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

Power, Ground, and High Speed Serial Data (without HP7)
Object Number: 1988280 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Power, Ground, and High Speed Serial Data (HP7)
Figure 2:

Power, Ground, and High Speed Serial Data (HP7)
Object Number: 1988281 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Low Speed Serial Data
Power, Ground, and High Speed Data (without HP7)
Figure 3:

Low Speed Serial Data
Object Number: 1988283 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Power, Ground, and High Speed Serial Data (HP7)