Got a question the manual it says you can enable Subwoofer output by pressing the AUDIO button. I have pressed the Audio button and held it ....two different menus...but it doesn't take mo the "SUB.W" feature on my pioneer head unit.

I have a pioneer DEH-P4400 and tonight, when i was driving, i noticed that there was a feature imprinted on the background LCD that shows a picture of a subwoofer and the letters "S/W" under it. Immediately, I knew this meant "subwoofer" ...and unfortunately, this feature was not "lit" up or "light" up like features like "LOUD".

Anyone know how to enable it?