battery drain from infotainment system
 

My '06 9-3 has a parasitic draw which seems to be from the Infotainment system. In order to prevent my battery from draining overnight, I have to remove fuse #14 (Infotainment system). The battery itself is new, and I've checked to make sure no interior lights are staying on or anything like that. My question is: How do I go about solving this issue so that I can leave the fuse in and not have my battery drain? I'm hoping to avoid taking the car to a mechanic with a Tech 2. On a possibly related note, the passenger seat belt and airbag lights come on intermittently, despite there being no one sitting in the seat. I seem to remember reading somewhere that there's a connector under the passenger seat for the stereo amp, or something like that. Electrical gremlins have never been my forte, so I'm hoping this might be a simple-ish problem.

Thanks in advance for your help!