My alarm went off tonight for a while. It's parked out back, at an angle on a sloping apron - I've parked it there before without any problem, though I prefer the more visible street parking out front. Anyway, I heard the alarm, from the front of the house, and didn't realise it was mine; it stopped after a while, having greatly excited the neighbour's yappy dog.
A couple of hours later, I saw a Whatsapp message from my neighbour, which read 'That's your car'. I'd forgotten about the alarm by then, so my first alarmed reaction was - what? Being towed away? On fire? What? :-o

Then remembered the earlier alarm, so went out to check. No sign of anything amiss, no damage. It's a quiet cul-de-sac, and a cut-through for foot traffic, including the local drug dealers/buyers - so maybe someone was trying to break into it. No idea.
My question is, can I permanently turn off the siren? I've found some instructions on here for temporarily disabling the motion sensor alarm, by hitting the lock button twice - IF that works for my model. But I'd rather immobilise it entirely if possible. My Roomster is 2013, automatic.
Anyone know?

My alarm sounded one afternoon and I unlocked and locked the car. As a precaution I used a vacuum cleaner and used the brush tool and sucked the vents near the interior light switches. Might have sucked out an insect as no more alarm sounding since

Ours did a spurious alarm recently, that we think was actually probably a genuine trigger of the internal monitoring system by one of the roof blinds 'opening itself'.

If yours have a tendency to not always stay shut, the same event may have caused yours. Steeply sloping driveway might increase chances of a blind overcoming the little magnetic latches?

To disable alarm, I believe the best way may be to remove it from the 'installation list' of modules fitted, using VCDS. No physical changes would then be required.

Haven't tried this myself though.