in a nutshell: car is a 1990 190E with stock alpine radio. I changed the battery today. then I started the car and punched in radio code. silly me, thought this would be a breeze, as I had done this before. but no, I messed up, and only after many attempts did I read the radio manual. I should have read it first, but I thought it would be a breeze (I think I read the manual last tuime).

okay, so I know what I did wrong. question is what does it mean to leave the system ON for one hour? do I drive the car for one hour with radio on and then punch in codes? surely I can't leave the key in the ON mode with radio ON for one hour! I'm gonna give it a go tomorrow morning, but my drive is only 30 minutes.