Does anyone have any idea as to how to "enable" my subwoofer on my 2008 Ford Expedition King Ranch EL? I purchased an OEM 2008 model navigation system from ebay and everthying but my subwoofer works. I found out it wasn't working by pressing 3 & 6 and going into the diagnostics page. I'm trying to keep from going to the dealer and having my unit flashed and spending $150!!! Is there a hack similar to the GPS hack?