I don't have the illumination wire hooked up just yet. The sensor seems to do a good job of dimming the display. My question is if I hook up the illum wire does the display of the map actually change? In my old TL it would change the background from tan to black. Does the D1 do this or is the illum wire just to dim the display if you are not using the sensor?

Yeah the map colors change just like your tl did.

Sweet. I'll go ahead and hook it up then. Thanks!