I WAS LEAVING THE CAR WASH AND AFTER PUTTING THE GRAND CHEROKEE IN DRIVE WITH MY FOOT ON THE BRAKE IT ACCELERATED ON ITS OWN AND THE BRAKES WERE NOT RESPONSIVE. UNABLE TO STOP OR SLOW DOWN, TO AVOID TRAFFIC, I CRASHED INTO A STONE WALL. THE CAR IS TOTALED AND I HAD SERIOUS INJURY TO MY HEAD AS THE AIRBAG ALSO DID NOT DEPLOY.