Wiring Problems- NEED HELP

My girlfriend had an aftermarked cd player fitted to her 206, whoever fitted it has disconnected the seperate aerial lead and connected it to the wiring block, he also altered the wiring from the cd playre to the connecting wiring block so it worked. The cd player was recently stolen and, although I can fit a cd player (it's not difficult) I am having trouble with this as I don't want to guess which is the correct wire (the one that has nothing to connect to on the new cd players wiring block)

Is this the only way I can do thi without tracing the wire back to the external aerial? I would really appreciate some help as I don't want to pay for another cowboy to come and do the same! Does anyone have a wiring diagram for the CAR rather than the CD player?