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Alarm going off randomly... Help!

Discussion in 'A3/S3 Forum (8L Chassis)' started by jedwa115, Aug 30, 2006.

  1. jedwa115
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    jedwa115 Member

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    [Aug 30, 2006]
    I've got what seems to be the same problem as a lot of people - the alarm on my S3 goes off randomly and the only way to stop it happening some days is to leave the car unlocked. Have read a few threads and seems that this is prob a problem with lock sensors or batteries in the boot.

    My Q's are:

    1. Will a diagnostics check tell me anything categorically or will I still be guessing after paying for it to be plugged in?

    2. Am I right that there is no way to lock the car without alarming it?

    Cheers, Jon
    #1
  2. madvw
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    madvw Active Member

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    [Aug 30, 2006]
    All you will be able to tell from scanning fault codes is how the alarm was triggered. This will be useful in identifying which door or boot latch/lock needs replacing.

    However, it won't tell you if the siren battery is duff.
    #2
  3. god_thats_quick
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    god_thats_quick Numptie of the highest order

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    [Aug 30, 2006]
    If you disable the interior sensors I think it will stop the alarm going off, it's the button on the drivers door pillar.
    #3
  4. jedwa115
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    jedwa115 Member

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    [Aug 30, 2006]
    No good. That's the first thing I tried. Makes no difference.

    As I type, it's been about an hour without going off. That's after "properly" shutting (read "slamming"!) all doors and bonnet. Had the same prob a few weeks back and that seemed to stop it then.

    Seems I'll need to have the fault codes checked and then I know which door to have a look at.
    #4
  5. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [Aug 30, 2006]
    Disconnect the battery and lock it manually.
    Had this on my old A3 and it was always on cold nights at 3am, so I put it down to the battery backup issue.
    #5
  6. SyA3Turbo
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    SyA3Turbo Member

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    [Aug 30, 2006]
    Its the siren thats the problem. I had my alarm going off randomly. Then it got broken into and didnt sound.

    Fitting a new unit in the boot has sorted it though!
    #6

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