GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Theft Deterrent Control Module


Object Number: 623196  Size: FS
Master Electrical Component List
Vehicle Theft Deterrent (VTD) Description and Operation
Door Lock Actuators
License Plate Lamps, Park Lamp Relay
Horns
Serial Data Class 2
Battery Feed to the Fuse Block-Underhood
IGN SW (Fuse Block-Rear)
IGN SW Fuse (Fuse Block-Rear)
IGN SW Fuse (Fuse Block-Rear)
G201 (2 of 2)
G201 (2 of 2)
Figure 2:

Door Lock Actuators


Object Number: 623197  Size: FS
Master Electrical Component List
Content Theft Deterrent (CTD) Description and Operation
Theft Deterrent Control Module
Serial Data Class 2