I have the same problem. I replaced the fuse associated with my door locks (different than other quoted fuse numbers since I'm an August '08 production I received a different fuse layout).
I checked to confirm that the fuse map was correct (ie. i pulled the 5 amp for the fuel door and it turned off, then i pulled the 15 amp driver door and, again, no lock function). I replaced the 15 amp passenger door with a 20 amp and absolutely nothing happened.
Unless someone has a new idea, I'm headed to the stealership for an out of warranty (I'm 4k miles or 78 days out of warranty) door actuator repair - any idea on cost?
Thanks in advance!