changer

Hi Guys I hope you're all well and will bear with me whilst I ask a question! I've recently bought a beautiful S320 on a 2001 Y plate... Immaculate, 50k miles, very chuffed apart from the lack of audio options! I've no CD Changer fitted but wanted to know if it is likely that the wiring...

Bought around 4 weeks ago :); during first week of ownership no CDC displayed but then disappeared and worked fine until today when no CDC displayed again. Slid open CDC front panel and tried to eject cartridge but won't eject now. Have looked on forums for info. on fuse locations but no really...