You are correct. You can open up the actuator and see if you can rehab the switch, but I wouldn't bet on it. It is a tiny little microswitch inside driver's door lock actuator. I had a similar malfunction; my discussion with photos of the microswitch and discussion of how it got damaged at Electrical gremlinSo the exterior and interior door handles are attached to the lock mechanism and that mechanism is mounted on the door jam which engages a catch mounted on the B pillar and the sensor or switch which senses that the door is open is inside that lock mechanism. Is that right? Is the lock mechanism serviceable or does the whole mechanism have to be replaced? Can I take it apart to get at the sensor or spray it with silicone lube?