If that's an original VW radio, you're tied to the dealership. If a fuse is blown for the memory circuit, or the battery is disconnected for any reason or run dead, you will have to enter the unlock code. If you don't know it, you may need to replace the radio. Nice way to design a car to trick owners, huh?
What is the symptom? "Doesn't work" can mean a lot of different things. There will be two fuses, even for aftermarket radios, and the memory fuse is usually not labeled as such. The circuit is tied in with another circuit that may also be dead. Common circuits are the horn, cigarette lighter, and most often, interior lights.
Thursday, September 26th, 2013 AT 12:04 AM