I remember when my Dad's '02 E was in the body shop & the battery had been disconnected for a week, the radio had to be re-coded in order to make it work again. The code was on a card in the glove compartment's literature. I have found no such card among the booklets in my car's manual portfolio. Does the comand /nav radio have a secret code like the old radios? How can I find out what the code is?