DRIVER/OWNER TRAVELLED INTO A PARKING LOT, PARKED WITHOUT INCIDENT AND TURNED THE IGNITION COMPLETELY OFF. WITHIN SECONDS, THE DRIVER STEPPED OUT OF THE VEHICLE, THEN LEANED OVER TO RETRIEVE THE KEY WHICH WAS STILL IN THE IGNITION. AS THE DRIVER REMOVED KEY FROM IGNITION, WITHOUT WARNING, THE DRIVER'S SIDE AIRBAG DEPLOYED, STRIKING HIM IN THE LEFT CHEEK. THE DRIVER SUSTAINED FACIAL BURNS. PARAMEDICS AND FIRE RESPONDED. LATER, HE WAS TAKEN TO AN EMERGENCY ROOM. PRIOR TO THIS INCIDENT, THE VEHICLE OPERATED PROPERLY AND RECEIVED ROUTINE MAINTENANCE WITH DEALER.