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

Relay, Switch, Solenoid and Compressor Assembly


Object Number: 1232745  Size: LF
(1)Inflator Air Switch
(2)Inflator Soleniod
(3)Automatic Level Control (ALC) Compressor
(4)Exhaust Solenoid
(5)Automatic Level Control (ALC) Compressor Relay
Figure 2:

Automatic Level Control (ALC) Sensor


Object Number: 772910  Size: LF
(1)Auto Level Control (ALC) Sensor