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intermittent alarm issue?

AndyC555 Oct 29, 2020

  1. AndyC555

    AndyC555 Registered User

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    Hello,

    What would cause the car alarm to go off intermittently for no reason? At first I thought it may have been a genuine trigger by suspicious activity so I thought nothing of it. But then it kept happening more often. So I decided to spend a day just sitting out on the drive (it was a nice day LOL ) and nobody is near it and the alarm triggers.

    Battery/voltage issue? No problem starting or any lights on the dash.
     
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  3. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    Could be a bad sensor or a faulty microswitch on one of the doors a diagnostic scan of the car will show why the alarm is being triggered.
     
  4. AndyC555

    AndyC555 Registered User

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    I did a diagnostic scan with my Carista and all it showed was a fault with the adaptive cruise control. This problem I knew about because the camera/radar picks up cars in another lane and brakes even though my lane is completely clear. The system needs to be calibrated. This would hardly trigger the alarm though.
     
  5. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    No idea then, as the reporting sensor that triggers the alarm should then create a fault code. Could be Carista not reading fault codes correctly I've seen that with VCDS before.
     
  6. AndyT306

    AndyT306 Moderator Staff Member Moderator

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    i had something similar on my saloon was a faulty siren
     
  7. ScottyNS

    ScottyNS Registered User

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    Must be a thing going around at the moment as I am currently having this trouble with mine. It's booked to see the local dealer (under warranty) next week - assuming they're still open in the UK. I'll update my post if they tell me the details of what's causing it.
     
  8. B5NUT

    B5NUT Well-Known Member VCDS Map User

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    UK dealers have to close, unless they are allowed to keep the service section open.
     
  9. ScottyNS

    ScottyNS Registered User

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    I'm not holding my breath to be honest. I was surprised not to get a phone call today saying it needs to be rebooked. I will wait and see what happens.
     
  10. elan2s

    elan2s Registered User

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    Service departments can remain open, only showrooms have to close


    Sent from my iPad using Tapatalk
     
  11. DonkeyIce

    DonkeyIce Registered User

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    Mine had the same, was in for a day and they diagnosed a shorted wire in one of the boot systems, and required a new module, thankfully replaced under warranty


    Sent from my iPhone using Tapatalk
     
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  13. Neil Woodburn

    Neil Woodburn Registered User

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    I had an intermittent alarm going off when car ( Avant ) was parked in the drive - especially when it was raining. Dealer adviced it was damp in the lock mechanism when they looked at it - which I thought was strange and a excuse to get shot of the warrantee claim - but after 2 years it has stopped. No idea where the sensor for the tailgate opening is but maybe ......
     
  14. ScottyNS

    ScottyNS Registered User

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    My car has just come back from the dealer and they're applied a software update that was outstanding, so far this appears to have fixed the issue. I also had a defective battery, so that could have had a role to play. Either way, hopefully I won't have anymore 2am wakings!
     

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