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

Vehicle Theft Deterrent (VTD) System


Object Number: 1485620  Size: FS
Master Electrical Component List
Vehicle Theft Deterrent (VTD) Description and Operation
Control Module References
Content Theft Deterrent (CTD) System
LY7
L26
G202
Figure 2:

Content Theft Deterrent (CTD) System


Object Number: 1485623  Size: FS
Master Electrical Component List
Content Theft Deterrent (CTD) Description and Operation
Control Module References
Vehicle Theft Deterrent (VTD) System
Switches
Ajar Indicators
Horns Schematics
Headlights/Daytime Running Lights (DRL) Schematics
Park Lamps
Body Rear End Schematics
Ajar Indicators
Courtesy Lamps
G202
G302