My driver's side power lock button will always lock all four doors, but when I try to unlock the doors, the rear passenger side door will not unlock 95% of the time. Sometime, I can get this door unlocked by hitting the button several times. This seems to work the best when all 4 doors are closed. Would anyone please tell how to fix this? Thank you.

 

I to am having that problem. I have the wiring diagrams for the locks and i think its the switches that have gone out in both of our cases. I am going to find the switch and replace it and see if that fixes the problem. Good luck to you.

 

Same thing happened to me, it is the switch. I think cost is around $45, not sure, mine was under warranty at the time. Replace it and you should be good to go.