Sooo, the people who designed the wiring harness for Compass are morons. I guess they forgot that places who get snow eventually have water build up on the floor..and the carpet get's damp. Long story short, the 4x4 wiring is under the plastic trim that runs along the door sill. Jeep has fabric tape on 4 separate wire connections. Fabric absorbs moisture. After removing the tape, the connections were corroded green. I replaced the bad wiring with new and sealed it with 3m electrical tape. Problem fixed - 4x4 works again.I can't understand why the harness isn"t water resistant on joins. You would think they would have this figured out by now!!!
That's my 2 cents.