I've got a 2006 V50 with 130,000 miles. The "alarm service system required" message has started coming on at startup. I replaced the siren several years ago when this happened and everything worked great until recently. This time I noticed the battery would be drained after sitting overnight. I pulled the fuse on the siren control module and this has stopped the battery drain. I assumed the battery in the siren was bad and this was causing the drain when the car was turned off. Today I pulled the siren and opened it up. I checked the battery just to make sure it was the problem and it's showing 4.8 volts of output. So now I'm wondering what the problem is and how to diagnose it. Is there a way to check if there's something else wrong with the siren besides the battery? Is there any harm in just pulling the fuse and disabling the siren control module? I don't need the alarm and turning off the notification after start up is no big deal. I just didn't know if it would cause trouble down the line, since so much of the electronics seem to be interconnected on these cars. Thanks for any help.