GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 OnStar Schematics
Figure 1:

OnStar - UE1
Object Number: 1794989 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
Data Link Communication
Entertainment/Communication Schematic Icons
Entertainment/Communication Schematic Icons
Entertainment/Communication Schematic Icons
Rear Fuse Block B+
G402
Power, Ground, and Low Speed GMLAN
G305
Figure 2:

Data Link Communication
Object Number: 1794997 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
UE1
Power, Ground, and Low Speed GMLAN
High Speed Serial Data