You horn is shorting by rust deposit.
If you really want to see witch one is defect, unplug them one by one and do a road test. The vibrations of the road loose the rust deposit and let them in contact with the horn circuit directly.Remember that you have 2 horns (bettwen the bumber and the radiator)
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This is a tough one, if a horn itself was shorted, it wouldn't sound.Try unhooking both horns, and try to activate it from the steering wheel. If the brake light´s fuse still burns, at least you know that there is a short in the cabling leading to the horns. If the fuse doesn't trip, then one of the horns should be the culprit.
If your fuse is not blown, then you'll want to test the horn voltage with a test light at the horn while the horn switch is being pressed.
I would suggest unplugging the horn & just testing the wire for 12V + and if you have voltage there but the horn won't work when reconnected you'll have to replace the horn.
If the voltage is missing at the horn connection when you do the test, then it has to be either the fuse or the relay, and finally, the switch on the steering wheel. Wiring is a last consideration based upon the circumstance.
The owners manual will have the fuse & relay location.
It of course would be a coincidence for it to be anything but the horn & I do expect that the horn is bad or has a bad connection which you'll correct when you reconnect it after testing! good luck
Check your ground connections. If you're burning out bulbs all the time, it's usualy due to a bad ground. Remove the rear fender plasic inside panels and follow the bulb harness to the ground connection. Check for corrosion, if found, clean and use dielectric grease of the ground connection.
You may have a bad ground on that side. Look at all the wiring back there and see if there is any corrosion. Some times you can find the ground wire and run a new ground. Unlike the power lead, you can add a ground anywhere in the system with no impact on the integrity.
well with the fuse to what ever that it goes to. it sounds like you have a short someplace in the wiring. if you know what the fuse is for i would check the wires and make sure none of them are bad, or crossed, the fuse is to protect against to much power to that device that it is for and if you have to much going to it than the fuse will blow, and as far as the horn goes i would check your wiring from the horn plug back to the power supply.
Sounds like wiring. The key won't release unless the car is in park. From what I can remember the solenoid that controls the shifter lock is on the same circuit as the horn. Since the fuse was spent I think somthing must be shorting out. Take the centre console out and check for burn and or touching wires by the shifter.