I have had the same problem since I bought the car. If anyone has a solution for this, I'd sure like to hear it. Best I can figure is that the switch is bad on the driver's side, but that's just a guess.
I'd figure out how to remove the switch with the wiring hooked up then take a voltmeter and see if I had power one way in the lock position and the other in the unlock position. ie: +12v one way, then with the test leads in the same place, - 12v the other. The locks are just run by an electromagnet, power it one way it pulls the 'core' in, power it the other it pushes the 'core' out. The core operates the lock. Just my opinion, I'm not sure how the switch wiring looks so that's the best I can do.
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