My 99 Park Ave with recently new air shocks has been working great until a few days ago after returning from a trip where I carried a heavier than usual load. Now the air shocks appear to inflate to more than leveling pressure (rear of vehicle sits up really high and doesn't deflate down to normal height). My understanding is that the leveling sensor causes the compressor to pump up until "normal level" is reached then shuts down. Repeats as required when rear drops for any reason EXAMPLE: when adding enough weight to push the rear downward. Next step is when the rear is relieved of load and allows the rear to rise - this causes the sensor to determine that the rear is sitting too high and sends a signal to the compressor to release some air back from the shocks through and out of the compressor head. NOTE: ALL OF THIS IS LEARNED FROM READING THIS FORUM FOR THE LAST 24 HOURS. I'm hoping I understand it correctly.
NOW FOR MY QUESTION: reading some posts has shown different wire colors to/from the compressor. Possibly a different vehicle. What are the colors for my 1999 Park Ave? How many wires and what are their designation to/from the sensor and the compressor? Is there a simple test to check the wiring from the sensor to the compressor? Does anyone have a schematic of this circuit that could be attached to a reply?
Thanks to all that share their knowledge on this forum. This is great.
Virginia Newbie - Eddie

First thing I'd check is the sensor. Look in the driver'* side rear wheel well. You should see a device with an arm at the front of the wheel well. That'* the sensor. Inspect it to make sure it'* not somehow stuck in position.

the esiest test to me would be take that arm loose and if you push it up the compressor should come on, pull it down and the air should come out, be patient it take a while sometimes