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Re: 1985 Toyota Pickup Horn
Probably the switch in the steering wheel, or fuse, but usually horn fuse works other things too such as cig lighter or radio. If everything else is working fine, then to troubleshoot you'll need a testlight. I would start with the wiring harness where the steering collumn plugs in and decipher which wire is the horn wire. Put the test light clip on +power, then check the wires on the collumn side one by one, pushing the horn button on each one. The horn switch is the wire that makes the light blink when you push the button. If you try all the wires and none make the light blink, then its probably a problem with the horn switch in the s. wheel. Does it have an after market steering wheel? Because aftermarket wheels often have crappy horn switches in them. Also could be a horn relay if it has one. If you listen carfully while pushing the horn, you should hear the relay faint clicking. If you hear this, then the switch is working, but the relay might not be. Follow the sound to find it if you hear it. Test all sides of the relay with your light. Should get power constant on one term, and the other two should light when the horn button is pushed. Hope this helps. Cheers.
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The horn relay primary receives + full time and is actuated by receiving ground (-) from the horn button. Check ground continuity at the horn button (at the steering wheel) to make sure it is working first (most likely culprit). If the horn button is working, check to see if the horn relay is working (second most likely culprit). To test the horn relay, provide chassis or battery ground to the (-) primary terminal of the horn relay and see if the horn honks. If it does, that will tell you that the problem is in the wiring between the steering wheel and the relay, most likely a disconnected wire at the steering column.
The only other components in the system are the fuse for the horn circuit (if you have 12v at the horn relay, that is fine), and the horn itself. My bet is on the horn button pad itself.
Sounds like the horn button is getting hot and warping,causing it to close the circuit and activate the horn.I don't remember if the horn switch is part of the airbag or seperate.If the horn buttons are seperate,just replace them.If they are part of the airbag,the proper repair aint gonna be cheap(you'll have to replace the airbag).A low tech solution would be to lower the interior temps when parked.(maybe get a set of VentVIsors that allow you to keep the windows cracked open while keeping the rain out,combined with one of those reflective silver windshield panels).
no. a horn will not be directly associated with a battery, if so you would have other components within the car that were not working.
I would suspect a horn problem itself or one of the electrical components
when I had that problem it was the contacts under the steering wheel pull the steering wheel and you will see a copper ring the horn is connected to ground out that copper ring against the steering column if the horn sounds you have a worn contact I fixed mine by putting a spacer under that copper ring good luck with it
From memory, the horn circuit is actually completed by the steering shaft and in the engine bay there is a coupling, and looping from one side of the coupling to the other is a wire - check that this wire is in good condition. My next piece of advice would be to remove the steering wheel and check the condition of both the spring pin and the brass ring it rubs on.
you may need to put a relay in it as the current from the horn may be back feeding up the immobiliser horn circuit and causing a short. Sounds like the immobiiliser has its own source of power seperate from the factory circuit When you press the horn the power goes to the horn and up the immobiliser horn circuit and it blows the fuse.