Duh-----------------
I recently replaced my ignition switch after being stranded about 12 miles from home, and then the trunk release woudn't work.

Checked the wiring, relays, fuses, switches, etc, no joy.

I then (finally) got out the owner's manual and read about the remote release. Ah-Ha!! The car has to be in park for the trunk release to work either from the button in the glove box or the remote.

Apparently, that pesky gremlin that helps me work on my car (when I find the sucker, I'm gonna skin him) "adjusted" the switch on the base of the column that keeps it from starting in gear and turns on the back up lights.
The car didn't know it was in park!!
After I readjusted it, the back up lights work and the trunk release works.
Success!!
Y'all might try adjusting the switch, called the neutral safety switch, to see if that helps your issues with the trunk release.
Ya know, I looked under the seats, in the trunk, in the glove box aand never did find that dadgum gremlin but I'm sure he's still in the car somewwhere. cwm3