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Re: horn comes on by itself in cold weather
Most Of the time it is in the steering wheel. The cold makes the cover tighten up and puts pressure on the horn switch inside. Can also be an easier problem; The horn relay might be on it's way out. I sincerely hope that I could help you on this. Best wishes.
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if you check the wire that comes from the horn button to the relay for voltage when the horn is pushed and have voltage then you have a bad relay,if not then you probably have bad contacts in the horn pad area or even the clock spring itself.
Hi, If the horn only honked once it may be a symptom of your car alarm being set off after power has been re-applied. If the horn stays on after you reconnect the battery you have either a stuck horn button on your steering wheel or a stuck horn relay. Or it could be the alarm sounding the horn but that usually that occurs in a series of horn blasts (rather than continuous) and the car indicators usually flash in sync with the alarm sounding. If the horn is stuck on in a continuous blast ie not sounding on and then off and then on etc etc, disconnect one the battery cables then pull the fuse that feeds the horn or pull off one of the removable spade electrical connectors from one of the 2 terminals on the horn itself. Usually the fuse box is either under the dashboard on the drivers side or could be under the hood. Consult your user manual for your car for fuse and horn locations. If the horn is stuck you need to visit a qualified auto electrician, or perhaps you have a friend who knows his way around auto electrics? Cheers, Steve (Melbourne, Australia)
The switch is behind the air bag. You can disconnect eh negative battery cable for a few hours, then pull the SRS fuse, then remove on the back of the steering wheel, remove the screws and the SRS bag, then check the horn switch and wires. The switch or the spring could be bad.
since heat caused the problem, i used cold for the fix.....there are several types of canned "FREEZE" that are used for electronic testing...i sprayed the steering wheel--twice. i think it released the weight of the steering wheel cover on the horn contacts...that or my prayers were answered......whatever the fix----currently AIN'T BROKE.....