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Re: horn will not sound from steering but okay otherwise
You need to Check the Wire inside the Steering wheel, When Grounded by pressing horn button the relay will send the 12 volts to Horn,
You Also could and Please Re-check the Color of wire for the Horn SHOULD be a Black Wire in the wire loom Under the Dash on the Column and If you Ground down the Black wire from Under the dash, You would Find out If it is In fact the Steering wheel it self,
you could also add a Second Button on the Dashboard
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Switch is in the steering wheel. The horn itself is in the engine compartment to one side of the radiator, between the radiator and front grill. Usually on the drivers side.
More likely to be the horn that is faulty as it is in a pretty hostile place with water and salt spray. Test it by putting a wire from the battery to the horn contact. The one to earth will cause a spark, the other one should make it sound.
First check the fusebox. Otherwise use a multimeter to check whether it's the horn itself or the horn's electronics / mechanics on the steering-wheel. If it's the horn, you can get a 2nd hand part and replace it yourself. When its on the steering-wheel side; take it to a garage instead; you don't want the airbag to blowup in your face :)
Do you get a click when you press the button? The relay should be audibly clicking if it's working.
If it is clicking then I'd check the horn itself, might be bad or have loose connection. If no clicking sound at all then I'd suspect bad relay or fuse (if it has a dedicated one), also possibly bad switch.
start at the horn to see if it the wire is connected, then i would remove that wire and use a jumper wire from a positive(battery) to the horn itself and see if you get any sound. If the horn beeps then the horn itself is not the issue. check your horn fuse and relay. if you are getting power at the fuse and relay it is somewhere in the steering column. possible the horn pad itself or the horn cam. If you have have this in for repairs in the past dealing with the steering column it might not have been hooked back up properly. but then again how often do you use your horn it might have been not working for quite awhile. hope this helps.
you need to find the wire connected to the horn of the vehicle and follow it back to through the firewall and make sure that it is connected to the horn itself. If not you will need to run another one. Also check the fuses
Check the horn actuating contact at the centre of the steering wheel. It may be damaged or mis-aligned.
Also check the carbon contact that runs on the slip ring under the steering wheel (associated with steering wheel horn actuate switch) It may be damaged or mis-aligned.
If none of the above are faulty, you should look for a possible intermittent short to ground on the horn actuation control wiring.