First thing to check would be the door jamb wiring, looking for cracked insulation and frayed wiring. Second would be the power door lock switches themselves.
There is a fuse for the power locks, but it is also used by a variety of other devices as well:
Fuse Box Diagram Toyota 4Runner (N180; 1995-2002)
Quote:
Power back window, back door lock, back window wiper, open door warning (back door), power door lock control system, back window defogger, horns, theft deterrent system
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