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

Power, Ground and Low Speed GMLAN
Object Number: 1886773 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed Serial Data
Figure 2:

High Speed Serial Data
Object Number: 1886776 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
Power, Ground and Low Speed GMLAN
Serial Data Wake Up
Figure 3:

Serial Data Wake Up
Object Number: 1886778 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed Serial Data