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You could check if current runs to the horn wires when the horn switch is pressed. If ok, then the horn itself may be old. Next thing is the fuse, the grounding source, the horn-wire plugs.
I would suggest to you to have the spiral cable (or 'clockspring') replaced. This is the electrical unit that transfers power to the air bag, the horn and the cruise control.
It is located right under the seering wheel.
Your description of the issue indicates to me that your spiral cable is loose, and making intermittant contact. If the vehicle had an air-bag deployment, this cable-device should have been changed.
save yourself the hassle , buy yourself a momentary 12volt switch drill a nice clean hole on your driversside dash and re-wire your horn to it, all the screwing around you'll do to figure out why toyota makes cheesy horn contacts you could have your problem fixed..
on one side of the switch you should run a wire that is a 12volt switched + on the other side I would run another side run a new power wire to your horn leave your horns stock ground and just replace the HOTLINE ..
you could even go as far as installing a la cou ca racha horn to bring back that 70's Lowrider feel lol
There should be a fuse panel under the dashboard that is labeled. One should have "horn" on it. If not check under the hood for other fuse panels. If you still cant find it, you can start pulling fuses and checking to see if they are blown or not
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