RE: How do I shut the air compresser off???
I don't agree with disconnecting the air suspension module as a way to disable the air ride. Remember that the air suspension module handles more than just the air, it also handles the EVO (Electronic Variable Orifice) for the steering. The steering should go to full effort by default, which at higher speeds, may make the car drive funny.
If you disconnect the solenoids and cap the lines, the module should detect a problem, shut everything down and turn on the "check suspension" message, thus not turn on the compressor.
Cutting the wire from the module to the message center will keep you from getting the message.