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post #1 of 3 (permalink) Old 12-18-07, 09:52 PM Thread Starter
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Horn doesn't work.

Hey all...my fiance has a '00 Expedition and one night we went out to dinner and valeted. The valet came in a few minutes later and said the horn won't stop. I walked out there and could hear blaring constantly. By the time I walked up to it, it stopped blaring and was silent. So we locked the door and continued the night. When leaving, the battery was dead and we needed a jump. Obviously due to the horn.

Now, the horn does not work at all. When you press down it does nothing. The engine starts as normal, nothing else wrong. Just the horn does not work.

Could it be a fuse, perhaps had a short, or is the horn dead?

Thanks in advance!
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post #2 of 3 (permalink) Old 12-22-07, 10:13 PM
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Re: Horn doesn't work.

Could be a short in the switch or clock spring in the steering wheel, a short in the wiring or a bad horn relay. I'd start with the least expensive item--the horn relay. That's also the most likely culprit--although I have heard of clocksprings and switches going bad.

I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology. Visit my blog for cool articles and TSB's: http://www.ricksfreeautorepairadvice.com/
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post #3 of 3 (permalink) Old 01-26-08, 07:00 AM
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Re: Horn doesn't work.

I had this problem in a Town Car. The horn switch was shorted. That's what happened to you. After the horn blow long enough the fuse probably blew. That's why by the time you got there the horn stopped. It could have been the relay, but that's unlikely. The relay would have to be told falsely to energize. It could happen, but I doubt it. Besides you could check the horn relay with a DVOM to see if it's good or bad. It's not the clock spring because it is a N.C. contact. If it failed it would fail OPEN and the horn would never blow if the clock spring failed instead of blowing all the time which is what happened to you. The customer told me the dealership wanted $800.00 to fix this problem. That's because the horn switch is inside the Air Bag. You can't fix a shorted horn switch. You have to replace the whole Air Bag assembly for $800.00. What I did was removed the Air Bag and drilled a small hole thru the steering column at the top as far back as I could in the space where the Air Bag was removed. I then cut the harness going to the horn switch(it was shorted so it was defective anyway). I soldered some speaker wire to the harness where I cut the harness and shoved it thru the hole I just drilled. I put the Air Bag back in after reconnecting it. I then installed a Doorbell switch where the wires come out of the top of the steering column. It works and it only cost $5. The customer says it is OK because she only blows the horn once a year when she takes it in to have it inspected.
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