Inflator Solenoid
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The inflator solenoid has battery voltage to it at all times and is controlled buy the height sensor with providing a ground to the solenoid. The solenoid valve is mounted to the compressor bracket under the vehicle.