My 2003 Volkswagon Passaut's horn keeps blowing and won't turn off. How do I disconnect it and where is it located? We had a leak in the windshield and we got 16" of rain this weekend on the east coast.

How much is it raining there?

You have what is likely water infiltrating the Smart Junction Box (SJB). A lot of owners have this issue.

Most likely the windshield seal has failed and leaking on/into the SJB. But can leak elswhere.

Have you noticed dampness inside the cabin... windows fogged over from the inside, floor carpet is damp, or other?

If all dry, then possibly, reseating SJB connector. Otherwise you'll have to find the leak, fix, dry it out.

hi there
The horn is blowing while you turn your steering wheel ,correct?
when you took of the horn button it was still blowing?Do you have an alarm from factory on the car?

ivan
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if you want to disconnect the horn, the easiest way is to locate it under the hood and remove one of the wires connected to it.

Yes you would need to remove the air bag to check the switch contacts. And you would need to disconnect the battery for a few hours before removing the air bag.
I would check with the dealer on the contacts to see if they are separate or part of the air bag.
You could take a test light and check to see if the ground wire from the steering wheel is making the relay power the horn.

Since you Disconnect the motor also renewed the switch and is still blowing the fuse ,it is obvious that you have either broken wire between the switch and the motor. Try to test the failure by means of a tester circuit. Good Luck.

Normally there is a horn relay, try replacing that. The contacts can weld together and keep the horn on. If you take the relay out and leave it out, you won't have a horn but at least it won't be blowing all the time.

You can do this for now so its not driving you crazy, then get it fixed.
If your car horn starts blaring and seems to be "stuck" (it won't stop blowing), you could be in for a few embarrassing moments. There's nothing quite like the stares and expressive hand gestures you can draw as your horn takes on a life of its own. There are a couple of things you can do to get the horn to stop.
If it got stuck when you pressed on the horn switch on the steering wheel, it could be because the switch itself is stuck. Press the horn switch again, or tap it a few times to see if it gets unstuck.
Turn off the engine and look for your fuse box. Look through the circuit descriptions and see if you can find one for the horn. If you can, pull the fuse. This should silence the horn immediately.
If you can't find the fuse box, can't remove the fuse, or the horn doesn't turn off, then you need to resort to more drastic measures. Open the hood of the car and try to locate the horn. If the rear of the horn is visible, you might be able to see the wires that lead to it. Disconnect the wires. If you can't disconnect them, then cut one of the wires. If you cut the wire, wrap the resulting two ends of the wire with tape so that they can't short out your electrical system.
You could disconnect the main wires that run to your battery. You shouldn't cut these but should disconnect them using a wrench. This might "reset" the horn. Hook the wires back up and if the horn doesn't turn back on, you should go directly to an auto repair shop to figure out what is going on. If the horn does turn back on, you'll need to locate and disconnect (or cut) the wires to the horn as previously described. Then, go to the auto repair shop and let them replace the horn for you.

horns only one of to wires takem reroute same route new wires u have a short between the fuse box n the horn befor u put to much money into fuses they can be pricey when u add them all up shop costs n total just re place ur to horn wires

Most common problem is the ground that the horn connects to wit the bolt is rusted and causes it to pull to much amperage so clean the contact first then if it still blows the fuse then the horn relay or the horn may be going bad.over time the horn gets junk in it and causes the coil to overheat and causes it to burn out. Horns cost $15.00 for a new horn and are easy to change. I doubt the relay is bad but it is always possible.

there should be a relay box under the hood you will see the horn relay pull this out