I have a US 2001.5 B5 S4 with an 8E0 unit installed. I have a subwoofer also which likes to stay on after I turn off the navigation or sjut off the car. Sometimes it will shut off sometimes it wont. So for now I just disconnect the ground when Im not using it. Major PITA. I thought it was only my sub but then I noticed all the speakers stay on for a period of time after the nav or the car is off. What could be the cause of this??? My battery hasnt gone dead so it must shut off during the day sometime.