FAB 4

Any one out there have problems with power locks on 4Runners? I have one in my shop that will only unlock all the doors from the drivers side lock button. Passenger side works fine...locks all 4 doors. The doors will not lock with the drivers lock switch. I took the switch...a wonderfull design, which is probably very reliable...apart and cleaned the contacts, which really did not need any cleaning. I am suspecting the wiring that runs through the door pillar into the door and the possible culprit. Any suggestions?

Thanks