horn does not work ?

If it has airbags, it's possible your clockspring is bad. If not, it is likely the horn pad has swollen (seen this before) not allowing you to press far enough to actuate the horn, or that your horn element itself is bad (paper diaphragm inside horn shell tends to go out). You will have to do some electrical diagnosis to figure this one out. Find the horn and attach a test lead to see if you are getting power to the horn unit when the horn pad is pressed.

OK. Thanks. But i can´t even locate / find the horn unit. Where it is ? Inside some fender or where.