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

Vehicle Theft Deterrent (VTD) System


Object Number: 796624  Size: FS
Master Electrical Component List
Theft Systems Description and Operation
Body Control Module
HEADLAMPS, HVAC HI, PWR MIR, HAZARD, RAP, PASS-Key® Fuses and HEADLAMP Circuit Breaker
IP-IGN, CRUISE, ECM Fuses
Indicators
IP-IGN, CRUISE, ECM Fuses
Data Link Communications
G200, S213, S375
G200, S211, S285
Figure 2:

Content Theft Deterrent (CTD) System


Object Number: 796626  Size: FS
Master Electrical Component List
Theft Systems Description and Operation
Theft Deterrent Control Module
PARK LP, RADIO, and STR WHL ILLUM Fuses
Horns
PARK LP, RADIO, and STR WHL ILLUM Fuses
Daytime Running Lamps (DRL) Control Module Inputs
G302, S402, S406, S416
Switches
Door Lock Switches