A couple of people have raised the issue of the Pioneer H/U's leaving the power aerials constantly up. If you don't like this (like me) you can fit a switch similar to what I have done.
Just wire it inline to your remote switch and power aerial line. I mounted mine in the storage pocket below the H/U facia (VZ).
I also ran my usb cable through there as well.
The switch will need its terminals bent to 90' angles to fit your connection terminals in the space available.