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

OnStar - UE1


Object Number: 1680113  Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
Data Link Communications
Cellular Communication Schematic Icons
Cellular Communication Schematic Icons
Cellular Communication Schematic Icons
Rear Fuse Block B+
Power, Ground, and Low Speed GMLAN
G402
G305
Figure 2:

Data Link Communication


Object Number: 1680115  Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
UE1
Power, Ground, and Low Speed GMLAN
High Speed Serial Data