TL*THE CONTACT OWNS A 2000 MERCEDES BENZ SLK230. WHILE DRIVING 25 MPH, THE CONTACT HEARD AN EXPLOSION NEAR THE DRIVER SIDE DOOR, FOLLOWED BY A BURNING SMELL. THE CONTACT PULLED THE VEHICLE OVER AND NOTICED THAT THE DRIVER SIDE DOOR AIR BAG DEPLOYED, WHICH BRUISED HER LEFT ARM FROM THE ELBOW TO THE SHOULDER. NHTSA CAMPAIGN ID NUMBER 01I005000 (AIR BAGS:SIDE/WINDOW) WAS REFERENCED. THE CONTACT DID NOT NOTICE ANY DIFFERENCES IN THE VEHICLE PRIOR TO THE FAILURE. THE VEHICLE HAS NOT BEEN DIAGNOSED BY THE DEALER. THE VIN WAS UNKNOWN. THE CURRENT AND FAILURE MILEAGES WERE 45,000.