Sam Mazzolino, could be a horn issue as well as a blown fuse, the horn relay or even the horn button itself. First check the fuse. Make sure that it is good. Then apply 12 volts to the horn directly and listen if it works. Some instructions on here If it does, you know you are having a power issue. Check the relay next. For more information about the relay location etc. We'd need to have the exact year of your Corolla.