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Best bet for a wiring and parts location diagram is alldatadiy.com. There is a switch attached to the chassis (with a rod connecting it to a rear control arm), on or near the air pump at the rear of the truck.The switch could be faulty, or the rod may be disengaged or damaged. The pump is rather expensive - I would remove it for cleaning (in particular the air filter) and testing first.
theres only two places gm put that pump! under the hood opposite corner from the battery! or lift the car and look at the rear suspension ! ull see it tucked in near the pass side strut!
This may sound stupid but are the correct shocks and struts for air ride on it. I had a guy bring in his caddy with the same problem and the guy he bought it off of didn't want to pay for the expensive shocks and instead went with a cheaper pair without air capabilities. I put the right ones on and problem solved.
My service ride control light was on my display and car was riding really low in the rear. figured my struts were going bad. turned out my fuse was blown for my ELC(electronic leveling control) and car was riding heavy when it blew, so it was stuck riding low in back and it almost fooled me into buying new struts($$$) Figured a fuse couldnt be the problem but checked just in case, and thats what it ended up being so that is the first thing I would check before I spent any money. lets hope your problem is this easy to fix. Good luck.
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