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Alarm Horn Issue

Aidy06 Jul 15, 2013

  1. Aidy06

    Aidy06 Member VCDS Map User

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    Hi, upon scanning my car with VCDS I've found this fault...

    01134 - Alarm Horn (H12)

    Checked fuses and they all seem fine, checked alarm horn via output test in VCDS and no sound. I've enabled the chirp when I lock and unlock my car but they're really low volume, you can only just hear them so I'm guessing this is tied in with this fault. Question is has anybody had this problem before and managed to solve it? I know I'm looking at replacing the alarm horn but where is it and how easy/hard is it to change?

    Thanks
     
  2. Artimus

    Artimus Shortback

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    Hi mate! the Alarm horn is behind the O\S wheel arch liner - so it does seem a little quiet at the best of times.

    Have you tripped the Alarm (set with window down and wave arm inside after 1 minute) to see if it actually sounds?
     
  3. Aidy06

    Aidy06 Member VCDS Map User

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    Hi, thanks for the reply. Yes I have tried that and the alarm does not sound at all, I've done a few tests and I can't get the alarm to sound. Thinking it will need replacing but wouldn't know where to start
     
  4. Patrick_c99

    Patrick_c99 Member

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    Connect it to your horn through a relay and diode and then youl be able it hear it if it ever goes off
     
  5. Artimus

    Artimus Shortback

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    Does that work with this car?

    Did a similar mod on a previous car, but IIRC there was a post last year that claimed it wasn't possible on the A3??? :sos:
     
  6. Aidy06

    Aidy06 Member VCDS Map User

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    Can you repeat that in English please??? Haha
     
  7. Patrick_c99

    Patrick_c99 Member

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    When the alarm is activated it will send a signal which used to go to the old beeper. Say that signal is only 5v. which isnt really enough for the horn. But if you send it to a relay it will act like a on off switch from the 12v from the battery direct to the horn.

    And the diode will only allow the current to flow in 1 direction so when you press the horn under normal driving it will stop any from traveling back up the system.
     
    Aidy06 likes this.
  8. Aidy06

    Aidy06 Member VCDS Map User

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    Hmm, sounds interesting. Maybe something to look into if the actual alarm horn is to much hassle sorting out
     
  9. Patrick_c99

    Patrick_c99 Member

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    Well either way you have to access the rear panel to get to the signal wire. But with the horn at least youl be able to here it. I used to park my car under my bedroom window and someone hit it one night and even with my windows open I still didn't wake up.
     
  10. shariain

    shariain Well-Known Member

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    http://bit.ly/146fWVx

    The second one down is what will be wrong with your h12 alarm horn. And like others have said its behind the drivers wheel arch in a security box which is riveted to the body.
     
  11. Aidy06

    Aidy06 Member VCDS Map User

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    Looks like I'll be staying with no alarm then, wouldn't fancy taking that job on to be honest
     
  12. Patrick_c99

    Patrick_c99 Member

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    Ind the wire in the engine bay that leads to it and cut it lol
     
  13. Patrick_c99

    Patrick_c99 Member

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    Actually don't. It may go off
     

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