The doors are signaled internally to the door latch, I have a sport model, and there are only two wires to each door. unplug it, and the jeep defaults to assuming that door is closed.
You may not want to wire directly to the switch harness, but to the dome light signal. Even then, you want to run that through a relay to minimize your load on the existing wiring. The footwell lights have actually two LEDs, one for when the doors are open, and one for when the headlights are on. You will be looking for the Yellow wire with the White stripe.