i did not recognize because you have a newer generation off head unit and the cd changer is the old one..
to fix this, youll need a compatible cd changer for that unit,, i dont know wich one is, but look on the internet you should be able to find., then just replace the wire that goes form the readio to the trunk,, it simply consitst of takin the lower plastic trim, the one ofver the pedals us spec, then running a new wire from dash to the trunk.. not a big deal,, and when you get to the rear seats, if your car does not have folding seats, then just pull out the rear seat cushion and then youll be able to see where do the wires enter the trunk..
you will also find the wire at ebay or dealer.
and is not a hard to do job.
keep us posted