Stop alarm sounding when battery is disconnected

[toff]

I leave my camper van parked-up for a month a time.

In the freezing cold weather, there isn't quite enough juice to start it when I return to it.
I repalced the lead-acid battery with a new AGM battery but still get the problem (almost enough power to start the engine but not quite enough I'm guessing there's a power drain somewhere).


I bought a decent quality battery disconnect with the aim of disconnecting the battery and locking the van with the key only... that all works fine but when I go to unlock the van (with the key) the alarm goes off (the alarm has a battery backup).

The problem is; I always collect the van very late at night (2am) and it's parked right infront of a row of houses (rented parking space).

Is the only option to pull certain fuses instead, so the majority of equipment is disconnected but the alarm still gets power?

Cheers
Al

[Crasher]

You can disable the siren with a diagnostic system such as VCDS.

[toff]

Thank you

[toff]

Hi Crasher, do you have any details disabling the siren please... any guidance as to which module / value to change please?

[Crasher]

Which diagnostic system do you have?