GM Service Manual Online
For 1990-2009 cars only

Front Seat Lumbar Support Replacement Manual

Removal Procedure

  1. Remove the seat from the vehicle. Refer to Front Seat Replacement - Bucket .
  2. Remove the head restraint and guides. Refer to Head Restraint Replacement .
  3. Remove the seat back cover and pad. Refer to Front Seat Back Cushion Cover and Cushion Pad Replacement .

  4. Object Number: 408110  Size: SH
  5. Detach the lumbar clip from the top of the seat back frame.
  6. Rotate the top of the lumbar mechanism forward in order to unclip the lumbar mechanism from the bottom of the seat back frame.

  7. Object Number: 407184  Size: SH
  8. Disconnect the lumbar cable (6) from the lumbar actuator (5).
  9. Remove the lumbar assembly from the vehicle.

Installation Procedure

  1. Position the lumbar assembly to the seat.

  2. Object Number: 407184  Size: SH
  3. Connect the lumbar cable (6) to the lumbar actuator (5).
  4. Rotate the top of the lumbar mechanism in order to clip the lumbar mechanism onto the bottom of the seat back frame.

  5. Object Number: 408110  Size: SH
  6. Attach the lumbar clip onto the top of the seat frame.
  7. Install the seat back cover and pad. Refer to Front Seat Back Cushion Cover and Cushion Pad Replacement .
  8. Install the head restraint and guides. Refer to Head Restraint Replacement .
  9. Install the front seat in the vehicle. Refer to Front Seat Replacement - Bucket .

Front Seat Lumbar Support Replacement Power Lumbar/Bolster

Tools Required

J 34940 Rivet Gun

Removal Procedure

  1. Remove the front seat from the vehicle. Refer to Front Seat Replacement - Bucket .
  2. Remove the head restraint and guides. Refer to Head Restraint Replacement .
  3. Remove the seat back cover and pad. Refer to Front Seat Back Cushion Cover and Cushion Pad Replacement .

  4. Object Number: 385757  Size: SH
  5. Drill out the rivet holes on the bolster paddles (1).

  6. Object Number: 381500  Size: SH
  7. Detach the lumbar clip from the top of the seat frame.
  8. Remove the lumbar wire from the bottom of the seat frame.
  9. Disconnect the electrical connectors to the motors.
  10. Remove the power lumbar/bolster assembly from the seat.

Installation Procedure

  1. Position the power lumbar/bolster assembly on the seat.
  2. Connect the electrical connectors to the motors.
  3. Fasten the lumbar wire at the bottom of the frame.

  4. Object Number: 381500  Size: SH
  5. Attach the lumbar clip onto the top of the seat frame.

  6. Object Number: 385757  Size: SH
  7. Install the rivets to secure the bolster paddles (1).
  8. Install the seat back cover and pad. Refer to Front Seat Back Cushion Cover and Cushion Pad Replacement .
  9. Install the head restraint and guides. Refer to Head Restraint Replacement .
  10. Install the seat in the vehicle. Refer to Front Seat Replacement - Bucket .