Cadillac Repair: sts-92 seville, usa cars, metal arm

Question
The compressor to rear suspension does not work.Where in the car i'd find that? It've to be dead, not any sound.the old man from sweden.I'd be pleased to find the problem.The shops here are too expensive to repair USA cars.Thanks.

Answer
The most likely cause is the HEIGHT SENSOR for the suspension.  which is about a 4" black square box with a round electrical harness attached to it and is located on the rear suspension and has a small metal arm that attaches to the sensor and to the vehicles suspension.