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Air suspension not working, sporadic errors.

@Gtech - do you know if the relay is what powers the compressor, or does the compressor get its on/off signals from the ECM? Wondering if perhaps at some point the relay got stuck closed and maybe that is what started this whole mess (with the eventual destruction of the compressor).

SAS module controls the relay and the relay is powering the air suspension compressor:

1663013339702.png


About the relay you could be right, if you open the relay you can check the contacts, some shops only sell air compressors+relay for this particular reason
 
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Hey @Doanster1 I wouldn't turn down a spare relay for testing! I'll PM you. Paypal ok for cost and shipping?

BTW this is the forum when it is at its absolute best! I started this with only the basic understanding I brought from my various Jags/Land Rovers and with all your help, I feel like I am coming up to speed. @Gtech - that wiring diagram was absolutely the missing link for me to understand the flow!

The software of course is a black box to me, but that's not an area of talent for me (despite 25+ years in IT...)

One thing I have noticed, is some of the models have 2 or 3 (or 4?) fuseboxes, whereas I just have the one long one - so my fuse and relay #'s are a bit different - in my case K112 and F154 - but the specs and the logic is the same! Wish they could keep things like fuse numbers the same from year to year...
 
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So I am at the service center now and had a good thorough chat with the tech, so I think we have an understanding this time. The car made the 60+ mile drive without issue with the manual airing up I did, but I did disable the automatic lowering at speed so as not to tempt fate. :-D

Now let's see if they can also finally get my USB port to work and re-enable my Slacker.... but those are secondary at this point!!
 
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Yeah, fingers crossed. I made it pretty clear that I favor a methodical approach. At the moment my hypothesis is that if the valve block were leaking, it would not have held after I pumped it up. I'm happy to be proven wrong with data.

Must be my lucky day - I actually even got a loaner car today!! identical blue 2015 p85d, but hey!
 
OK - done and dusted. They confirmed that the original compressor not only had seized but was the source of the leak in the first place (as suspected). They checked all 4 struts, the hoses, and connections to and from everything, the valve block, etc and declared it all sound. They also tested it pretty thoroughly to make sure it wasn't going to sag after a few hours etc. I'm (cautiously) satisfied, and they knocked it out of the park on this one. Hour ride home and no error lights!
 
OK - done and dusted. They confirmed that the original compressor not only had seized but was the source of the leak in the first place (as suspected). They checked all 4 struts, the hoses, and connections to and from everything, the valve block, etc and declared it all sound. They also tested it pretty thoroughly to make sure it wasn't going to sag after a few hours etc. I'm (cautiously) satisfied, and they knocked it out of the park on this one. Hour ride home and no error lights!
Glad your sorted— only just seen this post. Having recently “ been rooked” by Tesla for a suspension fault ( out of warranty ). It was a faulty frh airbag but the compressor had got very noisy, and to be fair to them they recommended a new one. I had the parts returned ( long story) but the interesting part was that strip down on the compressor, the motor was wringing wet I don’t know how it had kept going. ( hadn’t been thro’ a flood). This had washed out the grease in the big end and was on the verge of collapse. Anyway put a new bearing in and it’s OK ( but not pressure tested) cost approx £4 now I have a spare. Also played with the suspension unit another story. Regards for Olde England
 
2017 X 90D just came up with the same problem. This post has been extremely helpful!
Wanted to add that you can get a 40A fuse replacement from autozone for $5.
Sometimes the fuse will look slightly different with two "40"s written on it but it should work regardless.
 

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