My new stereo has "learning" support for steering controls, and I would like to add them in. The stereo head unit has two connections, SW1 and SW2 which I guess go to the steering controls 1 and 2. However, in looking at the FSM I'm a little confused. The FSM lists the two positive connections as BR/GR and V/GR. I am assuming that BR is Brown, but what are V, and GR?