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Discuss Horn doesn't work in the alt.autos.toyota forum at Car Dealer Forums; My horn does not work and we checked all of the obvious, fuses, etc. All ...
  1. #1
    joyewils@gmail.com
    Guest

    Default Horn doesn't work

    My horn does not work and we checked all of the obvious, fuses, etc.
    All good. A mechanic said that because we have air bags the repair
    would be costly and it needed to be done with at an electrical
    repairshop. Can I buy some kind of replacement horn and by-pass the
    old horn and wiring so that I can have a working horn so that we can
    pass inspection? Thanks for your help.




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  2. #2
    =?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?=
    Guest

    Default Re: Horn doesn't work

    On Wed, 28 Mar 2007 07:56:05 -0700, joyewils@gmail.com wrote:

    > My horn does not work and we checked all of the obvious, fuses, etc. All
    > good. A mechanic said that because we have air bags the repair would be
    > costly and it needed to be done with at an electrical repairshop. Can I
    > buy some kind of replacement horn and by-pass the old horn and wiring so
    > that I can have a working horn so that we can pass inspection? Thanks for
    > your help.



    Well, yeah, you can, if that's the problem.

    Here's an easy way to check: remove the horn from the car, connect some
    wires to the termonals on the horn, and touch the wires to the battery. If
    either horn blows (there should be two) then the horns are not the problem.
    Note...wear hearing protection, or at least turn the horns away from you,
    or you'll be saying "WHAT?!?!" for a week.

    And, make sure there are as many cats as close by as possible!



  3. #3
    Jeff Strickland
    Guest

    Default Re: Horn doesn't work

    I don't have the same inspection you have, but I seriously doubt that you
    can pass if the horn button (activation mechanism) is not on the steering
    wheel.

    You can disconnect the battery -- the ground terminal is fine -- and then
    remove the airbag. My guess is that the horn contact on the back of the
    steering wheel has failed (worn out). Normally, the contact will work
    intermittently for a long time before it fails. You can attempt to operate
    the horn while turning the wheel to different positions and see if the horn
    is completely gone, or only gone in some spots. This will give yo an idea of
    how many parts you might need.

    Of course, BEFORE you do any of this, you should find out if you have
    voltage at the horns, or not.

    If you remove the airbag -- remember to disconnect the battery first -- then
    attempt to start the car, or simply set the ignition switch ot ON, this will
    trigger an Airbag Fault that can only be reset by somebody with the proper
    diagnostic scanner. An airbag fault is considered by the computer to be a
    fatal error, and service must be performed by a qualified technician before
    the error can be reset. Obviously, if you power up the system with a bag
    removed, this will appear to the computer as an error. You should be able to
    explain to a repair shop that you had the bag out of the car, and the
    ignition was switched ON, and therefore no further service is required. The
    diagnostic scanner will confirm that story, and the error can be cleared.






    <joyewils@gmail.com> wrote in message
    news:1175093765.786225.59090@l77g2000hsb.googlegro ups.com...
    > My horn does not work and we checked all of the obvious, fuses, etc.
    > All good. A mechanic said that because we have air bags the repair
    > would be costly and it needed to be done with at an electrical
    > repairshop. Can I buy some kind of replacement horn and by-pass the
    > old horn and wiring so that I can have a working horn so that we can
    > pass inspection? Thanks for your help.
    >



  4. #4
    Ray O
    Guest

    Default Re: Horn doesn't work


    <joyewils@gmail.com> wrote in message
    news:1175093765.786225.59090@l77g2000hsb.googlegro ups.com...
    > My horn does not work and we checked all of the obvious, fuses, etc.
    > All good. A mechanic said that because we have air bags the repair
    > would be costly and it needed to be done with at an electrical
    > repairshop. Can I buy some kind of replacement horn and by-pass the
    > old horn and wiring so that I can have a working horn so that we can
    > pass inspection? Thanks for your help.
    >


    I would find a competent automotive technician who knows something about
    cars. Diagnosing an inoperative horn is very simple, especially for a
    competent technician.

    The first thing to check when a horn does not work is to see if there is
    voltage at the horn(s). Some cars have one horn, some have two. The best
    way to check for voltage at the horn(s) is with a volt meter (can be had for
    under $35 at Radio Shack), the next best way is with a 12 volt test light
    (can be had for under $15 at an auto parts store). If there is voltage at
    the horn(s), then there is no need to check fuses, horn relays, or the horn
    switch itself because power is getting to the horn. If there is voltage at
    the horn, then the horn is bad, which is the most likely scenario. If there
    is no voltage at the horn, then work backwards through the circuit to the
    power supply.
    --

    Ray O
    (correct punctuation to reply)



  5. #5
    Ray O
    Guest

    Default Re: Horn doesn't work


    "Jeff Strickland" <crwlr@verizon.net> wrote in message
    news:C_vOh.21486$Ht2.1637@trnddc06...
    >I don't have the same inspection you have, but I seriously doubt that you
    >can pass if the horn button (activation mechanism) is not on the steering
    >wheel.
    >


    I recall some early '70s British cars with the horn activated by a stalk on
    the steering column.

