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Short in the wiring, horn switch defective, or horn relay going bad.
horn location Mercedes Benz 2001 ml 320
first remove wire to horn. see if power is going to horn when horn button is pushed. if it does its a horn problem, if not it is probably in the horn button itself.
Just for kicks check the voltage going to the horn, but I am prett sure you'll just need to replace the horn itself.
The horn fuse, for your Mercedes ML 320, can be found in the fuse box in the engine compartment. A diagram of the fuses will be on the inside of the fuse box cover.
in my balls
Peugeot horns can go off without the driver's intent. Normally this happens when the driver has huge knockers which accidentally push the horn.
Diagnose to determine the specific problem and go from there. Check your fuses and relays, check to see if power's getting to the horn, ensure that the ground hasn't been compromised... if all of those check out, then the horn itself probably needs to be replaced. If you don't have power going to the horn, check the horn switch itself for continuity and to make sure it's getting power to it.
check the horn relay or the horn itself!
To replace the ignition switch on a 1982 Mercedes 300SD, disconnect the battery and remove the horn pad. Locate the wire behind the horn and remove.
could be either. or a fuse.
Start by figuring out what's wrong with it. That's always the key. Always. Either the fault is in the power supply, the horn switch, or the horn itself. What I would do is start by checking fuses and relays. If those checked out, I'd move to the horn itself (if it's readily accessible... I might save it for later if it isn't) and see if power is getting to the horn. If it is, I'd supply power and ground to the horn and see if it works.. if it did, then I'd know I had a faulty ground wire. If it didn't, I'd replace the horn. If that's not it, then I'd move to the horn switch itself... remove it from the steering wheel, check it for continuity. If it didn't have continuity, I'd replace the horn switch. If it did, I'd see if I had power going to it. If I didn't, then I'd know I had a wiring fault between the fuse panel and the horn switch. If I did, the most likely explanation would be a wiring fault between the horn switch and the horn itself. Or actually, between the relay and the horn itself, since I've already ruled out the relay.