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If it uses the OBC, the horn is different. (archive)
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Posted by george on May 06, 2002 at 14:55:00:

In Reply to: BMW alarm with magnetic key not working to 100% posted by Sonny, Sweden on May 05, 2002 at 11:13:40:

Our cars have three horns.

1> Hi Tone
2> Lo Tone
3> OBC Horn

The OBC horn is on the driver side on my US Spec car, behind the bumper. You may want to take a look at it and see if its working.

The normal "wheel" horns have a "trumpet" design, where as the OBC is a Hella style round horn.

I learned this when I upgraded my horns to Hella SuperTones.

-George

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