THE RADIO SPEAKERS GIVE OFF A SIREN SOUND FOR ABOUT 10 MINS. DURING THIS TIME YOU CAN TURN OFF THE ENGINE BUT THE RADIO FUNCTIONS DO NOT OPPERATE ie IT WILL NOT TURN OFF.THIS HAS HAPPENED TWICE IN TWO MONTHS. THE DEALER HAS LOOKED AND FOUND NO FAULT BUT DISCONNECT THE BATTERY TO RESET THE SYSTEM. HAS ANY ONE ELSE ENCOUNTERED THIS PROBLEM.IT HAS SOUNDED AGAIN SINCE THE SYSTEM RESET ;)