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

GMLAN - High Speed
Object Number: 2016291 Size: FS
Figure 2:

GMLAN Low Speed 1 of 2
Object Number: 2016292 Size: FS
Figure 3:

GMLAN Low Speed 2 of 2
Object Number: 2016293 Size: FS
Figure 4:

GMLAN High Speed Serial Data Access
Object Number: 2016297 Size: FS
Figure 5:

Power, Ground
Object Number: 2016299 Size: FS