I see this is an ancient thread but I figured Id resurrect it.
I just encountered the same problem. I noticed that at the same time my auto leveling quit working so did my rear power windows.
Has anyone else had this problem, fuses are all good. The air pump turns on with the button in the back hatch but doesn't raise the vehicle, its like there is a diverter valve not working somewhere. The pump wont come on by itself to level the vehicle. Also the rear power windows quit functioning.
Any suggestions?