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things to check. fuse,horn relay,horn button and then the horn itself. by pressing on the horn button with the car off you should hear a click everytime you press the button. that would be the relay working. if you hear this then either the horn itself is bad or disconnected.
Check fuse for horn and for dash lights. If the interior lights work then suspect dimmer switch for the dash lights. If you press the horn button do you hear a click under the hood or inside the car? If you do not then the fuse is blown and if the fuse is good then the relay may be suspected bad. If the fuse is good and the relay clicks then suspect the horn to be bad. If fuse is blown and you put a new one in and you push the horn and the fuse blows again, then disconnect the horn before replacing the fuse again. Then push the horn button and see if you hear the relay click if you hear a click the the horn is bad or wiring butmost likely the horn. If you have the horn unplugged and the fuse is good and you push thee horn button and no relay click suspect the horn button to be bad. Hope this helps.
If you press the horn button, can you hear the horn relay?
If not, it could be the horn button, or the relay,
If you hear it click on and off it is then likely the relay.
Test the horn button with a meter. if it is working, replace the horn relay.
Check the fuse for the horn.
Check the wires have not just come loose on the horn.
Next, if you have a volt meter, disconnect the horn, and connect the wire for the horn to the meter.
Have someone press the horn button.
If you have a reading of 12 volts or better, the horn is dead, if you have a reading of less than 12 volts, the the horn relay is likely faulty.
That is the item that is clicking as you reported. Just because it is clicking does not mean it is passing power through.
Make sure the horn is grounded at the base of the horn where it is mounted.Also run a gound from negative battery post to the frame and body.Also check the horn by running a positive wire from battery to the horn,while making sure of a ground.If I can help lrt me know.
Here is a pic of the horn location.
Go to NAPA or Autozone and get you a cheap 12V test light usually 5 to 6 bucks.
Hook the clamp end to a good ground like a metal bolt or battery neg. cable then touch the light end to the battery + cable to make sure it lights up.
Now hook the light to the horn connector and press the horn button and see if it lights up. If it does then the horn is bad. If it doesn't then let us know.
It could be both. You can use a flat head screw driver and pop the top off the steering wheel to see if any wires have come undone or you can look either under the hood, behind the glove box or under the steering wheel/column for the fuse box.