HOW TO FIX THE HORN ON A TOYOTA ECHO. HORN WORKS WHEN HOOKED TO THE BATTERY BUT NOT FROM THE STEERING WHEEL
The problem is one of three possibles:
If you press the horn button and know where the horn relay is, you can listen for it to activate. If it does, then either the relay's output contacts are bad or the wiring between the relay and horn is faulty. If the relay doesn't activate, test for voltage at the relay coil with an multimeter in the relay socket. If there is voltage there when the horn button is pressed, then the relay is bad. If there is no voltage there, the the horn button or associated wiring is faulty.
SOURCE: 2000 toyota echo, wheel bearings
I found this site to be very helpful with this job: http://www.toyotanation.com/forum/showthread.php?s=714b28cb1c3f77f992209de0bdbfbd13&p=2481776#post2481776
SOURCE: 1999 toyota corolla Horn doesn't work.
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.
SOURCE: My 99 Toyota Avalon horn does not make any sound.
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
SOURCE: Would appreciate help for a Toyota Corolla 2007 non-working horn.
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.
SOURCE: 98 Toyota 4Runner Horn malfunction
have you cheked if the horn itself is well grounded, it could be that the screw hoding is lose.
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