GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Door Lock/Indicator Schematics
Figure 1:

Driver Door Module Power and Ground
Object Number: 2081889 Size: FS
Figure 2:

Front Passenger Door Module Power and Ground
Object Number: 2081893 Size: FS
Figure 3:

Door Lock, Unlock Relays
Object Number: 2081898 Size: FS
Figure 4:

Rear Door Latch Assemblies
Object Number: 2081901 Size: FS