How to Replace the Horn on a Mercedes-Benz?
2 Answers
Open the engine hood and use a T25 to remove the four Torx screws on the front grille. Insert both hands into the two elongated holes at the lowest point on either side of the emblem, wiggle and pull outward. The first removal might be tight, requiring some force to detach it. Then start the vehicle, turn the steering wheel fully to the left to facilitate the removal of the T25 Torx screws inside the fender liner. There are four T25 screws on the vertical surface. After removing the left and right bumper corners, move to the front of the car to locate the gaps on either side of the front bumper. Hook your fingers and pull towards your body. At this point, the front bumper will lower, allowing you to remove the headlight. After removing the headlight, detach the fixing screws on the rear side. The screws can be removed using either a T30 or a 10mm T-socket, with the 10mm T-socket being more convenient. You can then proceed to replace the horn.
Last time I replaced the horn on my Mercedes myself, it wasn't too difficult but required attention to detail. First, you'll need a 10mm socket wrench and a Phillips screwdriver. The most crucial step is disconnecting the negative battery terminal—safety first! Mercedes horns are usually hidden behind the front bumper or inside the grille, so you'll need to remove the front wheel arch liner or grille cover first. When locating the factory horn position, remember the wire color coding sequence for the connector, and don't force the connector off to avoid damaging the clips. When installing the new horn, ensure the sealing ring is tightly compressed to prevent water ingress. Don't rush to reassemble the bumper—reconnect the battery first to test the sound. Finally, reinstall all removed components. The whole process takes about 40 minutes—just keep your hands steady.
