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Disconnect from metal plate on steering wheel horn presser in middle under cover and bypass steering wheel as horn and now swtick preferblty one that springs back when not being touched,( like a dorr bell button) add a swtich to the two wires and mount in spare ac demister fog light section above radio on close so you can use without being dangerous while driving. 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.
problem is under the steering wheel,if vehicle has air bag its best entrusted to a garage,if it hasnt then just pull steering wheel off with a special puller and check the carbon brush and the wires and contacts in the steering wheel itself.This is a simple job but without the right tools ???
About four things to do, first check voltage at horn with key on and button pressed. If voltage there try moving the small gap screw back and fourth a few times. If that doen't work replace horn. If no voltage check fuse and horn relay, you should be able to hear the relay click when you push the horn button, If not and fuse is ok. Switch relay out with another on on the car. If that doesn't fix it check the horn button for continuity.
replace the horn relay under the glovebox. the bottom panel comes off and you will need to get your head and a lightunder their and have a friend hit the horn so you can find out which one is clicking. once you find it tag your wires and replace it. hope that helped.
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.