Found the correct code on the unit when I pulled it out. Everything is in good working order again.
Thanks for the help.

Ok, got the code from the dealer, turned on the radio, entered the code. Then the radio asked to re-enter the code, wich I did. Then the display showed "system off" and nothing else happens. Wrong procedure? If I have the time I'll pay the dealer a visit. I did not check the voltages yet, ...

Hello, I recently bought a '98 V70 R Now my stereo stopped playing while listening to the radio. All the radio controls freezed and the display showed all the time the same RDS information, even after switching the unit off and on. The cd player seemed to be working, but I had no cd's in the car so ...