This thread is very informative about fuse/relay removal for the Rear Air Suspension (RAS) system:
How To: Convert RAS to Coils
Start at Post # 52 and then there are some good pictures of fuse/relay locations in the following posts.
Basically removing the fuse/relay will stop the on-board compressor from running, and filling up your rear air bags (which cause the rear end to elevate).
I suspect you may have some issues with the height control sensors.