DURING NORMAL OPERATION OF A 1999 PONTIAC SUNFIRE, 4DR, 2.2 LITER ENGINE, AUTOMATIC TRANSMISSION. THE WIRING HARNESS AT THE DRIVERS DOOR FRAME, AT THE CONNECTION OF THE UNDERDASH HARNESS AND THE REAR OF VEHICLE HARNESS SHORTED, CAUSING THE INSULATION TO CATCH FIRE. THIS SITUATION SHORTED OTHER CIRCUITS IN THE HARNESS CAUSING BRAKING PROBLEMS WITH THE ANTI-LOCK SYSTEM. VEHICLE WAS ABLE TO BE STOPPED SAFELY, AND THE DRIVER, WITH GOOD SAMARITAN ASSISTANCE WAS ABLE TO EXTINGUISH THE FIRE. FIRE RENDERED THE HOOD LATCH INOPERATIVE. THIS PREVENTED THE DRIVER FROM DISCONNECTING THE BATTERY GROUND CABLE, TO PREVENT FURTHER DAMAGE AND/OR FIRE. *TR