So i have my new head unit installed the JVC KD-R641 and on the loom that came with the radio is a light blue cable, not connected to anything and with a little tag on it saying "STEERING WHEEL CONTROLS" well thats a good start so im guessing that i need to join this onto one of the wires on the loom? if so what colour one, if im totally wrong, someone guide me in the correct direction

Many thanks!