I've got a 2003 vectra c and have brought a new double din dvd player, i need to know for the steering wheel controls to work, i've a lead which came with the new unit and on the end i just plug into the back of the head unit and on the other end is 3 wires which 1 is brown and labeled (KY1) one black wire labeled (GND) and the last wire is white and labeled (KY2). Please does any body know which wires do i need to connect these up to please. many thanks