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The other morning the rear of my 2000 Expy was sitting all the way down. I pulled a code, 5830 (C1830) - Air Suspension Compressor Relay Circuit Failure.
Now, I'm thinking it might only be a relay, but I'm not sure where it is, and if anyone else might have had the same issue, and could possibly give some advice.
On my 97 the relay is located under the winshield washer bottle in the right wheel well. To get to the relay, you have to look from under the vehicle in front of the right wheel well. The relay has a 4 prong plug in and it has an aluminum finned cooling radiator attached. It looks like it is held in by one screw.
Hope this helps. I guess there was a big change in Expys in 2002 since most parts dealers show 97 to 2002, and then 2002 on but this part might not have changed.