Media Outlet in Factory Heated Seat Switch Location

I just got a 2010 Prius II, and thanks to recommendations through the forum I am installing a new stereo with bluetooth, nav, etc. It includes a usb and aux port that I would like to put where the factory heated seats switch goes (does not currently have heated seats and if I do that at some point I probably want the switches on the sides of each of the seats). I'm having trouble figuring out how to access that popout and run the wires. Anyone know where I can find that - instructions, diagrams, etc?