So the lights that surround the navi screen on my 05 TL stopped working. Took it into the dealer and they think that either the nav unit or radio need to be replaced. Anyone else run into the same problem. I turn on my headlights and all the interior lights light up except the lights that surround the nav screen. (temp controls, fan speed, nav menu/setup buttons) If anyone has had this problem could you let me know how it was fixed. Thanx