Memories of my 89 Continental with that air suspension light alway popping on, went through all the wiring, major problem was in the ignition switch that also solved a problem with the volume control on the radio that wouldn't work. These microcontroller devices require a power on reset to work properly that requires a very sharp rise time voltage from the ignition switch, but instead of that, you get a series of glitches.
Ford dealer told me the average repair bill on these things was 3,000 bucks, the ride was a tad softer, but could be emulated by reducing the air pressure in your tires. Ha, replacing worn tires is a lot cheaper than those air shocks. Made a note to look under the car since then to make sure it had real springs. A year later, two or the air shocks developed leaks, can't do a darn thing with those except replace them at 750 bucks a piece. But later found some rebuilt ones for 250 bucks a piece, but don't know how good they are, just got rid of it.