Opel radio CDR2005 interfacing Arduino UNO R3

Hi folks,

I got an radio car CDR2005 from an Astra G, but my MID/TID is damaged. So I want to communicate to this radio using an Arduino UNO R3 to see data like MID/TID does.

At the back of CDR2005 I got 12V+, GND, 12V_IGN and communication uses SDA, SCL and MRQ. I can send data to MID/TID but I cannot search any kind of library or methods to communicate and read the data from SDA,SCL and MRQ of CDR2005.

Can anyone help with communication (SEND/READ) betwen CDR2005 and Arduino?

Thanks!

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