Diagnostics would be first port of call to find out why the ECU has halted the system.
 
As Saint says. It could be anything from the ABS unit sulking or the Ride Height sensor kaputt. either way get the fault codes read. It's not likely to be fatal or serious and u should be able to fix easily.
 
Hi Dolphinboy new to the boards hope you can help me out, i have the problem you have talked about above no4 water in spare wheel well, my suspension just stoped, its stuck in high mode.
no ride hight lights showing up and down and air suspension inactive on dash. i think its shorted out. could you help me solve this problem? many thanks
have you fixed the issue and stropped the water getting in first ?

usually its the tailgate seal that needs replacing
 

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