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Horns not working,original relay 43yrs old !

Able to get horns to work at one point , from steering wheel & manually at relay,now i have clicking noise at horns but no sound & when i try to assemble steering wheel to adapter my cab light goes dim. please help.p.s i cleaned contact on relay,also is the horn wire to steering suppose to be hot ? THANKS AGAIN ,TJ

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  • Cars & Trucks Master
  • 5,317 Answers

You hear clicking at horns, and not the relay? Maybe the horns went bad, or maybe you need to check and clean the connections there.
Don\'t know why the cab light went dim, unless the horn wire was trying to make contact?
Yes, TJ, the horn wire should be hot. You are grounding that hot wire when you press for the horn. That hot wire comes from the coil side of the horn relay. Press for horn, it grounds the coil side of relay, and the relay can pass power to the horns.
Now back to the clicking no-honker horns: power gets to the horns when relay is energized, and there has to be a good ground for horns to work. I don\'t know if your horns are case grounded or a wire from horns goes to ground, but check the ground there. If case grounded, pull horns off and clean the ground. Also might try a known good horn. Keep at it, sounds like you are almost there.

Posted on Dec 30, 2012

  • 2 more comments 
  • TJ Var Dec 30, 2012

    i by passed relay with hot & both new horns work fine, they were working at one time from steering wheel & manually down at relay when i used my finger to make contact, now i have nothing ! should i replace the 43yr old relay ?

  • montehammons Dec 31, 2012

    Yes, I would try that.

  • TJ Var Dec 31, 2012

    when touching that horn wire at steering column,it is dim on my test light at this end at relay! not as bright when i touch hot going to relay,is the correct ? i cleaned contact at relay & bypassed hors they work fine,again the relay is 43yrs old ! should i replace ? thanks again!! i appreciate any & all help from all of you! TJ Have a HAPPY NEW YEAR TO ALL :-)

  • montehammons Dec 31, 2012

    THX. Yes, replace it. Should be battery voltage, i think.

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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.

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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 +
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you could even go as far as installing a la cou ca racha horn to bring back that 70's Lowrider feel lol

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Where is the horn relay located on a 2007 ford edge sel


It is located in the SJB - smart junction box an it is a non- serviceable part . soldered to the board inside . Where do you hear the clicking noise coming from ? The SJB is located behind the left side kick panel .
SECTION 413-06: Horn 2007 Edge/MKX Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 10/30/2006 Horn The horn system consists of the following components:
  • Horn switches (part of the steering wheel)
  • Clockspring
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For removal and installation of the steering wheel, refer to Section 211-04 .
For removal and installation of the SJB, refer to Section 419-10 .
Principles of Operation
The smart junction box (SJB) supplies the control and switched voltage to the horn relay (part of the SJB). When the horn switches (part of the steering wheel) are pressed, ground is supplied through the clockspring to the horn relay. The horn relay is then energized directing voltage to the horn and enabling the horn to sound. When the vehicle security system is armed, the SJB provides a momentary ground to the horn relay control side to indicate the system is armed, and an on and off ground when an intrusion is detected or the panic alarm is activated.
If your horns are not working ,you have a wiring problem or the clock spring is open . If the relay is bad the whole SJB has to be replace an the dealer would have to do that . Needs to be programmed ,with factory tool .
Symptom Chart Condition Possible Sources Action
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sscullys_156.jpg

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