I have a 99 SlK 230. I purchased a CD player from EBAy. I made sure its the correct model number. I have it hooked up properly I beleive- Powere cabel (I know I have power from the little green light on th unit) and fiber optic cables- bot changer and head unit using the correct cables (not hte ones for the phone). When I hit the button on the head unit for CD, it displays"NO CD CHANGER" is there a computer code to set or something?? hELP!!

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Karl