I have a td5 es model and there is no cd multichanger under the drivers seat.There is a wire with a rectangular plug on (10 pin ) under the seat not connected to anything is this for the multichanger.I have 2 multichangers one from a p38 I had and one from a rover 800 that was scraped by my dad.Both these are 13 pin round fittings is this wire for the multichanger.