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

Power, Ground, and High Speed Serial Data (without HP7)


Object Number: 2082170  Size: FS
Figure 2:

Power, Ground, and High Speed Serial Data (HP7)


Object Number: 2082171  Size: FS
Figure 3:

Low Speed Serial Data


Object Number: 2082172  Size: FS