GM Service Manual Online
For 1990-2009 cars only
  1. Remove the upper and lower trim covers. Refer to Steering Column Trim Covers - Disassemble - Off Vehicle .

  2. Object Number: 373859  Size: SH
  3. Put the key in the steering column lock cylinder set (1).
  4. Turn the key to the START position.
  5. Install a one sixteenth allen wrench into the hole on top of the lock module assembly (2) to release the steering column lock cylinder set retaining pin.
  6. Turn the steering column lock cylinder set (1) into the RUN position.
  7. Pull the steering column lock cylinder set (1) out from the lock module assembly.
  8. Remove the key from the steering column lock cylinder set (1).