so now theres no more error message on class. My class only works to the rear suspension and only when key is on accessory. when you press the rear button the compressor kicks on and the rear end seems to pump up but when you push the front button there is absolutly no change on the screen. sooo what gives? I have the manual and i see theres a cuple of things i can look at in the system but hey if sumone canm kina pin point it i would greatly appreciate it.