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Check the horn itself by running a wire from the positive lead of the battery to the connection spade on the horn. If it works, you may have a bad horn relay or the problem may be in the steering column. If you have air bags, DO NOT attempt to work on the column unless you exactly follow directions for that found in either haynes or chilton manuals. Otherwise, your air bag may deploy and hurt you. If the air bag light on the dash is on, chances are that the "clock spring" in the column has failed.
check under the hood in the fuse/relay box for a blown fuse or relay. also there is another fuse panel under the dash next to the steering column. when u take the cover off the fuse/relay box under the hood look inside the lid and it will tell u which fuse/relay controls the cruise/horn/etc. hope this will help you!!!!
get a long wire and test the horn directly from the battery positive, if it works many times the vibration clears the problem, If you press the horn and do not hear a clicking sound from under dash, find fuse box in engine compartment, study all relays, find two that are exactly alike and swith with horn relay, test, if it works, there it is!
check all your fuses first. if they are all good, remove the horn relay and check to see if it has power to it with key on, horn not pressed. it should. if it does, check to make sure the power is flowing through the relay when horn is depressed. theres should be a wiring diagram on the relay. if power is not getting through, replace the relay, if it is getting through you have a broken wire between relay and horn.
horn is under the hood. usually right against the grill or mounted on fender well. fuses for horn can be under the dash, or in fuse panel under the hood.
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.
The fuse can't click it is probably the relay that is clicking. Check fuse #2.37 it is the 12th from the bottom row of the central junction box from right to left if it is ok ground the dark blue wire coming down from the steering column to check the horn pad and ground. If the horn works you have a problem in the clock spring or ground. If it doesn't check for 2 pins at the horn relay in the central juntion box for 12 volts if you have 12 volts at 2 pins with the key on then jump pin 30 of the relay with pin 87 of the relay and see if the horn goes off if it does have someone press the horn pad and see if you get a ground to pin 85 or 86 of the relay if you don't you have a ground problem to the relay if you do the the relay has failed. If you jump the relay at the central jumction box between pins 30 and 87 and the horn doesn't go off then the horn has failed or isn't properly grounded. Then check the horn for power with the horn pad depressed if there is power at the horn connector. Hold a test light on the ground wire for the horn from the ground of the battery and see if your test light shows power if it does then you have a bad ground to your horn if it doesn't then your horn has failes.
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