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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-20-2012, 05:46 PM   #1
Silver325
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DIY- Horn replacement, PIAA

Both my horns went dead, searched but could not find a complete DIY on the subject so I put a short one together.

In my case, I could tell he steering wheel switch was not at fault because when the car was off and the key was in position #2, I could hear the relay clicking, its behind the glove box.

Purchased the PIAA horn set from Bav Auto. Comes with two horns, one 600Hz and one 500Hz. Only showing one here, the other one was installed at this point. $50 for the pair, versus $45 each OEM.



Both horns are in the front bumper. You get to them by removing the lower splash guard in the wheel well. Put the car up on a sturdy jack stand and take the wheel off. There are three 8mm hex head screws and one 10mm (can only see three in this pic. There are two more 8mm screws at the bottom going through the bumper. Seven fasteners total.



You can see one of the lower screws removed in this pic. You will need to pry apart as shown to slide the guard out.



Once the splash guard is free, unclip the wire harness to the probe.



Now you have good access to the fog and the horn.



The 10mm nut holding the horn in the bumper is at the tip of the screw driver.



Unclip the wiring harness to the dead horn.



The new horns connectors don't mate up to the BMW harness, so I removed the BMW connector and installed these connectors. The brown wire from the BMW harness is the ground side.



Wrapped the connectors in tape to keep out the elements. Power goes to the top tab on the horn, ground to the lower tab. I just used spare wire I had, so power is blue and black goes to ground.



Next, you will need to remove the bracket from the old horn and bolt it to the new one. I found a bolt that matched the threads on the original nut.



Then bolted everything back in place. It won't go back exactly the same as original, you will need to play with the angles to make it work.



Finally, plug the probe back in and put the splash guard back in.
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Old 11-20-2012, 06:07 PM   #2
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pretty cool. how does it sound? vid?
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Old 11-20-2012, 06:33 PM   #3
Silver325
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Doesn't sound much different than OEM, at least not to my ears. Perhaps a slightly higher pitch. The BavAuto site has audio clips, see http://www.bavauto.com/shop.asp
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Last edited by Silver325; 11-20-2012 at 06:52 PM.
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Old 11-20-2012, 06:41 PM   #4
Bimmer4Lyfe
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awesome! I bought a horn 6 months ago...but haven't put it in yet.... this will help!
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Old 11-15-2014, 01:26 AM   #5
Riverbmr3
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Are the horns located at passenger side?
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Old 11-15-2014, 01:31 AM   #6
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Quote:
Originally Posted by Riverbmr3 View Post
Are the horns located at passenger side?

The pics show the passengers side unless they are reversed pictures.
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Old 11-15-2014, 05:29 PM   #7
Riverbmr3
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There are 2 piaa horn at bav auto, part no. 85112 or 85112k, does it come with the harness?
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Old 11-16-2014, 07:37 PM   #8
Silver325
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Two horns, one on each side, so you need to do this from both wheel wells. As I mentioned, these horns do not plug into the BMW harness. You need to cut that plug off and graft in the female connectors.
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Old 11-18-2014, 06:08 PM   #9
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I think one of mine is out because it just sounds too faint to me.

Surprised BMW didn't put a light on the dash for it like everything else that fails.....
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Old 11-19-2014, 09:23 PM   #10
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So Cool
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