Why does a Mercedes horn sound muffled when water gets inside?

[StRiley]

It is due to circuit damage. The best approach is to open it up and let it air dry, allowing the water inside to evaporate naturally. Otherwise, prolonged exposure may lead to circuit shorting. Here is some relevant information: Solution: If there isn't too much water inside, remove the horn, drain the water, and then reinstall it. Be careful not to lose any parts during reinstallation. Use a hairdryer to heat the horn and evaporate the water inside. Once the water has evaporated, the horn should return to normal. However, if the diaphragm of the horn itself is damaged due to water ingress, the only option is to replace it with a new one. Identifying a water-damaged car: Look for excessive signs of work on seat covers, carpets, door panels, and other interior parts, as well as uncleaned mud in hard-to-reach corners. Circuits and wires that have been soaked in water are prone to issues; the copper wires inside the circuits can rust easily, and the insulation on the wires may age more severely.