[PJ-Paul]

Just bought a car a few weeks ago and alarm randomly started to go off.
Can't find any reason why, presumably it happens more frequently when scheduled charging starts or car charges, but that's not 100%.
12v battery is new AGM one. I've already removed all fuses with "horn" markings, however no difference.

Does anyone know how to disable the alarm system completely? Leaving door open overnight is no longer an option due to the rain.

 

[DBMandrake]

The most common cause for false triggering of alarms is ultrasonic movement sensors. Try disabling the movement sensor before locking the car using the button on the ceiling to see if that makes a difference.

 

[MKW]

I had a similar random alarm problem with a Prius. Turned out to be sunglasses in the holder! Sounds odd but since moving them not a problem.