driver door light switch connected to air??

Sounds like one of the lines going to the instrument cluster or over to the dash valves. Probably a loose push-lock connector or something. Pull the dash trims and see if you can locate it. If you're lucky, you may only need to trim the end of the line and plug it back into the connector.

 

Not really, that's pretty odd. The only thing I can think of is that the rod on the button is traveling into the cavity where a wire-bundle might be snugged up with one of the air lines, and it's articulating as the button is pushing on wires, maybe? I can't think of any air valves in the dash that are electronically actuated- you know, where a short or something might cause a valve to open and close.

The low air warning unit is static (I think), as are the dash valves.

 

If it's leaking fast enough you could leave the door open for awhile and see if if will kick the dash valves out and activate the low air warning unit. If it does, and both of those devices are operational, yet the leak persists, maybe pull the trims and see if you can get a handle on it that way.

 

There is absolutely no connection between the two century does not even have any air going to the doors or even close to them for that matter