GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 639144  Size: SH
  1. Remove the ignition switch lock cylinder. Refer to Ignition Switch Lock Cylinder Replacement in Instrument Panel, Gages, and Console.
  2. Disengage the retainers (1,2) from the theft deterrent reader/exciter module.
  3. Remove the theft deterrent module (3) from the lock cylinder housing.

Installation Procedure


    Object Number: 639144  Size: SH
  1. Slide the theft deterrent module (3) onto the ignition lock cylinder housing. Verify that the retainers (1,2) are engaged.
  2. Install the ignition switch lock cylinder. Refer to Ignition Switch Lock Cylinder Replacement in Instrument Panel, Gages, and Console.