GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C Sierra - 2WD 🢒 Body and Accessories 🢒 Seats 🢒 Driver or Passenger Seat Back Cushion Frame Replacement

Removal Procedure
  1. Remove the seat from the vehicle. Refer to Front Seat Replacement - Bucket .
  2. Remove the head restraints and guides. Refer to Front Seat Head Restraint Replacement .

    3. Object Number: 378528 Size: SH
  3. Remove the seat trim panel. Refer to Front Seat Trim Panel Replacement .

    4. Object Number: 407184 Size: SH
  4. Unsnap the lumbar cable (6) underneath the seat cushion (disconnect the lumbar wire harness if equipped with power lumbar).
  5. Remove the seat back trim cover and pad. Refer to Front Seat Back Cushion Cover and Cushion Pad Replacement .
  6. Remove the lumbar assembly (or power lumbar/bolster assembly if equipped). Refer to Front Seat Lumbar Support Replacement .
  7. Remove the seat belt retractor. Refer to Seat Belt Retractor Replacement - Left Front (right) or Seat Belt Retractor Replacement - Right Front (left) in Seat Belts.

    8. Object Number: 386187 Size: SH
  8. Remove the inboard pivot bolt (1).
  9. Remove the recliner arm attachment bolts (2).
  10. Remove the frame from the vehicle.
  11. Transfer all necessary components to the new seat back frame.

Installation Procedure
  1. Position the seat back frame on the seat.

    2. Object Number: 386187 Size: SH

    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.

  2. Install the recliner arm attachment bolts (2).

    3. Tighten
    Tighten the bolts to 53 N·m (39 lb ft).

  3. Install the inboard pivot bolt (1).

    4. Tighten
    Tighten the bolt to 35 N·m (26 lb ft).

  4. Install the seat belt retractor. Refer to Seat Belt Retractor Replacement - Left Front (right) or Seat Belt Retractor Replacement - Right Front (left) in Seat Belts.
  5. Install the lumbar assembly (or power lumbar/bolster assembly if equipped). Refer to Front Seat Lumbar Support Replacement .
  6. Install the seat back trim cover and pad. Refer to Front Seat Back Cushion Cover and Cushion Pad Replacement .

    7. Object Number: 407184 Size: SH
  7. Connect the lumbar cable (6) underneath the seat cushion (disconnect the wire harness if equipped with power lumbar).

    8. Object Number: 378528 Size: SH
  8. Install the seat trim panel. Refer to Front Seat Trim Panel Replacement .
  9. Install the head restraints and guides. Refer to Front Seat Head Restraint Replacement
  10. Install the seat into the vehicle. Refer to Front Seat Replacement - Bucket .