Changed fuse and horn relay with parts that I know are good. Still no power supply to horn. Is there a fuse somewhere in between the steering column and the fuse box. What wire in the steering column is for the horn? How do I access the steering wheel horn switch (where the pad sets off the horn)
Usually the wire from the steering wheel is Green w/Red and the wire to the horn from the fuse box is White. There is only one fuse, sometimes shared with the emergency lights. Check to see if there is power to the horn itself with a volt meter.
Have you checked the horn itself? try disconnecting the power line to the horn and check power supply with a simple tester. have someine assist you to press on the horn switch while you are checking. if the tester needle deflects then it could be the horn. P.S. make sure you set your tester to 12volt/24 volt dc setting. GOOD LUCK!
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The relay is powered at all times . In order to sound the horn the ground side of the relay needs to be grounded. It is grounded to the steering column through the horn button . In other words the horn button wire has been grounded to the steering column. Remove the steering wheel (requires a puller) and remove the locking plate, under the lock plate is a disc or cam, something in there is damaged maybe a wire with a spring, or the cam. Good luck.
Should have a fuse box under drivers side dash and a fuse box under the hood. I think the horn fuse is under the dash on drivers side. usually 10 amp. I would get a test light and a friend and have the friend push the horn while i held the test light on the horn connector wires. It has two wires a voltage and a ground. If fuse is good but still no power at the horn then check the switch in the steering wheel. You could have a bad "clock spring" or steering wheel switch.
new horn or relay gone most likely but make sure it is grounded good or wont work either hook battery booster cable from negative battery terminal to horn bracket if it works then clean mounting area under horn ground is bad
If you know the fuse and relay have power, you should be able to jumper the relay and make the horn blow. The horn pad on the steering wheel usually grounds the relay. If you can jumper the relay and make the horn blow, the problem may be the horn pad or the clockspring in the steering column.
Check the horn relay to see if it works. Most cars use the same relays for multiple other functions. Check the part number on the horn relay and find another relay that is working that has the same part number. Swap out the horn relay with the known good relay. If that doesn't work, check all the wiring in association with the horn. If all the wiring is sound, then it is probably the horn itself, but that is very rarely the case.
HI, Try to find out first what is the part that cause the malfunction of the horn. The three major part of the horn is the relay, harness & horn pad, and horn itself. Check the relay if it is functioning by replacing it with similar type ( if you have the spare or a similar relay in the relay/fuse box in engine compartment ). Let somebody push the pad horn and if you hear a clicking sound on the relay, it means there is a current that activates the relay( no probs from the horn pad and harness ). Check the horn, just get a wire and directly connect it to the positive pole of the battery and connect it( wire ) to the positive terminal of the horn, it should activate the horn, if not the problem is the horn and you have to replace it.