GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Moveable Window Schematics
Figure 1:

Front Window Switches and Motors
Object Number: 2081381 Size: FS
Figure 2:

Rear Window Switches and Motors
Object Number: 2081385 Size: FS