Car Alarm problem
 

The car alarm on my 9;.3 Tid Saloon has been going off without cause. I have changed the setting to "partial" so only doors are activated Went off again last night./
I would be happy to disarm completely as long as the doors are locked.
Two questions:
1. Can I lock the car without arming the alarm? The manual key doesn't work...
2. If not, how do I stop the alarm . - can I remove a fuse without losing any other function?
Advice would be appreciated.