seems simple enough, ok.. so i have the doors that arent full doors, you have to have the front doors open to open the back door.. on one side , you can open the door from the inside or from the handle that is exposed when front door is open... ok on the other side, the door handle on the inside does not work,, so i looked and when you open the door from inside on side that works it also moves the center handle,, the broken side does not.... so could it just need tightened up or is it a thing that is broke and its broke ?

 

Pull the door panel off, and have a look. Get the right tool for the clips that hold it on though, they break easily, (off the door panel) and then it won't stay on right.