w220 airmatic problem
 

Hi! trying to troubleshoot an issue with airmatic on 2004 model. I bought the car totally lowered and undriveable. During restoration a lot of components were changed or fixed. Suspension were calibrated afterwards and Star diagnosis presents no faults at all. The problem is that suspension goes into limp mode (up and stiff with illuminated buttons of rising vehicle) and does not go in comfortable. I noticed that then Star diagnosis is connected limp mode disappears by itself and comes back as soon as Star disconnects.
Any clues? Something wrong with CAN communication?
Thanks for any advice