WAS TRAVELING APPROXIMATELY 15MPH & RAN RED LIGHT. HIT ANOTHER VEHICLE ON RIGHT SIDE. CHECKED OTHER VEHICLE & RETURNED. STARTED TO MOVE F150 & WAS TURNING STEERING WHEEL. AIR BAG POPPED (PUFFED) OUT, ON FIRE, & FELL INTO DRIVER'S LAP. DID NOT EXPLODED LIKE IT WAS SUPPOSE TO DO. MJS