Horn want on Steering wheel but work from key pad. Car was in accident. Air bag not deploy.
Check the Horn Relay (in fuse box under the hood). You will need to check for Circuit continuity between the Relay and the horn button. There must be a loose connection under the dashboard or in steering column. Pressing the Horn button Grounds the circuit, so check the circuit from the relay to the horn button for continuity to ground.
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: 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: 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 :(
SOURCE: my question on my 94
disconnect the negative batery terminal be fore you mess with the horn. the cover should come off easily and you will the wire for the horn on my car the wire is green
This is likely due to a defective horn contact under the steering wheel called the clock spring ribbon rotating contact drum. You must disarm the airbag system and remove the steering wheel (requires special tools) to replace the contact.
Testimonial: "Thank you, tools I have, not a problem, I just have not gotten around the how to disarm the air bag. That part is out of my expertise. Is there an easy way to it?"
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