I have a 2006 chevy impala, with electric door locks. I just found out I can't open the left rear door from the outside or the inside. When I unlock the doors all of the door lock buttons go to the open position and all of the other doors I can open using either handle. I'M not sure how to work on this being that I can't open the door to get the panel off.
Start by removing the inside door handle
Remove the screws that retain the inside handle bezel (1) to the door.
Pull in order to disengage the clips (2) and remove the inside handle bezel (1).
Remove the garnish molding. Refer to Garnish Molding Replacement - Sliding Door in Interior Trim.
Use J 38778 in order to release the trim panel retainers.
Remove the sliding door trim panel.