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

Class 2


Object Number: 946666  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
GMLAN
SIR Caution for Zoning
Figure 2:

GMLAN


Object Number: 946669  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Class 2
Computer/Integrating Systems Schematic Icons