siemens VDO CDR500 display protocol?

Hello,
I have vdo cdr 500 cd player. I installed it on a car other than opel. inserted the code, everything went swell. Only problem is i'm working blind. The display is in the dashboard of the original opel car. Can anyone help me with the display protocol, and which pins should i use to interface it with a microcontroler to have a display?, or a link to a service manual?

thank you very much