Theory Of Operation
WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
The Air Suspension Control Module (ASCM) detects that it cannot vent any air from within the system to the outside atmosphere. In order to vent air it must be go through the reversing valves, the compressor, ambience valve, and finally through the exhaust hose.