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MUCH more likely, Wendy, is that the horn has burned out (they do that) or the horn button inside the steering wheel has stopped working because of corrosion (they do that, too). It's HIGHLY unlikely that any wire anywhere has been broken. It's POSSIBLE that the plug at either the horn or the horn button has come loose, though - that's a thirty-second no-parts repair at the horn, or a ten-minute no-parts repair at the button.
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Try connecting power directly to the horn and see if it goes off. If not, it would seem it needs replacing. If it works, maybe the horn switch on your steering wheel is broken. A simple process of elimination.
There is usually only 1 wire to the horn from the steering column, via a relay. Disconnect this wire and run a bit of wire from the positive terminal of the battery direct to where you took the wire off. The horn should sound. If it does, then you know the horn is ok and the fault is probably the relay , broken wire, blown fuse or poor connection in the horn circuit. If the horn doesn't work, then you know that the horn itself has failed.
Some models have single horns, others have two (or more).
Some horns are already earthed, hence may not require the use of an earth wire.
If you have noticed a spare wire/connector coming off the horn harness, this could simply be part of the standard factory horn harness (which was also used for the multiple horn types), making this a redundant connector.
If your horn is working, then I believe the all is in order. If however, your horn does not work, then suspect there is a broken connection.
Before you pull the wheel (which involves removing the air bag unit) you can test the horn switch at its connector with the cable reel (newfangled horn ring). First remove the dashboard lower cover under the steering column. Remove the steering column upper and lower covers. Disconnect the dashboard wire harness connector (4 pins) from the cable reel. Check for continuity between the cable reel no.2 terminal (light green/blue stripe wire) and body ground in each horn switch position. There should be continuity when horn is pushed and no continuity when horn is released. If one or both continuity checks fail, then you'll have to remove the airbag and change out the cable reel.
Disconnect the battery terminals and have the engine off and cooled down. Locate the horn under the hood on the front of the vehicle. Unplug the wiring harness and then unscrew the bolts for the horn. Replace with similar horn and bolt in. Plug in wiring harness and reconnect the battery terminals.
The horn pad is made of vinyl which contracts through the four seasons causing this problem for some. Remove the horn pad with the battery disconnected first of all. Use a jumper wire to see if the horn works. If id does check the horn relay next. If ok hot wire the horn direct. One should be your problem or it is a broken wire instead
The most common cause is that the ribbon contact drum under the steering wheel is faulty and has a broken filament. The part is called the "clock spring contact drum"
check for broken wires the neagative is by the horn button in the steering wheel has air bag ever been replaced in steering wheel if so the wire may have not been plugged in
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