GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 639144  Size: SH
  1. Remove the lock cylinder. Refer to Ignition Switch Lock Cylinder Replacement .
  2. Use a small flat bladed tool to gently pry outward at the tabs (1, 2) to disengage the exciter module (3) from the key cylinder (4).
  3. Remove the theft deterrent exciter module from ignition lock cylinder case assembly.

Installation Procedure


    Object Number: 639144  Size: SH
  1. Install the theft deterrent exciter module (3) onto the ignition lock cylinder case assembly (4).
  2. Install the lock cylinder. Refer to Ignition Switch Lock Cylinder Replacement .