WHILE ENTERING A DRIVEWAY ON 1/5/2017, MY VEHICLE WAS STRUCK ON THE RIGHT REAR. SPEED WAS 4-5 MPH, WITH NO FRONT COLLISION. HOWEVER, FRONT AIR BAG ACTIVATED AND INSTANTLY CAUGHT FIRE AND DEFLATED CAUSING HEAD TO STRIKE STEERING WHEEL. REAR PASSENGER AIR BAGS DID NOT ACTIVATE ON EITHER SIDE OF VEHICLE. BURN HOLE IN FRONT AIR BAG IS THE SIZE OF A SILVER DOLLAR.