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For 1990-2009 cars only
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Figure 1:

Power, Ground, High Speed GMLAN Serial Data
Object Number: 1913323 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Low Speed GMLAN Serial Data (1 of 2)
Figure 2:

Low Speed GMLAN Serial Data (1 of 2)
Object Number: 1913328 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Low Speed GMLAN Serial Data (2 of 2)
Power, Ground, High Speed GMLAN Serial Data
Figure 3:

Low Speed Serial Data (2 of 2)
Object Number: 1913333 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Low Speed GMLAN Serial Data (1 of 2)