IGNITION/ANTI-THEFT SECURITY SYSTEM FAILS. CAR WON'T START. "SECURITY" LIGHT FLASHES RED WHEN I TRY TO TURN THE KEY. MUST WAIT ABOUT 10 MINUTES FOR LIGHT TO GO OFF. ALSO, SECURITY LIGHT COMES ON AS I AM DRIVING AND REMAINS THAT WAY UNTIL I TURN THE CAR OFF. ON ONE OCCASION, CAR STALLED WHILE DRIVING WITH LIGHT ON. THIS PROBLEM BEGAN LAST YEAR. I TOOK THE CAR TO A GM DEALER AND HAD THE ANTI-THEFT AND IGNITION SYSTEM REPLACED. IT COST MORE THAN $500.00. TODAY, EXACTLY ONE YEAR AFTER, THE PROBLEM STARTED AGAIN. SAME EVERYTHING ALL OVER AGAIN. *JB