Add A Cd Changer I Have A 2000 Jaguar S Type And Want To Add A Cd Changer That Will Work With My Radio Unit.?

I have a 2000 Jaguar s type and want to add a cd changer that will work with my radio unit.? - add a cd changer

It Supposte to an axis 12 in the trunk. I do not see, but you can search in the right place. How do I know whether I am on or before the cable. When I print to radio-CD, displays a message found in (no CD).