VEHICLE HAD BEEN SITTING PARKED FOR SEVERAL WEEKS, LOW BATTERY 9.8 VOLTS. SPONTANEOUSLY HEADLIGHTS CAME ON SMOKE FILLED CAR, DOORS WOULD NOT UNLOCK MANUALLY OR BY REMOTE. SHATTERED DOOR GLASS WITH FIRE EXTINGUISHER . CLOSE INSPECTION APPEARS FAULTY HEADLIGHT SWITCH STARTED FIRE HAD 8 TO 10" FLAMES COMING OUT OF LEFT DASHBOARD. DAMAGE TO HDLT SWITCH,VENTS,DASH,CLUSTER,A PILLAR COVER. PUT OUT FIRE MYSELF SO NO FIRE DEPT. REPORTS.