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

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


Object Number: 2084037  Size: FS
Figure 2:

Power, Ground and High Speed Serial Data (HP7)


Object Number: 2084038  Size: FS
Figure 3:

Low Speed Serial Data


Object Number: 2084040  Size: FS