Well came out to the rear of my xj slammed on the ground , checked everything I could check & nothing not even a code . .... any idea why ?

 

Someone stole your wheels.

 

The rear is air sprung so it has to be that, I would think. How long was the car standing ?. Have you started the car at all ?

 

Yup, one or both of your rear air springs is leaking.

 

Yes I’m aware it’s air sprung , but it has never sat on the ground like that , it’s always sat up in the rear no leak sounds . But the compressor isn’t even trying it doesn’t kick on no matter what I do , so I’m thinking it’s the compressor or the level sensors .just have no clue ... about to get it towed to the dealer , I’ll let you guys know what they find assuming it’s a proper diagnostic.

 

Unclereggie, before you pay for the tow, I would say to check 2 things. The first will be fuse F22 in the rear fuse box. This is the power to the compressor. Check to see that you didn't somehow get that to fail. After that, check relay R10 in the rear fuse box. This is the relay that powers on the compressor. If you don't have a spare relay, then what you can do is set some solid strand wire (say 18 gauge) and strip back about a 1/2" on each end and then bend it into a U. If you look on the relay. The terminals should be labeled 30, 85 thru 87, and 87A. You want to install a jumper between 30 and 87. If the compressor kicks on, you either have a bad relay or the control signal from the suspension module is not active.

if you need something more to check, let me know. i will look a bit more and see what I can find for you.

 

My car tries to re-level when I jack it up. You may try that first.

 

Okay so far the dealer has figured out its a little black control module , but the tech is wanting to make sure it’s nothing else before sending it back