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Discussion Starter #1
I turn to you forum members for any help and/or advice you can provide.

While on an Interstate driving my horn goes off. It was humorous at first as I thought it was someone else. The horn sounded constantly for about 15 minutes then went off for the next hour whenever it felt like it. No error codes were displayed on the console.

No horn problem the next day.

Gave the wife the car she drives to work - no problem. Get off from work, into the car, starts it up....the horn goes off again. Not humorous anymore, the wife did not find it funny.

Took the car to the dealer, Valley Motors, the next morning waited 5 hours and was told they could not duplicate the problem. But charged me $90 in labor.

Started the car to run an errand....horn goes off! Drive directly to the dealer. The dealer test drives the car the next day and while on the road, the horn goes off. This time 2 cars back is a policeman and he pulls over the technician.

So far they have not determined the cause of the horn problem, but continue to charge me labor to find it. I'm at $450.00 and was told by the dealer that they attempted to replace the SAM unit and the problem still exists. They have traced the horn connection and still no resolution.

Should I keep letting the cost mount up? Who can I escalate this to at Mercedes-Benz or even Daimler Chrysler. What should I do?

Any and all advice on how I should proceed is greatly appreciated.

Thanks!
 

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I can't imagine this would be overlooked, but if your airbag is not very tight against the wheel, it will activiate the horn at random moments because of intermittent contact. I would pull the airbag and make sure none of the contact points are bent or shorting. The hown circuit is about as simple as it gets, so I can't imagine what is throwing the dealer for such a loop. Please post the results of this ordeal, as I am quite curious as to the cause.
 

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Re: Intermittent Horn C320

Thank you very much for your response, Phaedrus242.

I cannot image that they would charge me so much, and not find the problem. You have a great recommendation. I will definitely post the resolution of this issue.

In the meantime, I've been fairly busy online with this by sending email to MBUSA Customer's Online, filing a complaint with the NHTSA Office of Defects Investigation (confirmation number 10073090) as well as posting to other online Mercedes-Benz resources.

Here's the link to ODI: http://www.odi-nhtsa.dot.gov/ivoq

Thanks again for your help.
 

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I had this very same problem with my '98 c230. Took it to the dealer and they said it needed a new steering wheel, as the contacts for the horn and the steering wheel are one part. The part is about 700 bucks! 8O

Anyway after beeping the horn from all the different areas of the steering wheel, the problem went away. I suspect there was some corrosion of one of the contacts that went away after "banging" on the horn pad.
 
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