Removal Procedure

Fig 1: Identifying Theft Deterrent Exciter Module

GM639144

Courtesy of GENERAL MOTORS CORP.

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