I have power to the relay, and when i ground they relay, the horn works, but when i push the horn button, it does not work. I figure the horn button went bad, I plan on installing another button, but I don't have a wiring schematic to know what color the wire is for the horn button, any idea other than buying a chevy repair manual, I have one, but it does not give the wiring schematic for the horn, it just had a "typical" horn schematic.
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Re: 1998 S10 Chevy Horn not working
You most likely need a new clock spring rotating contact under the steering wheel, it is a plastic ribbon with wire in it to connect the horn button and other accessories to the steering wheel while allowing the wheel to turn.
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The relay is located in the under hood fuse / relay box . Marked HORN PCB relay , If you change it out an horn still doesn't work ,you can test to see what is missing right at the relay . Two of the pins at the relay socket should have battery + , one should be open an the other should show ground 0 ohm's . If you look on the side of the relay there is a diagram of the pins. 30, is Battery +, 87 goes to the horn . When you push the horn button on the steering wheel it causes the relay coil to energize closing the contacts in the relay sending power from pin 30 to pin 87 down to the horn turning it on ! Pins 85 an 86 are the control side , one should have battery + an other should be open , till someone pushes the horn button . You can test for power with volt meter an test with ohm meter for ground on the one , an a open on the other one, an have someone push the horn button an it should change to 0 ohm's .
There are some connectors behind your steering wheel that may be messed up. My 1999 chevy s10 had a dysfunctional horn I had to remove the airbag from the steering wheel to access the wiring harness to the horn and i had a broken wire that caused the horn not to work I replaced that and problem solved. Also Your actual horn is usually located in your front bumper and that may be damaged if it is replacing it will fix the problem. Hope this helps good luck
You would need to check the circuits at the relay. The horn pad grounds the relay to make the horn blow. You should have power at the relay, and a ground from the horn pad when it is pressed. The third wire goes to the horns.
Unplug the wire to the horn and make sure you have the horn grounded really good. Take a hot wire and run it from the battery to the horn. touch the hot wire to the end of the horn and see if it works. If it does not work then you need to replace the horn. If the horn works then take a test light and hook it up to the horn wire and have someone push the horn down. you should have a hot wire. If you don't them check the horn fuse. Let me know if this works.
Diagram should be on the inside of the fuse box or relay cluster lid/cover. If Test light has 1 wire and a sharp tip? Yes, but only if you push the horn button too ;-)
My guess is that the horn lost its ground, but you can check this with the light. The horn only beeps when both GROUND and Pos 12v are present. The horn button gives the relay 12v to close, and the relay gives the horn 12v to operate. The ground is always connected.
Connect tester clipwire to 12v source (battery, headlight (has to be on) and touch its tip to metal of car. Does it light? Good. the tester is working and the 12v is a good source.
Touch one of the 2 horn connection or wires (poke it thru the plastic - why tip is sharp). Does it light? Touch the other, does it?
If both light, (1 will be brighter) we can assume the horn coil is good and it is getting a good ground and I was wrong (it happens... but not often). The side that is BRIGHTER is the ground wire side.
Now have someone mash the horn button. Do you hear a tiny click? That is the horn relay. If not, look for the horn relay fuse and replace it. If you DID hear the click, the relay coil is good and is trying to switch 12v to drive the horn.
Now is time to locate and replace the horn fuse or the relay may have bad contacts. Look at the other relay part numbers in the cluster and see if there is a match for the horn one. Swap it out and try the horn.
Hope this all helps. To 'test' the horn, touch the dim side again anf listen for a scratching sound. That is the 12v going thru the tiny bulb in the tester (a resistance) and trying to drive the horn.
If you hear a click the power is working the relay. If no click under dash, possibly bad fuse or relay. If you hear relay, test horn. Unplug horn and run a 12V jumper to see if it beeps. If it doesn't, try to redo the ground and then test. Then if that doesn't work, replace horn.