On my 2004 A8L there is a vent or speaker on the panel of the passenger side between the front & rear seats. I am not talking about the actual air vent outlet that adjusts, but below there is something that looks like a square speaker. When I turn off the car, this stays on like it is venting something. I took it to the dealership and they said it is a vent, and not to worry unless it stays on for 1/2 hour or more it will run down the battery. Well, I have had this car for over 6 years and have never heard this before. Does anybody have any idea what this vent is and how to correct the problem? I am noticing that it is staying on longer and longer.
Thank in advance for any infor.