2000 E-series with electric locks and remote lock. Remote lock/unlock works fine for both lock/unlock. Neither driver nor passenger door lock/unlock control works for the unlock function. Lock function works fine. ??

 

I am suspicous this might be a programming thing. Do you have a owner's manual for it?

 

remove drivers door panel-4/5 screws around perimeter-lift panel upward to remove.
remove switch panel-brush off or blow out switch block contact areas.

the unlock switchs are grounded out somewhere, start there.

look at the wires on the body wall near your right foot, follow that harness thru the step up box under the door.

clean and repaint interior box !

 

the small triangular panel near the A/C vent removes...there's a panel screw under and a retaining lip for the main panel