This is normally an easy fix. Grab yourself a small screwdriver and take off the back of the SAFC-II. You will see where the wiring harness plugs into the unit. Normally from all of the vibration the harness will work itself loose. If that isn't the problem, take a look under the dash to make sure that the other end of the harness didn't come loose (I haven't seen this happen yet, but you never know

).
Let us know if that worked.
