Audio Systems: CD Changer, saab 95, original radio

Question
Hi, I have a Saab 95 and the CD Changer wasn't working. So I managed to get another one. When I install it - it seems to work as I can hear the motor etc..
But it shows CDC Locked.
I have researched this but It appears it will need a code which I don't have.
Can you tell me how to get this unlocked ?

Answer
buy a new cd changer that is never been plug in to any car, or dealer only no other way  the way it works is the cd changer marries the radio and it is looking for the original radio
sorry

http://www.oemautosound.com/pc-82-75-6-disc-cd-changer-for-saab-all-models-1994-...