Stereo & Electronics - Driver's side power lock problem

I did a search but couldn't find anything related to this specific problem. JUST my driver's side power lock doesn't work. I don't think it's a fuse because when I press lock/unlock on the remote, the passenger side functions, and same thing when I press the button inside. The only way the driver's side lock moves is when I do it manually. Any ideas? Thanks in advance.

Sounds like the door lock accuator is bad. It is a 2 wire accuator. One is powered and the other is grounded to lock. Reverse polaity to unlock. Take off the door panel and unplug the connector to the accuator. Power one wire and ground the other and see if it works. Then reverse and see if it works. If it does not, the accuator is bad. If it does work, your problem lies elsewhwere.