Parking seanor audible sound not working

[blizard3115]

So i changed media receiver on my Citroen c5 2006 year and added un nu Globe box and connected to it the speakers only to have the original screen working everything but because the speakers no more connected to rt3 receiver there is no sound to parking assistance is there anyway on diagbox to reassing sound to the wheel collumn as i seen dome guys done on their peugeots