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

Power, Ground, and Sensors


Object Number: 662015  Size: FS
Master Electrical Component List
Battery Voltage to the Rear Fuse Block
Class 2 Serial Data
Seat Belt Schematic
G303, G305, G310, and G404
Figure 2:

Module Controls


Object Number: 670270  Size: FS
Master Electrical Component List
Power, Ground, and Sensors