Extra Alarm Siren

m.c.

Registered User
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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Woorlord

shifting to Hyperspace... .
VCDS Map User
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.
 

PetrolDave

Registered User
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.
 

a4 cabrio

Registered User
could someone please tell me how to test the alarm to make sure all is ok with it
 

aragorn

"Stick a V8 in it!"
Staff member
Moderator
VCDS Map User
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.
 
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