I have a 2012 750 Li that had given me the Charge Battery notification for a about a week. When I left work at 5 am the alarm was going off. The alarm sounded again when I parked at home about 45 minutes later. It went off during morning while I was asleep. I read that a low battery could cause that. I changed the battery (it has not been coded yet, but was told by a mechanic that would not create my current problem). The alarm siren still goes off at random, even when driving. I took a sick day from work to turn around and come home to work on it. The siren was silent for about 2 hours, then sounded again. I disconnected the battery and it was still sounding. Is there a wire I can disconnect to the siren?