My tailgate is locked and won't unlock with other doors using remote.

 

Can you hear the mechanism trying to work when you lean down next to it?

If you want to try and get to it with the door closed, you can try pulling the interior panels off from the inside -- but you'll probably break something.

Start with the upper center (above the glass) then work your way down the sides. To pull the main panel off, remove the tool kit and the storage net. To get the handle off, there are two plugs under the grip that push some clips outward. Pull them straight out then squeeze the clips before pulling on the handle.

Chip H.