What is the as button for on radio in 2003 volkswagen passat?

In a 2003 Volkswagen Passat, the "AS" button on the radio stands for "Auto Scan." When pressed, it allows the radio to automatically scan through available radio stations, pausing briefly on each one to allow you to listen to a segment of the broadcast. If you find a station you like, you can simply stop the scan and tune in to that frequency. This feature makes it easier to find stations without manually searching through them.