my 2017 elantra rear passenger door would not open ftom the outside or inside. Here was the fix. Take a small thin pry tool and pry up on the manual lock and pop it out. Mine did not break it just popped out. On yop of door handle you will see a pin. Pull the pin up and out and the door handle will come out. Look inside the and you will see the handle cable. Pull with a pair of needle nose plyers and it will unlock the door. As long as you dont auto lock the door you can open the from the outside. If you auto lock you will have to pull on the cable again to unlock. Then remove your door panel. Remove one screw down inside in the arm rest. Then remove the door panel. Unplug the lower plug and your panel is off. To this point took me 20 minutes. Now the problem with door not unlocking was the actuator. It is located at the end of door where it latches. You will have to remove the inside panel to get to that. Remove and replace. Then install everything back. You take the entire latch housing off (5 screws) to put the manual lock and door latch back in place before you put the panel back on. About an hour and a half for the entire process. Got the new actuator on Ebay for 130.00. Dealer cost for the job will run atound 1200.00. It wasnt hard to do and look what you will save. The dealer actually told me it would take 3 hours just to get the door open. I can tell you that wasnt true.