Alarm problem - help!

[S3_Graham]

2000 CLK, alarm going off randomly. Apparently it's the siren batteries. Anyone know how to de-activate it? Can you pull a fuse or something? Tried leaving the car unlocked but it just locks itself again? Any way to get round that?

My neighbours hate me.

[S3_Graham]

had the fault codes read, interior sensor seems to be the culprit!