GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Safety and Security 🢒 Theft Deterrent 🢒 Theft Deterrent System Schematics
Figure 1:

Content Theft Deterrent (CTD) System
Object Number: 1822983 Size: FS
Master Electrical Component List
Content Theft Deterrent (CTD) Description and Operation
Control Module References
Door Modules and Horn
Fuse Block - Left Rear: TV/VICS, ELC SOL, ESC Module, DVR DR Module, Rear Door Module, Theft Shifter and Amp Fuses
Fuse Block - Left Rear Bussing
Fuse Block - Left Rear: TV/VICS, ELC SOL, ESC Module, DVR DR Module, Rear Door Module, Theft Shifter and Amp Fuses
Fuse Block - Right Rear - Lt Turn Signal, RIM 1, Rear Fog Lamp, Ft Pass Door Module, Htd Stg Clm, IGN 1, RIM 2 and Airbag Fuses, Rear Fog Lamp and Ign 1 Relays
G401 (1 of 2)
Figure 2:

Door Modules and Horn
Object Number: 1822988 Size: FS
Master Electrical Component List
Content Theft Deterrent (CTD) Description and Operation
Control Module References
07 STS Theft Deterrent - Content Theft Deterrent (CTD) System
GM LAN - Low Speed 1 of 2
GM LAN - Low Speed 2 of 2
Horn Schematics
Park Lamp Relay, Switch and Instrument Cluster - Domestic