We have a really frustrating issue with our vw. The beta radio stopped working so I bought a second hand vw beta radio from eBay. The radio came with the code and was tested before despatch. When I installed the new radio it lit up with the lights and the red light flashed for the alarm but it would not power up. The screen just flashed blue and nothing more. The old radio does nothing.
The seller suggested it is an electrical issue in the car. I have checked the voltage over all three of the supplies and I am getting 12v then the other two are reading about 3v. All the fuses are fine. No idea what to try next. Anyone got any ideas what the problem may be or how to diagnose the issue.
Many Thanks. Mark