need help!!!!

my dam alarm won't stop goin off on my 02 9-5. It started awhile ago and I took it in but the dealership wanted way to much to fix it. They said the battery is going out in the horn. The problem stopped after that then today it has been goin off about every 5 mins. Can someone tell me how to disable the horn temporarily till i can get it into the dealership. Thanks any help is much appreciated.

take te horn out and resolder 2 3V batteries to it.  That usually works.