GM Service Manual Online
For 1990-2009 cars only
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Figure 1:

Power, Ground, DLC and MIL
Object Number: 1921985 Size: FS
Figure 2:

Engine Data Sensors - Pressure, Temperature and VSS
Object Number: 1921988 Size: FS
Figure 3:

Engine Data Sensors - Oxygen Sensors
Object Number: 1921991 Size: FS
Figure 4:

Throttle Body Actuator
Object Number: 1921995 Size: FS
Figure 5:

Ignition Controls
Object Number: 1921999 Size: FS
Figure 6:

Fuel Pump Controls
Object Number: 1922001 Size: FS
Figure 7:

Fuel Injectors, Octane Selector and Rough Road WSS
Object Number: 1922003 Size: FS
Figure 8:

EVAP and Device Controls
Object Number: 1922013 Size: FS
Figure 9:

Controlled/Monitored Subsystem References
Object Number: 1922028 Size: FS