by driver's left foot and back from parking brake.

If my driver's side electric door lock will not lock when I push the button to lock the door on the driver's side (note: the pax side door lock does not have the same problem. If I push the door lock button, it locks the pax and rear doors), just the front door lock will not lock when I push the button to lock the door. I had not tested the pax side door lock button locking the door on the pax side and the rear doors, but it works and locks the pax door and the rear door), so I am thinking that this maybe a fuse problem since I am having trouble with only one electric door lock. BTW, how does a dealership rate, using the KBB standards, of what condition a car is when wanting to trade it in.... What are the standards for a used car to be considered in "excellent" condition, "good", "fair", "so-so"