Air ride has worked properly until "check air ride" light came on. The air bags do not leak but any adjustment in load is not compensated for. Compressor clicks on for about 5 seconds only and then clicks off and brings up warning.

Update from Jun 3, 2016: It later turned out that the left rear air bag solenoid shorted internally, and then burned out that circuit in the computer. The solenoid was first diagnosed by reading the diagnostic trouble codes on a scan tool; a code indicated the rear left solenoid circuit had failed. The solenoid was then manually diagnosed by measuring the resistance across it and comparing it to the specification; it read too low. The computer was then diagnosed by first measuring all power and ground circuits and then the solenoid circuits, the left rear circuit was found to not be producing voltage when the key was set to run. A replacement solenoid is available at parts stores, the VDM (Vehicle Dynamic Module) needed to be acquired at a salvage yard (some VDM's have a white connector and some have a grey, this needs to be matched to the old unit).