I've got a new twist on what may be an old problem... My alarm started going off by itself shortly after I installed my new Pioneer AVIC X920BT. I've done some searching on this forum and have read that the alarm is prone to RFI from microwaves. Is it a coincidence that my alarm has gone off when I've forgotten my iPhone in my armrest compartment? I wired the stereo so the iPhone goes in the armrest- I haven't given it a real test yet, but I'm thinking that if I leave the phone in the car and set the alarm, the phone might be setting off the alarm. Does anyone know if there is an alarm sensor tied to the CDR24 that I should disable if I remove the OEM radio? I don't have any other ideas unless I have a bad sensor as some others have mentioned on the site.