i was told that a buzzer or an alarm was installed on 85 lesabres that were activated by the door, healdight switch and the sealtbelts. i hear no buzzin on my car when the respective actions occur. if i do have this and its blown, where can i find it and where can i find a new one?

The relay is probably located behind the glove box. I would buy one new from a store such as Autozone, Advanced Auto Parts, Ect.