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

High Speed GMLAN


Object Number: 1883487  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Low Speed GMLAN
Figure 2:

Low Speed GMLAN


Object Number: 1883488  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Serial Data Communication Enable and Accessory Wake Up
High Speed GMLAN
Figure 3:

Serial Data Communication Enable and Accessory Wake Up


Object Number: 1883496  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Low Speed GMLAN