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Now: 2008 STS-V, 1960 Eldorado Brougham Then: 2002 Escalade
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Discussion Starter #1
I noticed that my rear air suspension isn't leveling itself anymore. I checked all the fuses and none were blown. Does anyone know which specific fuse controls the compressor? Anythings I can check without having to bring it to the dealership? When I had the truck inspected a few weeks ago the ALDL connector didn't have power and they replaced a fuse and then it worked. Could this be related? Any help is appreciated.
 

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2012 Escalade, 2014 SRX
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Steve, you have to make sure you are getting power to the compressor, and the compressor is working, you can, or someone can check that by applying power to the compressor to see if it runs.
 

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Thats correct. By the way the ALDL is on the strangest circuit... the reason it goes dark occasionally is because its on the same circuit as the cigarette lighter socket. A very helpful member showed me that here recently.

Whats strange in your situation is that the truck isnt leveling but youre not getting the "SERVICE RIDE CONTROL" message, or are you?
 

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Discussion Starter #7
Thats correct. By the way the ALDL is on the strangest circuit... the reason it goes dark occasionally is because its on the same circuit as the cigarette lighter socket. A very helpful member showed me that here recently.

Whats strange in your situation is that the truck isnt leveling but youre not getting the "SERVICE RIDE CONTROL" message, or are you?
Not getting the Service Ride Control message at all. I just know the car isnt leveling itself. Me and my dad stood on my hitch step for 5 minutes yesterday and the compressor didn't kick on. When it was working it would come on after about 45 seconds if I stood on the step.
 

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Discussion Starter #9
Just out of curiousity, does it ride any different or sit too low when the leveling system isnt working?
I can feel that the rear is lower than it normally is. It's sitting about 3/4 of an inch lower than it normally does. It's almost riding like a fully loaded pickup truck would, which its never done before because its always leveled itself out. I really need to crawl under there and take a look.
 

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Youve got a few miles so your pump may have gone kaput, but I have a feeling theres an electrical connection that worked itself loose somehow. The fact that the "service ride control" message is absent is really really strange however.
 

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Discussion Starter #11
Youve got a few miles so your pump may have gone kaput, but I have a feeling theres an electrical connection that worked itself loose somehow. The fact that the "service ride control" message is absent is really really strange however.
I'm hoping it's a loose connection myself. I'd like to avoid any major repair bills if I can help it. I've got 90k on it now, I'd like to see it through to 100k before I think about replacing it.
 

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If I get a chance Ill disconnect the pump on mine tonight or tomorrow and see if that causes the message to come up, then Ill try pulling the fuse. If Im able to make it warn me with both of those then it may well be the pump is just worn out, but functions electrically enough for the computer to "know its there" and think its working.
 

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Discussion Starter #13
Thanks. If you figure out what fuse it is, let me know. I just checked them all (or I think all of them) one by one. Nothing in the manual jumped out at me as being for the compressor.
 

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Fuse is STUD#1 underhood elect center - 40A maxi fuse.
ESC module does not monitor this part of the circuit so you'd have no message. Your compressor is probably shorting out when it gets heated up and then blows the fuse. Replace the compressor and fuse.
 

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Discussion Starter #15
Fuse is STUD#1 underhood elect center - 40A maxi fuse.
ESC module does not monitor this part of the circuit so you'd have no message. Your compressor is probably shorting out when it gets heated up and then blows the fuse. Replace the compressor and fuse.
Thanks, I'll check that when I get home. Any idea on how long the FSM says a compressor replacement should take?
 

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Discussion Starter #16
I crawled under the truck, the compressor is shot. I pulled the plug going to it and it's getting power. The fuse isn't blown. It looks like it's a PITA to replace on the ground, I'll probably take it to the dealership.
 

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Steve, you have to make sure you are getting power to the compressor, and the compressor is working, you can, or someone can check that by applying power to the compressor to see if it runs.
i agree with him double check it!!!!!
it could be a simple problem
 

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If you're sure the compressor is not running and the fuse is good, and you have power at the connector, I see no other option.
Compressor is behind the LR wheel. Disconnect the air line, filter line, and connector (not necessarily in that order). Three nuts at the inboard side of the frame hold this on (through holes in the frame) - 13mm socket. Thirty minutes time in your garage/driveway.
 

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Steve I dont think these are real expensive on Ebay in case for whatever reason you get a hard time with the warranty. You shouldnt have any problem though.
 

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Discussion Starter #20
Steve I dont think these are real expensive on Ebay in case for whatever reason you get a hard time with the warranty. You shouldnt have any problem though.
My warranty is gone and expired. This is all out of pocket. The mechanics in my area charge comparable per hour rates that my dealership does, might as well get it done by someone who knows these trucks...
 
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