We're experiencing the dreaded random alarm triggerings on my wife's car,  Can't detect a pattern to the triggerings except that it hasn't happened whilst in motion - yet.

Normal reset methods work on occasions but not on others, and finally shutting the thing up usually occurs after several ignition on/off and engine on/run/off cycles.

I've removed the internal sensor as a triogger using the isolation button down on the B pillar - no discernable difference.

Car battery is healthy and around 3 years old.

I'm assuming at this point that the problem will be the alarm battery, either failing or rotting and coroding the circuit board.  I've had a quick look on aliexpress and the going rate for a new alarm seems to be arouns 50 squid.

 

I'll run a VCDS scan later when I can get back to my diagnostic kit but in the meantime am wondering of there's any way to disable the alarm unit for now?  I've tried searching Ross Tech's site for a way but nothing so far.

 

Have you tried dusting in/around the area of the internal proximity sensors - above the drivers head in the middle.  There are some plastic grills in there in the headliner between driver and passenger.....a GENTLE hoover will hopefully resolve your issue.