 280454  Size: SH
  5. Position the front seat forward in order to gain access to the seat adjuster attaching bolts (1).
  6. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the seat adjuster bolts (1).
  8. Tighten
    Tighten the seat adjuster bolts (1) to 40 N·m (30 lb ft).

  9. Install the adjuster covers. Ensure that the units lock into place.