The way in which of disconnecting a car alarm system can vary per model. It's a good idea to read your owner's manual first. They usually have some helpful hints. Here is a site for disarming an alarm on a Buick (GM): http://wiki.answers.com/Q/How_to_disconnect_car_alarm. The following site: http://www.ehow.com/how_112650_shut-car-alarm.html, offers information for disconnecting an alarm that
. won't shut up! These websites hopefully will stop that ringing in your ears.