Question about 1992 Toyota Previa
When press horn plate there is no sound at all
Bad horn switch or ground to it
blow fuse, (check this 1st)
bad horn relay if fitted
bad horn ground
Posted on Feb 21, 2014
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Posted on Jan 02, 2017
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
Posted on Jan 16, 2009
SOURCE: 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.
Posted on Feb 08, 2009
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.
Posted on Mar 24, 2009
It may be the same horn, depends on the type of alarm you have. Does it sound the same???Disconnect the horn and jump the horn with 12V If it doesn't work then it is the horn. If it does than it is the switch or wiring.
Posted on Sep 01, 2009
SOURCE: The horn not workingI
The metal plate in reference above has small copper contacts. If they do not meet the horn will not work. We used a dremel on ALL of the contact point and it made no difference, the horn still only works about 5% of the time. After a whole lot of testing (I have the same issue with my 2000 Toyota Sienna) we found that the ground is weak, too weak for the relay most times. At this point I am going to run an alternate ground by "borrowing" the wire for the mute button for audio controls through the clock spring. The existing ground connects to the steering column. Before we discovered this I spent $285 on a new clock spring :(
Posted on Mar 25, 2010
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