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  1. #1
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    Extra Alarm Siren

    Extra alam siren
    Can you add a additional siren to the factory fitted siren.
    The factory fitted unit on my a4 cab is not loud enough, i bought an after market battery back up siren unit and wanted to know how or if you can add an extra unit without causing problems with the factory unit.
    The new unit only has 3 wires, positive, negative and trigger.
    Any help would be great

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  3. #2
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    you could wire air horns up if you want it super loud

  4. #3
    Woorlord's Avatar
    shifting to Hyperspace... .

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    The Audi Siren uses 3 wires 1.=+12v, 2.=0v, 3.=Communications with Convenience module.
    You would need to break open the Audi Siren and find the trigger signal for the actual siren circuitry and then buffer that and feed it to your additional siren - not impossible but not the easiest of jobs.
    2001 A4 Saloon 3.0 Quattro Sport Tiptronic - Platinum Leather/Heated Front Seats/BOSE/DIS/Cruise Control
    Retrofits:GmBH Bumpers, F&R Ambient LEDS, OEM Valeo Xenons (D2S) & Headlight Washers, Auto-dipping RVM, Footwell Lights, Vent Control illumination, ISO-Fix, RNS-E & OEM Bluetooth + VIMhack + Video i-pod & Aux inputs, Rear PDC, Powerflow 100mm Tips, Reversing Camera
    2012 A4 Saloon 2.0 TDIe Technik (163ps)
    Diagnostics:VCDS HEX+USB+CAN Cable

  5. #4
    PetrolDave's Avatar
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    Quote Originally Posted by Woorlord View Post
    The Audi Siren uses 3 wires 1.=+12v, 2.=0v, 3.=Communications with Convenience module.
    You would need to break open the Audi Siren and find the trigger signal for the actual siren circuitry and then buffer that and feed it to your additional siren - not impossible but not the easiest of jobs.
    +1

    This question has been asked many times over the years, and AFAIK nobody has posted that they've achieved it.
    2006 RS4 Avant (Phantom Black), RNS-E (2010 version inc SDS, HW 070, SW 0220) with AMI (250GB hard disk), Bluetooth + iPhone 5

  6. #5
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    if its hard work to get wired why not buy a cheap aftermarket alarm and wire that in

  7. #6
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    Cheers......................

  8. #7
    a4 cabrio's Avatar
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    could someone please tell me how to test the alarm to make sure all is ok with it
    2005 Audi A4 Cabriolet 2.5 V6 TDI S Line 163BHP
    Now Remapped to 195BHP

  9. #8
    "Stick a V8 in it!"

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    Move the siern to the engine bay.

    Will be much louder then, than being trapped in a tiny cubby hole in the corner of the interior.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


 

 

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