My Edge Limited was 4 years (42,000 miles) old when this happened. For a short time slamming the door worked and also spraying the lock to free the switch worked. I looked into the changing the lock but at $500+ dealer repair, I put it off for a month or so. The major problem with the Door Ajar light on, was you could not lock all the doors unless you pushed each manual lock button down. I filed a complaint with the National Traffic Safety Board, since without the auto lock you were subject to a Car Jacking!! I have heard nothing from them or any recall. I did find that if you roll down the window and stick you hand out with the key fob and press lock, it will lock the all the doors! It will not do the same inside the car by design, so you don't lock yourself out. I finally gave up and paid $430 to change out the lock-set with switch at a trusted local repair shop. I kept the part for analysis.
