so allow me to further help you, go to metraonline.com, then select the products tab,,
then inter your year, make, and model. then look at the install instructions for the dash kit for your car,
the dash disambly instructions will be written out for you to use.
then you can remove your radio and check to see if it is really disconected.
Sorry but I can't find any information about my Navigation System..
I have Volkswagen Passat 2008 with Pioneer AVIC-F9110BT, maybe wrong forum?