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

Power, Ground, MIL and DLC
Object Number: 2081332 Size: FS
Figure 2:

Engine Data Sensors - 5V Reference Bussing
Object Number: 2081334 Size: FS
Figure 3:

Engine Data Sensors - Pressure, Temp and MAF/IAT
Object Number: 2081339 Size: FS
Figure 4:

Engine Data Sensors - HO2S
Object Number: 2081339 Size: FS
Figure 5:

Engine Data Sensors - APP and Throttle Body Assembly
Object Number: 2081349 Size: FS
Figure 6:

Ignition Controls 1 of 2
Object Number: 2081352 Size: FS
Figure 7:

Ignition Controls 2 of 2
Object Number: 2081355 Size: FS
Figure 8:

Fuel Controls
Object Number: 2081357 Size: FS
Figure 9:

CKP, CMP, Knock Sensors
Object Number: 2081359 Size: FS
Figure 10:

EVAP Controls, FTP Sensor
Object Number: 2081361 Size: FS
Figure 11:

EGR, Secondary Air Injection (AIR)
Object Number: 2081362 Size: FS
Figure 12:

Controlled and Monitored Subsystem References
Object Number: 2081364 Size: FS