95viper

I got a airmatic malfunction message on dash (not check engine light). Front suspension good but rear is high. Could be the pressure relief valve at compressor not releasing. I guess could be the rear level sensor. When I open the door the system does not try to level like usual. Pump doesn’t run or release air. The buttons below shifter to raise or sport settings are inoperable.

Is there a scanner that can read what’s wrong or is it only Star that can do it?