Question about 1995 BMW M3

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M3 convertible horn

Hi My M3 's horn has packed up, It only has a single horn the local garage states it should have 2, one high and one low tone.Is it 1 or 2?
Can someone help to pinpoint the exact relay in the fuse box that operates the horn circuit? thanks John

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  • English John Jul 02, 2008

    it looks like someone in the past has removed one horn, I'll purchase 2 new horns and splice the wire from the existing one and make it as the original. thanks

  • English John Feb 06, 2009

    PURCHASED 2 NEW HORNS FROM BMW SPLICED THEM IN NOW IT WORKS AS IT SHOULD.

    THANKS FOR THE RESPONSES,

    "PUT THE ROOF DOWN AND FLOOR IT"

    ENGLISH JOHN

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Hi,

I have to agree with your local garage, to my knowledge, most BMW uses two (2) horns; High Tone - 510Hz and Low Tone - 410Hz. A Hella or Fiamm aftermarkets would also work. As to the location of relay bank, have you tried looking behind/under the glove compartment/box? The relay would be a standard 4/5-terminal type.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jun 29, 2008

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You will need some help , but unplug the horn and then depress the horn inside the car and you will be hable to hear a clicking noise, either inside the car or in the engine comparment, have some one locate the noise while you keep depresing the horn on and of to get it ti click on/off
and other thing there is many cars with only one horn make sure to try contacting the dealer and ask for service department and ask for it, you should be hable to do it by phone using yellow pages, or getting the phone number at by calling 411

also when you locate the clicking noise thats the horn relay
i will apreciate the feedback thank you

Posted on Jun 29, 2008

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Unplug the electrical conector and press the horn on the steering wheel. If you hear a click from the relay thats great, if it still don't work they are useless and need to be replaced. You will need 2 aftermarket ones high and low tone. It will be worth it checking the supply to the existing horns at some point, just connect the car horn to the battery via cable if the horn is ok it will sound. By doing these simple steps you should eliminate the fault. Cheers Hope this helps English John

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