GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 LaCrosse 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 OnStar Schematics
Figure 1:

Power, Ground, Serial Data, and Antennas
Object Number: 1888931 Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
VCIM to Inside Rearview Mirror
Figure 2:

VCIM to Inside Rearview Mirror
Object Number: 1888933 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
Power, Ground, Serial Data, and Antennas