I Have had to replace to compact disc changer on my 2007 Mondeo the unit is made by alpine, have managed to get a second hand unit but the changer is loading the CD's but the radio unit will not see them, it is a radio unit with built in Sat Nav and voice control dont konw the model number do I have to do somthing with the Radio to get it to work, or will I have to plug the car into a computer at Ford