2012 drivers door sensor not registering when open.

have you played with the switch by the hinges? do the interior lights come on when you open it?

 

i'm sorry, that's the only switch. what about the lights?

 

You most likely have a drivers door switch that is stuck CLOSED. This is why the interior lights do not come on when the driver's door is open. The spring and sliding mechanism likely just need some oil.

 

I don't know what the Gen3 door switch looks like or where it is situated. Assuming if it is like the Gen2s, there should be a screw holding it to the door jamb. Remove the screw and carefully pull the switch out. Apply some lube to the spring and the slider. Tri Flow or a lubricant that is formulated for the garage door spring. WD40 as a last resort.

 

Did you pull the door switch out completely? There usu is a wire that attaches to the switch. Assuming the wire is still attached to the switch:
1) a break somewhere in the wire.
2) the switch is bad.
3) both a break and a bad switch.

 

Swap driver door switch with a working switch.
If the front and rear door switches look the same, swap a known working switch with the front driver door switch.
If the rear door switches look different from the front door switches, you will have to swap front passenger door switch with front driver door switch.
This will then tell you it is a switch or wire problem. If the swapped switch makes the driver door trigger the lights, it is a defective switch. If the swapped switch does NOT trigger the lights, it is a wire problem.