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These problems are difficult to find, but not impossible. The wiring harness will have to checked at the following points. Check the fuse unit. (Clean all connections on the fuses and contact points.) Trace the connections from the horn to the firewall. If that is fine, check the connections from the wiper to the firewall. Inspect the wire harness loom that goes through the firewall towards the steering wheel. Inspect the "kickdown" switch underneath the accelerator. Test the switch for continuity. If the problem is still unresolved, check the relay panel and all relays for corrosion on any connectors. Be sure to inspect all earthing points on the body.(brown wire). This will take you a couple of hours to work through. Always tidy the wires after inspection and use proper solvents when cleaning contact points. I had a similar issue with my W124, when turning on the lights, the wiper started to work. I found the problem caused by a short on the headlight unit when I was working on the car. Good luck, I hope you find the problem soon.
In many cases, a blown fuse is the reason a horn does not work. Locate your fuse box. The specific location can be found inside your owner's manual. Inside of the fuse panel, you will find a diagram of the fuses. One of the fuses will say Horn. I recommend changing the fuse. If you do not know a lot about changing fuses, a auto parts store should be able to help you out. Hope this helps!
It is located behind and below the passenger side headlight. It can be
changed yourself, but being an auto technician, I can tell you it's not
the easiest to change, it is most accessible from under the car. Remove
the lower front splash shield from the right side wheelhouse for
access. 13mm socket for the bolt and unplug the wiring harness. If you
get a universal horn, you will have to cut the wiring harness to splice
in the horn.
So if the question is how to fix you must remove the steering wheel and clean or replace the contact ring normally. Wont really know till you get it apart.
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