GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Power Moding Schematics
Figure 1:

IGN I/II
Object Number: 2082050 Size: FS
Figure 2:

IGN II/III
Object Number: 2082056 Size: FS