intermittent alarm issue?

[AndyC555]

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.

 

[B5NUT]

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.

 

[AndyC555]

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.

 

[B5NUT]

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.

 

[AndyT306]

i had something similar on my saloon was a faulty siren

 

[ScottyNS]

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.

 

[B5NUT]

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

 

[ScottyNS]

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

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.

 

[elan2s]

Service departments can remain open, only showrooms have to close


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[DonkeyIce]

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


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[Neil Woodburn]

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 ......

 

[ScottyNS]

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!