Re: Whiskey Tango Foxtrot?
More than likely your door latch cable has a broken plastic end on it. This allows too much play in the cable and it won't trip the latch. Ford sells a whole latch assy for big bucks or you can go aftermarket and just replace the broken plastic with new metal ends, like most folks (including me). Check out these ends on ebay .
The replacement procedure can be found on you tube in a bunch of videos. At a minimum, I would suggest doing both upper and lower cables on the bad door so you don't have to go back in there 6 months later for the one you didn't do. The best plan would be to set aside a six pack and an afternoon and do both rear doors, it isn't a hard job and will last for years.