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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 06-02-2012, 04:14 PM   #1
YGOSLO
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Dead Horn?

I was out driving last weekend and honked at another M3, or at least I thought I did. Loud music, car noises, etc. I figured they drowned out the sound. Then this morning I pulled into the parking lot at work and honk at a co-worker and I get an abbreviated honk and then nothing. I hit the horn a few morn times, nothing. So I check fuses 5 and 55, they're good. I try the horn again and it honks but cuts out again. Then nothing, again. Any ideas?
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Old 06-03-2012, 05:09 AM   #2
YGOSLO
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Ok, so it's not completely gone this evening I was driving around and tried it and it sounded like someone was stabbing a lamb. It was a pathetic wailing of a horn. Either way, it's not very safe so, any ideas?
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Old 06-03-2012, 10:06 AM   #3
E46NYBMW
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Do you still have all steering wheel functions? My horn with all steering wheel functions and light went out when my clock spring went bad.
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Old 06-03-2012, 12:17 PM   #4
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Yes, steering wheel functions are still there. On occasion when I turn the volume down the track/station forward button activates, but it's been like that since I've owned the car.
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Old 06-04-2012, 12:15 PM   #5
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If the clock spring is good then that leaves the horn relay and the horn itself. Try swapping the horn relay with one of the other relays as a test. Here is a map of the relays located behind the glove box www.bmwgm5.com/E46_relays.htm.
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Old 06-04-2012, 01:28 PM   #6
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How do I determine if the clock spring is functional? Or is it safe to assume that if I still have my steering wheel functions that it is good?
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Old 06-04-2012, 03:40 PM   #7
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How do I determine if the clock spring is functional? Or is it safe to assume that if I still have my steering wheel functions that it is good?
If the other steering wheel buttons are good then the horn is probably good, but, not a 100% sure thing. Taking the assembly apart to check is not easy and you risk damaging the flex cable. Try putting your hand on the horn relay while tapping the horn button. Make sure the relay clicks or just swap it with the A/C relay. Use the web page I posted earlier to determine which relay is the horn and A/C.
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Old 12-28-2012, 04:23 PM   #8
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Ok, I finally got around to doing this. The horn relay clicks when I press the horn button. So now what? Is it the clock spring? I really do not feel like disassembling the steering wheel.
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Old 12-29-2012, 01:17 AM   #9
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Before you tear into the steering wheel, check the connections at the horn its self.
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Old 12-29-2012, 11:10 AM   #10
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Will do. You would think if I press the horn in the steering wheel and the relay in the glove box clicks and everything in the steering wheel is working. But, I don't engineer anything for a living so.... Thanks.
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Old 12-29-2012, 01:46 PM   #11
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Will do. You would think if I press the horn in the steering wheel and the relay in the glove box clicks and everything in the steering wheel is working. But, I don't engineer anything for a living so.... Thanks.
I'm right there with ya, I would look from the relay on.
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Old 06-21-2014, 08:44 PM   #12
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Update: it turned out to be the horns themselves. Bought new horns and replaced them, good to go. And for the record, horns on the e46 M3 are behind the bumper on the driver side. No need to remove the bumper. Take of wheel arch liner on driver side and get it from underneath. And yes, it has been two years.....
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Old 06-23-2014, 04:35 PM   #13
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i think we have 2 horns, a high and a low, one of yours may need to be replaced. no big deal.
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Old 06-23-2014, 11:03 PM   #14
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You are absolutely correct. Both were dead. See post above yours.
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