Next to the knob for the main lights there are two vertical rotary dials that control instrumentation lights (right dial) and ambient light (left dial). If you rotate the left dial for ambient lighting all the way down until you feel it click it will turn off all ambient lighting for the dash, doors, and floor. They will also turn off if you have the dial for instrumentation lights at max brightness.
Since I read this thread, I went out and checked mine and it does go out when you close the door, looks like goes out when that door is a lil more than 3/4 way closed. Not sure what is in there to detect that sliding door closing. Since new, definitely a Dealer Trip, IMHO,,.,.,.