Hi guys, just want to share my "experience", this may or may not do any good in your situation...
Mine is '96 4 door w/power locks.
So when I've got the jeep both rear doors were dead-locked, can't open neither from inside neither from outside.
Finally one day I've decided to try to deal with this.
In my situation there was also a complication, as both rear doors "child safety" tubs were engaged ("ON" position), so the inside handles were "disabled". If I press the outside handle button, it goes all the way in, but the door would not open.
So I had no choice, but take the doors' panel off, thankfully it was actually possible while the doors were closed, but it's pita
You may not need to do so, if you can open the door from inside.
So, in my case, I took the panel off so I had access to that "hole" behind the locker mechanism. I rolled down the window, so I could reach outside and press the button, while with flashlight illuminating the inside of the hole and watching what the hell is going on there. It's kind of hard to see much, but you should see a "piece" (link) moving down. From there (also after spraying all the pieces inside with WD-40, as they were very rusty), while pushing the button I managed to reach/grab that "moving down link" and helped it out by pulling it down a bit more and got it open.
After I've got the door open, then I could set the child safety to "OFF" (also was rusted and hard to move), and now I could open the door from the inside. However, as I close the door, again, I still could not open the door from the ouside.
So what I've noticed, by "observing the action", that it seems that "Pushing The Button action" works, but does not "go down enough" to unluck the locker. Then I looked at the side of the door and found that little hole with "adjustment screw" inside. I am not sure what the correct name for it, but if I understand correctly, this is adjustment of "door handle button action" (?).
So, I've looked into that little hole (see attached photo 1), I see there a small Hex screw, and it has some adjustment play. I had to WD-40 that screw too first. Then I unscrewed it a bit so it's movable and pushed it up (actually , all the way up to the max) and tightened it. So in my case this was just enought to get that "missing" extra action-motion from the Button to the locker, and now everything works fine.
You can try this, see if this may make a difference. I'd imagine, there could be different reasons there...the whole mechanism is pretty freaky there
see attached photos, I did my best trying to make shots of that screw, it's hard to find the right camera angle so the screw is visable.