Hello All,

I have run into an issue with the air suspension, today I plugged her into the JLR SDD software to recalibrate the suspension to standard ride height (I usually run her lowered).

Anyway I messed up the numbers when setting the height at each corner and she calibrated to the maximum height.

I tried using the software, everything to do with suspension - Calibration | Inflate | Deflate | Pre geometry | Transport vs Customer Mode. However, they all seam either to work and then go back or they want to “Self Level” the car but that process seems to want to go up first! However, she can’t as she’s already at the maximum.

Dash telling me Air Suspension Fault and Vehicle to Low despite being at maximum.

I have searched the forum and tried the following. Hard reset touching negative to positive battery connection in hope to make the air suspension module forget what I entered today.

Draining the system of Air by disconnecting lines from the valve block in trunk. Reconnecting and then running all the JLR SDD options I mentioned before but they all go back to the maximum height.

Basically need the Air Suspension module to go back to factory.

Any ideas?

Thanks in advance.

 

Did you connect + and - away from the battery? ie disconnect both from battery
AFIK all the software is in the module behind the back seat.
I suggest that you have a look at that and in particular the connecting pins
for possible bad areas.

 

Hello, thanks for the suggestion. I had left the car over night with the battery completely disconnected and the +/- connection touching.

This morning I bleed all the air out of the system again. Followed you suggestion of looking at the ASM behind the rear seat. Disconnected that and checked the pins all look good. Left it unplugged for a while.

I then reconnected everything and started the engine. The car rose to a fairly normal level I’d say but then I drove it and it’s gone to the max height again.

What is also odd despite the battery being disconnect all night and me reattaching + to the battery and then touching - to + for a few minutes, is when I did start her the air suspension fault and vehicle to low warnings were there instantly.

I have not touched/connected the vehicle to JLR SDD this morning but it still remembers the max height and fault codes.

Not sure where to go next?

 

I would check the height sensors, I have the feeling that at least one is gone. You did not tell us whether SDD has shown any error codes for the suspension.

My car had the problem of rising to full height at the rear only, and in the end it was a height sensor. The relevant error code came uponly after a few tries, not immediately.
When recalicrating the suspension after replacing the faulty sensor, SDD gave me the message that the calibration could not be done due to the air suspension being out of range i.e. still at full height, but I managed to fix that by first draining the whole system via SDD.

Best regards,

Thomas

 

Evening Thomas, thank you for your input.

Funny you should say that, while still working on her for a solution, I have found that the front suspension had popped the bar from the rubber on the sensor. Most likely after going to max height. I glued it back together to no avail. However, I have a spare new set on hand so I then swapped the front out for brand new.

Tried to follow suit with the rear two but both the bolts to the brackets and the screws to the sensor are rusted completely. Cannot remove without surgery but as they had not failed in anyway, I left them for now.

Amongst my trouble shooting of so many things today I had the idea to pop off the part of the sensors that connect to the suspension arm to see if I could trick her and the JLR SDD into not going to max height. Did some math and worked out what the jack point height should be at standard ride height. About 18cm floor to sill roughly front and rear so made some make shift blocks at that height and put them under the jack points. I then drained the system of air. Drained she looked about standard by eye but I was only looking for a temp fix to get her lower so I could then reconnect the sensors arms and use the software to calibrate correctly, hopefully not at max.

Plugged her back into the JLR SDD and early signs were good but in the end at the rear we are good but the front is still rising to max, despite a new sensor (arm disconnected).

Still scratching my head, will be going after it again tomorrow. Found something in the software late today to reprogram the ASM as if new and vehicle on deck. Didn’t work with the arms of the sensors disconnected but I’m thinking now as the software tries to self level it needs to see arm movement to work. Plan is to reconnect the sensor arms and try that.

Hopefully it does but any further input in advance is welcome.

I’ve now developed a coolant leak, either from all the ups and downs or driving at max height to get out of jack mode. Nightmare, one problem at a time though will sort the coolant leak after the suspension issue.

 

Resolved.

Today I reconnected the sensor to standard positions, let the air out and only fired the car up using the programming of new ASM in the JLR SDD. Followed all the instruction and was all good in the end.

Note: Finding programming new ASM is not the easiest to find. Follow the following path.

Diagnostics > Select Symptoms > Chassis > Suspension > Vehicle Dynamic Suspension > Height > Select both: Vehicle to Low & Will Not Rise > Continue. After loading go to Extras and you will see program new ASM and follow instructions from there.

Thanks for the support and hope this helps anyone else with same problem.

 

Good to hear that you could solve the issue!

Best regards,

Thomas

 

Well done