the most easiest place would be a parts store such as autozone or advanced but if you want OEM and dont mind getting dirty you can pick one up from your local junkyard for a few bucks. It is on the passenger side under the front mounted by the radiator.
Th horn is located behind the passenger front bumper, near the fog light.
Change the fuse dummy
Take out the horn relay switch in an emergency. Without the alarm sounding off you can actually start to think...um...
There is no horn relay. The horn is powered by the TIPM (totaly integrated power module). check for power at the horn it self.
If your facing the front of the car, they are mounted on the front, over near the left hand side. It is jambed packed full, so you have to look close----they use a dual horn, so there are 2 of them. I think 1 of them is mounted on the front bumper.
i used my key on the passnger side door to unlock it and my alarm souned off i tryed unpluging the all the computers and battrey and the horn and the lights keep flashing i have no key pad .
drivers side end of the dash, open the drivers door to get to it. There is a pannel. open it and pulld the fuse marked horn / radio amp
i would start by looking down at your hands...in the middle of the steering wheel
it should be just to the right of the passenger side fog light inside the front bumper.
Open the driver side door. Remove the fuse access panel by pulling outward. The horn relay is the bottom most black rectangular box closest to the firewall (front).
The most likely common cause is a failed clockspring in the steering column.
Press the horn button repeatedly while feeling under the dash behind the steering wheel. (This will require some acrobatics.) You're looking for a small metal canister that clicks every time the horn button is pressed.