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  1. #1
    Established Member Two Rings
    Join Date
    Oct 02 2015
    AZ Member #
    359427
    Location
    Outskirts of civilization

    Using the main horn for alarm instead of the dedicated alarm horn in the back?

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    My alarm horn module died, just as it did for many other B6 owners - damaged by leaked batteries inside the module. I've tried cleaning and repairing the module - it starts working for some people after cleaning - but I wasn't as lucky. So I wonder: is it possible to make the alarm use the main horn instead? I do believe some B6 variants did not have a dedicated horn module with backup battery power. But then, it's possible that those variants had no alarm whatsoever, I can't find any further details on this topic.

  2. #2
    Veteran Member Three Rings
    Join Date
    Jul 03 2010
    AZ Member #
    61005
    My Garage
    1988 Merkur XR4Ti, 1986 911 Coupe, 1991 Alfa Romeo 164
    Location
    New York

    Interesting idea. I replaced my siren module a couple years ago, but then when the new one started flaking out I just disconnected it. I wouldn't mind having it hooked up to the horn. I realize that's not as secure as an independent siren, but it's better than what I have right now.

    I wonder if that's what the '98 - '05 Passat uses? A couple times at the junkyard I've gone searching in the RR corner of Passats for a siren, only to find nothing. If the Passat uses the horn, with otherwise the same setup, we should be able to copy what they did there.
    Brad 2002 Quattro 1.8T w/ 2.8 B5 5-speed

  3. #3
    Veteran Member Four Rings Nollywood's Avatar
    Join Date
    Nov 03 2011
    AZ Member #
    83391
    My Garage
    B6 Avant 420-R, Toyota Runx 1.4 16V
    Location
    Manitoba, Canada.

    Using a regular horn for the alarm will be a nuisance, due to the much higher decibel level.

    Just imagine a windy night, or over-sensitive alarms on 4 cars. Those going off after midnight would cause distress and frustration for residents.

    In Germany, there are strict dB levels, that must be maintained. Traditional alarm sirens were replaced with low-tone beepers many years as a result. Any car imported into Germany will need a louder than normal alarm horn modified to comply with local regulations.
    His:
    B7 420-R Avant - RS6 4.2 BiTurbo, (BCY). B7/8.5 Hybrid "RS4" OEM Widebody Coming Soon.

    Waiting To Purchase 2012 B7 Seat Exeo ST Sport Tech.

    Hers:
    2002 Toyota Runx, 1.4L DOHC 16V Auto.

  4. #4
    Established Member Two Rings
    Join Date
    Oct 02 2015
    AZ Member #
    359427
    Location
    Outskirts of civilization

    Quote Originally Posted by Nollywood View Post
    Using a regular horn for the alarm will be a nuisance, due to the much higher decibel level.

    Just imagine a windy night, or over-sensitive alarms on 4 cars. Those going off after midnight would cause distress and frustration for residents.

    In Germany, there are strict dB levels, that must be maintained. Traditional alarm sirens were replaced with low-tone beepers many years as a result. Any car imported into Germany will need a louder than normal alarm horn modified to comply with local regulations.
    What you're saying makes sense and I agree with the sentiment, but for my car it's a non-issue. First and foremost, I only have the factory alarm and it never goes off by itself. If it does go off, it's because something happened, and I'll definitely appreciate the higher dB level. Also, I only set the alarm very rarely, when I do indeed want whatever little extra security it grants. Also, the horn won't necessarily be super loud if it's modulated with very short pulses.



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