Lately we changed the power window motor in my son's '90 F150. When we got all done, the window worked fine, but suddenly the passenger side power lock doesn't work. The driver's side does. It doesn't matter if we use the switch on either door. This is the same side that we did the motor on. I know we pulled something, just need to know where to start looking.

Thanks

Frank

 

The best thing that I can say is to pull the door panel off & look for anywire wires that could have become loose.

Look closely around the door lock switches & the lock motor itself. It has to be a wire that got knocked off somewhere.