When the battery is disconnected the radio goes into a locked or safe mode and you have a code to get it to reset (you have two tries and then it locks and the car has to be on for an hour to reset & be able to enter the code again). If you don't have the little card with the code, a VW dealer can get the code for you by entering the radio s/n - and i think on another thread someone said their code was listed on the back of the radio... So your display is completely blank?
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