Fade function on facelift Head unit

[Mike G]

This would suggest that the stock head unit in the FL cars has the capability to run rear speakers... anyone done this ? or can point me in the direction for a "pin out" diagram of the relevant socket at the back of the unit, just want to keep the car standard looking.
EDIT......  so had a look at the back of my facelift head unit and to the top right (if viewed from the front) there is a redundant socket which I'm guessing would run rear speakers in other models, just need to confirm this and source a plug........... any ideas

[pacter]

Hi mate,

Did you manage to solve the issue?

If you did it with a usb does it charge the phone as well?

Best,
P