I HAVE A 2014 JEEP PATRIOT (HIGH ALTITUDE ). I WAS IN MY DRIVEWAY AND PUT MY SUV IN REVERSE AND STARTED TO BACK OUT. I ONLY MADE IT ABOUT 3 FEET. SUDDENLY I HEARD A LOAD BANG AND FELT A BLOW(HIT) TO MY HEAD AND NECK. IT WAS REALLY FAST AND HARD. IT HIT SO HARD THAT I THOUGHT I WAS IN A WRECK OR SOMETHING . MY SON WAS FREAKED OUT AT THE NOISE AND THOUGHT SOMETHING HIT US TOO. AFTER LOOKING OUTSIDE OF THE CAR AND FINDING NOTHING, I NOTICED THE HEADREST WAS MESSED UP. APPARENTLY THE ACTIVE HEAD RESTRAINT DEPLOYED. I DID SOME SEARCHES ONLINE AND THIS IS NOT NORMAL AT ALL. ESPECIALLY WHILE YOUR CAR IS IN REVERSE. THIS ALSO ONLY HAPPENED ON THE DRIVER SEAT ONLY.