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Pelican Technical Article:

Horn Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$90 to $180

Talent:

**

Tools:

10mm socket, flathead screwdriver, floor jack, jack stands, wheel chocks, safety glasses

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Horns

Hot Tip:

Make sure you order the right one

Performance Gain:

Working horns

Complementary Modification:

Polish the headlight lenses

There are two different horns on the Mercedes W204, one on the right side and one on the left side. The horns are different frequencies and are designed to point downward towards the pavement so make sure you confirm the right horn before ordering.

You will be working around one of the decelerometers for the air bag system: the air bag connections usually have yellow plugs. As long as you do not unplug the sensor by accident everything will be fine, and you will not have any error codes.

The two horns on the Mercedes w204 are located just behind the bumper cover and below the actual bumper (red arrows).
Figure 1

The two horns on the Mercedes w204 are located just behind the bumper cover and below the actual bumper (red arrows).  

While you can undo the four push/pull pins on the fender liner and bend it back out of the way, you are going to be working in a crowded area.
Figure 2

While you can undo the four push/pull pins on the fender liner and bend it back out of the way, you are going to be working in a crowded area. I recommend removing the front section of the wheel well liners. Please see our article on wheel well liner removal for step by step instructions.

This photo illustrates the location of both horns with the bumper guard removed (red arrows).
Figure 3

This photo illustrates the location of both horns with the bumper guard removed (red arrows). On some newer models you will end up having to remove the bumper cover.

On the left side drain the windshield washer reservoir.
Figure 4

On the left side drain the windshield washer reservoir. Loosen it and move it off to the side with the lines still attached (red arrow). Please see our article on the windshield washer reservoir for additional instructions.

This photo illustrates the horn and where it mounts behind the bumper (red arrow).
Figure 5

This photo illustrates the horn and where it mounts behind the bumper (red arrow).

One of the decelerometers for the airbag system is located on the back of the bumper just above the horn.
Figure 6

One of the decelerometers for the airbag system is located on the back of the bumper just above the horn. It should have a yellow connector on it. Do NOT touch this sensor or connection. If you just leave it alone everything will be fine and you will not have any airbag error codes or lights.

Use a small flathead screwdriver and release the clip on the wiring connection.
Figure 7

Use a small flathead screwdriver and release the clip on the wiring connection. Squeeze the clip and pull it straight back and off (red arrow). Next use a 10mm socket and remove the single bolt that attaches the horn and arm to the back of the bumper (yellow arrow).

Installation is the reverse of removal.
Figure 8

Installation is the reverse of removal. The horns are designed to only fit one side with the open trumpet of the horn facing the ground. If you somehow manage to install them wrong the trumpet will be facing upwards towards the engine and passenger compartment, so make sure you get it right.


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