Use CarPprog with A1 adapter to decode this radio by OBDII. Make A1 modification - short OBDII pins 3 and 7 - car radio K-line is on pin 3 on Opel cars.

Also you can decode these radios on-table with CarProg adapter A10 - use these wiring:
 

 

^NOTE! This software is included in CARPROG basics or  CARPROG FULL packages.