Hi

My x5 2011 rear n/s air suspension hight lift sensor light is on all the time, it's 40 mil down ,I've changed the high lift sensor but it is still lit up on the dash and it's still 40 mil down

I've not heard the compressor come on , the other side is ok ,

Can anyone advise me please

John

Morning John

Welcome to the Forum

My first thoughts are leak in the air spring or a blown fuse check them all. When you say you changed the high lift sensor I assume (dangerous) that was the rear ride height sensor ?

If there is an air leak the compressor will run a lot and can be damaged, replacement is not a bad job and compressors are not bank busters (check the internet). I have seen several where faults were caused by faulty wiring at the Ride height sensor plug check carefully. It could be a Suspension Control unit (rare but not impossible) easy change plug and play

Hope this helps

Dave

Cheers Dave I'll try them

Hi John

The Suspension Control Unit should be programmed with the correct ride height so once the fault is cleared things should return to normal Fuses are in the Front Fuse Panel No 32 Relay is R2 in the rear Fuse Panel No 107

Correct ride height should be 720mm +/- 5mm measured from the bottom of the wheel rim to the wheel arch lip through the wheel centre

Dave

I took the car to a man with a computer for bmw vehicles and the car is not communicating with his computer in the rear air suspension set up, all fuses and relays are ok

Any ideas anyone

Rgds

John

Morning John

It depends what Diagnostic he was using there are several systems that can communicate with the car but mainly the key control units. Foxwell, Autologic, iCarsoft there is quite a long list then there is BMW ISTA/INPA which can see every component, it includes Workshop Information (WIS) which gives Photos and descriptions of how to do the job plus advice on test programs to confirm diagnostics. I use ISTA at home

The air suspension system isn't complicated it has 2 Air Springs 2 Ride Height sensors 2 Fuses a Relay a Control Unit (Programable) and the Compressor.

As your issue started with the Rear Ride Height sensor I would begin there with the Plug Connector and wiring make sure there is no damage to the wiring. You will need a Wiring Diagram (ISTA) each plug has 3 wires that feed back to the Control Unit (the Control Unit is in the Rear Right Cubby at the bottom of the Fuse board) BMW rear air springs are used on several models not just X5's I have seen several where the wiring had become cracked and brittle with broken connections. That is where I would start, if continuity is there then in my experience Control Unit failure is rare but not impossible a replacement from a Dismantler would be a starting point and not to £££ they are plug and play. With ISTA they can be checked and recalibrated if needed.

Dave

It turned out to be some bad connections in the wiring and it now works as it should, thank you to all for taking the time to help

Rgds

John