R52 Horn blows by itself?

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Dec 4, 2018 | 09:33 PM

computerdoc

Thread Starter

1st Gear

Joined: May 2008

Posts: 50

Likes: 1

From: Frederick, MD

Horn blows by itself?

Took my 2008 Sidewalk to the car wash, and on the way home, the horn started blowing by itself. First a couple of toots, then steady. I pulled over, couldn’t find the fuse box and it eventually blew a fuse. Took it to my non-Mini mechanic who said the horn button was a little sticky, but he could not find the reason for the problem. He replaced the fuse and it worked fine for a few weeks. One day last week it tooted a couple of times on its own again, and I immediately pulled the fuse. Anyone else experience this or any ideas what might be causing this and how to fix it?

Currently hornless.

Dec 5, 2018 | 07:13 AM

Tgriffithjr

5th Gear

Joined: Jul 2018

Posts: 766

Likes: 80

From: Texas

Probably your horn button. Horn circuits are very simple. Horn can’t blow unless it gets power and that power can only come through the horn button/switch.

Dec 5, 2018 | 08:56 AM

MVPeters

5th Gear

Joined: Dec 2013

Posts: 775

Likes: 145

From: Northern MA, USA

I'm not certain about the current MINI, but historically horns often had a permanent live 12V feed to them - the horn button provides the ground.
If the horns got wet from the car wash, it's possible that the horn-button / ground side of the plug, or perhaps the wire, got wet enough to short out to ground.
I think I'd check & clean the plug.