GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 636625  Size: SH
  1. Remove the steering column filler panel.
  2. Place the ignition switch in the "LOCK" position and remove the key.

  3. Object Number: 378830  Size: SH
  4. Disconnect the electrical connector.
  5. Remove the hexagon nut (4) from the dimmer and ignition switch mounting stud.
  6. Remove the washer head screw (3).
  7. Remove the dimmer switch actuator rod (5) out of the slot on the dimmer switch assembly (2).
  8. Remove the dimmer switch assembly (2) from the ignition switch assembly (1).

Installation Procedure


    Object Number: 378830  Size: SH
  1. Install the dimmer switch assembly (2) onto the ignition switch assembly (1).
  2. Important: You must remove all the lash from the dimmer switch actuator rod before tightening any screws.

  3. Install the dimmer switch actuator rod (5) into the slot on the dimmer switch assembly (2).
  4. 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.

  5. Install the washer head screw (3).
  6. Install the hexagon nut (4) onto the dimmer and ignition switch mounting stud.
  7. Tighten

        • Tighten the screw to 4 N·m (35 lb  in).
        • Tighten the nut to 4 N·m (35 lb in).
  8. Connect the electrical connector.

  9. Object Number: 636625  Size: SH
  10. Install the steering column filler panel.