GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 771103  Size: SH

    Important: When removing the lumbar support knob from the seat back, have a replacement part available. The original part may break during removal.

  1. Remove the lumbar support knob by using one of the following methods:
  2. • Pull on the knob while twisting the knob from side to side.
    • The lumbar knob may have 2 small openings on the housing that slide onto the lumbar drive shaft. A retaining tab slides into each opening when the knob is pressed onto the drive shaft.To remove the knob, slide a flat-bladed tool under the knob housing near an opening and twist the tool to break the plastic housing, freeing the housing from the retaining tab.
  3. Remove the lumbar knob from the seat.

Installation Procedure


    Object Number: 771103  Size: SH
  1. Align the retaining tabs on the lumbar drive shaft with the holes in the knob housing.
  2. Press the knob onto the shaft until the knob is seated.