you would probably find that they are all ready wired for it but lack the accessories to use it, i have a friend who go the base model 300c which didn't come with auto lights...(apparently) He took of the head light switch and found a clip on the inside, after removing it he put it back together and the switch turned 1 more click to the right and what do you know the auto lights worked. most new cars are set like this. It make for easy money for the car company cause if you request extra's they say that will cost 300 more but all they have to do is remove the clip.. ( in this case)