Dice duo trunk install, x3

[Gadgets4U]

Have you Identified what modules you have in the LHS of the Trunk?
If you have a module with a plug similar to the one below (but with thin flat terminals instead or round ones) then thats your radio module. And just like the picture, one of the smaller (white color) 10 pin plugs is not installed, this may be what your problem is as the CD Changer audio is routed through one of these plugs.
If this Black FAKRA plug is in the front centre console then your radio module is there, but check to see if both 10 pin plugs are installed. The picture shows the Auxillary Plug in place but the CD Changer 10 pin plug is not installed.