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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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
Your horn circuit is very simple. It consists of the primary circuit, which controls the relay coil and the secondary circuit that applies voltage through the relay contacts to the horns.
The Horn fuse (10 Amp) in the engine compartment fuse block supplies the battery power for both the primary and secondary circuits. This fuse is haot at all times (regardless of the ignition switch position).
Battery power is supplied to Pin 1 of the horn relay. Pin one of the relay connects to both the relay coil and to the secondary main contact.
The ground for the relay coil is provided via the GREEN/BLACK wire through the horn switch. If the relay is clicking when you push the horn button, then the primary side of the horn circuit is working.
When the relay coil is grounded by the horn switch, the relay contacts come together (that's what makes the clicking sound) and supply voltage to the GREEN/WHITE wire that connects to the horn assemblies.
Check for battery voltage at the horn when the horn switch is pressed. If there is no battery voltage present, then the only thing it can possibly be is dammaged contacts in the horn relay or the GREEN/WHITE wire is broken between the relay and the horn.
If there is voltage present at the horn on the GREEN/WHITE wire, the only possibilities are bad horn assemblies or a bad body ground that is not allowing the horns to ground properly. A bad ground condition can be verified by running a jumper wire from the battery NEGATIVE post and connecting it to the mounting bolt at the horn. If this makes the horn work, then you probably need to repair your body grounds near the battery.
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.
10 amp fuse located under the hood on the drivers side fuse block........there is also a horn relay that is in that same fuse block.......if both of these are good get a test light and unplug the horn and get someone to hold the horn on while you check and see if you have power going to it.if you do then you know that the horn is bad and sometimes you can tap on it and get it to work......if you do not have any power and youknow for sure that the fuse and the relay are good then i would be checking the spiral cable. it is a ribbon that has wires in it and spins as the steering turns and the will break sometimes.......i would let a certified technician check this as it is part of the air bag system......good luck and i hope this info will help you......let me know or fixya know if i did my job and a thumbs up........thanks and if i can help you any further let me know i have been working on toyota and lexus for 25 yrs.................
If the horn works with direct connection, and fuse, relay, and circuit breaker are all good, it's the switch in the steering wheel. If it is anything like the chrysler auto's, the switch and the air bag module is all one unit, can't replace just the switch, the whole thing, and it's about $700 to $800 for those units, at least it is here, and can only get them at a dealer.
the horn is located behind the bumper, you will need a test light to
test for voltage at teh horn connections, if there is 12 volts at horn
connections, this means th horn is faulty.
if the horn is okay, check the horn relay - and if that is okay it could be the horn pad inside the car.
But it will most likely be the horn itself that is faulty.
Ask your local garage / mechanic if you are lost!!!