Your factory radio locks itself to prevent theft. If the radio loses continuous power—for example, when:
A is a unique four-digit PIN used to unlock Volkswagen "MFD" (Multi-Function Display) and navigation systems, typically manufactured by Blaupunkt . These units enter a "SAFE" mode as an anti-theft measure whenever power is lost—such as after a battery replacement or jump-start. Where to Find Your Radio Serial Number vwz1z7 radio code
To remove a VWZ1Z7 radio from most VW/Seat vehicles (Golf Mk4, Bora, Leon Mk1, Toledo, etc.): Your factory radio locks itself to prevent theft