i own a 97 nissan altima with a alarm installed right after i purchased the car, the security system worked fine till yesterday when i pressed unlock button, an did not hear any sound, so i sat in the car and waited a few miniutes then open the door again, the siren does not come on,(usually the siren would come on when ignition is locked and car will notstart up), i tried to disable then eabled the alarm again, still no soren,( no sound) can any one please help me with this issue?