So I bought this radio, for a Subaru (with the antenna in the rear glass) you have to connect the Car's blue antenna wire to the Pioneer Blue remote wire if you want your radio to work, these cars need power to the antenna. If you have an amp it's the same lead, you can use it for both amp turn-on and antenna power.
So, if you haven't finished this already:
A to D
B to E
C to parking brake or bypass
F leave alone