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Alarm going off randomly... Help!

jedwa115 Aug 30, 2006

  1. jedwa115

    jedwa115 Member

    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
  2. madvw

    madvw Active Member

    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.
  3. god_thats_quick

    god_thats_quick Numptie of the highest order

    If you disable the interior sensors I think it will stop the alarm going off, it's the button on the drivers door pillar.
  4. jedwa115

    jedwa115 Member

    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.
  5. AndyMac

    AndyMac Moderator Staff Member Moderator

    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.
  6. SyA3Turbo

    SyA3Turbo Member

    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!

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