Air suspension compressor

In which way? Does it not turn on? Turns on but creates no air pressure? If it does nothing check that the suspension switch in the trunk on the passenger side, if it was turned off or failed the air ride shuts down.
Next test the system fuses, fuses 17 and 18 in the block in the dash, and the 30 amp pump fuse in the under-hood fuse box.
Pull the 30 amp and check that the contacts hold the fuse tight. They can loosen up from the heat generated by the pump drawing current.
Next test the pump relay located in the same box as the fuse.

Now find the pump harness where it comes out from under the air box, You should find a black wire which is ground, and either a red wire or a light blue with pink trace, it depends on which side of the connector you are on. If you hook the black lead to battery negative, and the other to battery positive the pump should turn on and pump up. If it does not the vent solenoid located on it has probably stuck partly open. Both are under the air-box in an area that gets water and crud a lot.

If all of this does not do anything you will need to look at the fill solenoids on the springs and see if they are getting power.