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

Vehicle Theft Deterrent (VTD) System


Object Number: 661257  Size: FS
Master Electrical Component List
Vehicle Theft Deterrent (VTD) Description and Operation
Content Theft Deterrent (CTD) System
Battery Voltage Supply to Underhood Fuse Blocks
Rear Fuse Block- CRK, PCM/CRU and SBM Fuses
Rear Fuse Block- CRK, PCM/CRU and SBM Fuses
Rear Fuse Block- CRK, PCM/CRU and SBM Fuses
Class 2 Serial Data Line
G202 (1 of 4)
G202 (2 of 4)
Figure 2:

Content Theft Deterrent (CTD) System


Object Number: 661259  Size: FS
Master Electrical Component List
Content Theft Deterrent (CTD) Description and Operation
Door Latch Switches
Vehicle Theft Deterrent (VTD) System
Battery Voltage Supply to Underhood Fuse Blocks
Left Underhood Fuse Block- OXY SEN and SBM LCM Fuses
I/P Fuse Block- WSW/RFA and WSW Fuses
I/P Fuse Block- WSW/RFA and WSW Fuses
Left Underhood Fuse Block- BAT 2 Fuse/ Rear Fuse Block- PWR SEAT Circuit Breaker, MEM/RFA Fuse
Class 2 Serial Data Line
Horns Schematics
Indicators
Figure 3:

Door Latch Switches


Object Number: 661261  Size: FS
Master Electrical Component List
Content Theft Deterrent (CTD) Description and Operation
Content Theft Deterrent (CTD) System
Class 2 Serial Data Line