    > You can disconnect the battery -- the ground terminal is fine -- and then
    > remove the airbag. My guess is that the horn contact on the back of the
    > steering wheel has failed (worn out). Normally, the contact will work
    > intermittently for a long time before it fails. You can attempt to operate
    > the horn while turning the wheel to different positions and see if the
    > horn is completely gone, or only gone in some spots. This will give yo an
    > idea of how many parts you might need.


    I would be very surprised if the horn is gone only in some positions when
    turning the steering wheel. I believe that Toyotas with air bags just have
    a switch, which is connected to a spiral wire along with the airbag and
    cruise control wiring.
    >
    > Of course, BEFORE you do any of this, you should find out if you have
    > voltage at the horns, or not.
    >


    Reminds me of an episode of *M*A*S*H* where they are trying to disarm a
    bomb, and the instructions say "cut the red wire" so they snip the red wire,
    and the next step is "but first, cut the blue wire"

    BTW, air bags remain energized for a while after the battery is disconnected
    so include a one minute wait after disconnecting the battery before messing
    with any air bag. It is not necessary to turn the key to the on position to
    check the horn, so I would not recommend giving that advice and setting a
    trouble code when it is not necessary.

    --

    Ray O
    (correct punctuation to reply)




  6. #6
    Jeff Strickland
    Guest

    Default Re: Horn doesn't work


    "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
    news:b5bac$460a9241$44a4a10d$11562@msgid.meganewss ervers.com...
    >
    > BTW, air bags remain energized for a while after the battery is
    > disconnected so include a one minute wait after disconnecting the battery
    > before messing with any air bag. It is not necessary to turn the key to
    > the on position to check the horn, so I would not recommend giving that
    > advice and setting a trouble code when it is not necessary.
    >




    I am not sure that Toyota requires the ignition to be ON or not to power the
    horn circuit. I did not intend to give advise that the key be switched ON, I
    meant to give advise that if the key was switched ON, then a a fault would
    be stored.

    If it is not necessary to switch the ignition ON to test the horn, then the
    issue is moot because the fault will not be triggered during a horn test.
    The fault could be set if the vehicle is used to make a parts run while in a
    state is partial disassembly -- so covering the point is probably a good
    idea.






  7. #7
    Ray O
    Guest

    Default Re: Horn doesn't work


    "Jeff Strickland" <crwlr@verizon.net> wrote in message
    news:EuROh.5500$8l2.3234@trnddc01...
    >
    > "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
    > news:b5bac$460a9241$44a4a10d$11562@msgid.meganewss ervers.com...
    >>
    >> BTW, air bags remain energized for a while after the battery is
    >> disconnected so include a one minute wait after disconnecting the battery
    >> before messing with any air bag. It is not necessary to turn the key to
    >> the on position to check the horn, so I would not recommend giving that
    >> advice and setting a trouble code when it is not necessary.
    >>

    >
    >
    >
    > I am not sure that Toyota requires the ignition to be ON or not to power
    > the horn circuit. I did not intend to give advise that the key be switched
    > ON, I meant to give advise that if the key was switched ON, then a a fault
    > would be stored.


    On all Toyotas, the horn circuit is live all the time.


    --

    Ray O
    (correct punctuation to reply)



  8. #8
    =?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?=
    Guest

    Default Re: Horn doesn't work

    On Thu, 29 Mar 2007 16:07:00 +0000, Jeff Strickland wrote:

    >
    > "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
    > news:b5bac$460a9241$44a4a10d$11562@msgid.meganewss ervers.com...
    >>
    >> BTW, air bags remain energized for a while after the battery is
    >> disconnected so include a one minute wait after disconnecting the
    >> battery before messing with any air bag. It is not necessary to turn
    >> the key to the on position to check the horn, so I would not recommend
    >> giving that advice and setting a trouble code when it is not necessary.
    >>
    >>

    >
    >
    > I am not sure that Toyota requires the ignition to be ON or not to power
    > the horn circuit. I did not intend to give advise that the key be switched
    > ON, I meant to give advise that if the key was switched ON, then a a fault
    > would be stored.
    >
    > If it is not necessary to switch the ignition ON to test the horn, then
    > the issue is moot because the fault will not be triggered during a horn
    > test. The fault could be set if the vehicle is used to make a parts run
    > while in a state is partial disassembly -- so covering the point is
    > probably a good idea.



    The horm ckt is on all the time. Better than European cars! I was sitting
    in my Volvo one time just getting out, and someone almost backed into it.
    With the keys in my hand, I had NO HORN!! They stopped about 1/4 inch from
    the damn car!!!!



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