My remote stopped working so I assumed the batteries were dead. Replaced them and tried to reprogram but the car will not go into reprogram mode (key in ignition-on, key in door) I don't get the 3 beeps. Wiring in the door harness looks good. What next? What is a good way to check the switches, and is there any way to actually check the module?

Doe the rest of the power door lock system function correctly?

I can lock/unlock everything but the drivers door from the dashboard, but the key in the drivers door does nothing but the drivers door. Is there some sort of sensor in there?

Yes.