I suggest that the driver's side mirror wiring is disconnected at the mirror or the switch. The outside mirror casing comes off, have a look inside and see what you see. I think (not having done this) you pry the switch out.
Can you adjust the right side mirror? Sometimes the switch gets cr*p spilled on it and gums up; in that case several doses of contact cleaner while working the switch can restore function.
Charlie
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