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

Vehicle Theft Deterrent (VTD) System


Object Number: 711016  Size: FS
Master Electrical Component List
Battery Voltage to the Rear Fuse Block
IGN SW, PRK/REV Fuses and the PARK and REVERSE Relays (Fuse Block -Rear)
Ignition Switch Positions
Ignition Switch Positions
Battery Feed to the Fuse Block - Underhood
ABS, PCM BATT Fuses and the COOLFAN 1 Relay ( Fuse Block - Underhood)
G201 (2 of 2)
G201 (2 of 2)
Class 2 Serial Data
Horn Schematic
Low Beam Headlamps
Content Theft Deterrent (CTD) System
Figure 2:

Content Theft Deterrent (CTD) System


Object Number: 711020  Size: FS
Master Electrical Component List
Class 2 Serial Data
Vehicle Theft Deterrent (VTD) System
Indicators - VTD and CTD
Figure 3:

Indicators - VTD and CTD


Object Number: 711022  Size: FS
Master Electrical Component List
Class 2 Serial Data
G201 (1 of 2)
G201 (1 of 2)
Content Theft Deterrent (CTD) System