My tip, other than googling it, is bring the car to the wreckers and park it beside one there, and take their door apart to see what's going on and then you can buy whatever you break fixing your door...
My tracker rear hatch stuck closed, and even after removing the panel from the inside, I still couldn't see why it didn't work.
Then I went to the wreckers and looked at theirs, still couldn't figure out why my door latch wasn't opening(everything visible moved the same)...
So I just bought the whole wrecker door for $60, went home and 5 minutes with the angle grinder had my door open, then just swapped the lock and put on the wrecker door.