i have a 1993 buick park avenue and it has that nice feature but i didnt need a special harness, that would **** if the newer models needed one though just a waste of money. Ive heard of mercedez benz vehicles needing special keys in order to remove the head unit other than that i havent heard of a special removal fee sounds to me like a bunch of B.S that's why i hate car audio shops, best of luck to ya //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifSome newer model automobiles need certain harnesses that enable the use of factory settings like on GM trucks so that when the headunit doesn't go off until you open the door, door chimes, etc.