I also noticed my 12V outlet in the middle (the one next to the usb port) was not working. Front 12V and trunk 12V outlets are working fine.
I checked the manual and they have individual fuse. Front and the trunk outlets have fuse under the drivers seat while the fuse for the middle power outlet is located under the hood. Weird. Anyways, I used one of the spare that was in the fuse box under the hood and now it's working fine.
F.OUTLET1: front 12V outlet, fuse 9
R.OUTLET2: middle 12V outlet under the armrest, fuse 52
R.OUTLET3: trunk 12V outlet, fuse 3
I wonder why this happened... It was working fine with a samsung 12V to 5V usb charger. I bought my car in December 2013.
Question, are these 2nd and 3rd outlets powered until the battery is dead?