I wanted to up date you on my progress.
Today I went to a local mechanic who is a certified Mercedes Benz mechanic and he had the tools to remove the radio. As you stated the vehicle wiring and fiber optics were not hooked up to the radio head. After plugging in the items the CD changer came to life.
I still am having a problem ejecting the CD magazine. I have to tap the player to get all the trays to retract so the magazine will eject. Maybe because it is a new magazine and an old player. I will have to live with that.
Your articles and personal attention were very helpful and I wanted to say Thank You for your assistance.