[cmyk]

Can you check to verify whether the fuse itself is getting power at the junction box? If you have a voltmeter, just take the fuse out, touch one lead to a ground/chassis and stick the other one inside the #30 (IIRC, or maybe it's #8) fuse terminals.

I had the same problem and BMW ended up replacing the junction box (luckily under warranty -- otherwise I probably would have just lived without the 12v ports!)