I WAS PARKING MY CAR. I HAD THE BRAKE APPLIED AND PUT IT IN PARK. THE CAR ACCELERATED ON ITS OWN OVER A PARKING BARRIER, OVER A 1.5' STONE BARRIER, UP A SMALL GRADE AND INTO AND PARTIALLY THRU A CONCRETE PATIO WALL. THE CAR'S GEARSHIFT WAS IN PARK. I HAD TO MOVE IT BACK TO REVERSE TO GET IT BACK INTO THE PARKING SPACE. AND EVEN THOUGH THE IMPACT WAS SUBSTANTIAL THE AIRBAG DID NOT DEPLOY.