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A4 Cabriolet beeping from rear

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by aa120n, May 10, 2010.

  1. aa120n
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    aa120n New Member

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    [May 10, 2010]
    once a week, my a4 cab 2.5 tdi starts beeping from the rear of the car, ive searched high and low for where its coming from but i cant find it. :wacko: I've read that it could be the alarm siren that needs replacing, but i can't find it anywhere, can anyone please shed some light on this for me?

    Thanks
    #1
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  3. Woorlord
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    Woorlord shifting to Hyperspace... . VCDS Map User

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    [May 10, 2010]
    Backup rechargeable batteries in the Alarm are drained & dead and Audi can only replace the whole unit at ~£100 parts + Labour. A similar thread says £250 at Audi.
    >>Similar Thread Here<< and >>DIY Battery Repair Here<<

    Not familiar where the Siren Unit is on the Cabriolet so you may need an extra pointer on that.
    #2
  4. itsmeagain
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    itsmeagain 1.8T Sport Cabriolet

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    [May 13, 2010]
    If its your alarm siren. A replacement is approximately £80 from a main dealer, I recently purchased one for my TT. Its really easy to fit wouldn't bother getting Audi to fit.
    #3
  5. jolly14
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    jolly14 Member

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    [May 13, 2010]
    #4
  6. dans3.0
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    dans3.0 Member

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    [May 13, 2010]
    Hi,

    Have replaced mine, its really easy to do yourself, the siren is in the hood well on the drivers side behind the trim, all you do is open the hood partway until the lid and hood frame are out the way, unclip the trim one bolt change siren and its done.

    Dan
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    A4cab-Izzy likes this.
  7. jolly14
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    jolly14 Member

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    [May 13, 2010]
    #6
  8. ligand
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    ligand New Member

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    [Jul 17, 2010]
    Thanks dans3.0 I spent the first part of the morning rooting around in the boot until I found your post. Sadly my batteries leaked and the siren's circuit board is fried! :(
    #7
  9. scott b
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    scott b Active Member VCDS Map User

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    [Jul 18, 2010]
    hence why when i fitted the rear park sensors on mine i didnt bother taking the bumper of
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  10. whitty
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    whitty Member

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    [Aug 24, 2010]
    I have a similar problem except my siren does not emit any niose at all.
    I am so glad you told me where the siren is though ...... i have been searching under wheel arches and in boot all afternoon. LOL
    As its now peeing it down i will sort it 2moro now.
    Did you replace the circuit board, if so how many pennies was it.
    Thanks guys.
    #9
  11. DWH
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    DWH Member

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    [Aug 22, 2014]
    Hi. Decided to re-open this old thread as it seems most appropriate to my problem.
    It's a 2003 1.8T Cab and the alarm siren now goes off quite regularly when the car is locked. It keeps going when the car is unlocked and even for the first bit of driving. It sounds for about 30 seconds (seems like a lot longer) then off for 10 seconds then starts again.
    Stops after a few minutes driving. Could the weak main car battery be causing the siren battery to discharge or struggle to maintain a charge ?
    Can the siren battery be replaced or is it a whole new siren unit ? Does anyone have a part number for siren unit or battery and as an aside, what is the best capacity main car battery that will fit into an A4 Cab ?
    Thanks
    David
    #10

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