First try pulling fuse 26 in the engine box, then replace it with a new fuse.
If that doesn't work here is a quote from the thread exparamedic posted:
"Okay this is how it is done my Padawans-

remove rear plastic lower panel there will be 1 screw that needs to be removed, that is located where the rear hatch handle is-

slowly pull off the panel , it has 6 clips to hold in place - but comes off nice-

There is a small open area on the Left hand side of the latch (Upper Left)
press down with a flat head screw driver-

you will feel the trunk release and that's it-
However i am still unable to get the device to completely unlock, so when i shut my trunk again it locks, but i was able to get it to open

If your slim you should fit fine, If your a Big Guy you might sweat a little."

I took the leisure of correcting his spelling and punctuation. LOL