You have a choice to make that is:-
1.Keep to Renault cd player and use the dash display panel
along with the remote control by the steering wheel.
2.Change to an after market head unit and loose the display
The connection to the head unit is standard iso connectors
with the extra mini iso for the display/remote.
The head unit itself is a din standard with a curved front,
adapters can be bought to fit an after market unit into a Scenic dash,(Halfords/
It is a change i made a few months back,choice i made was to fit a later model philips head unit (tuner list) into the dash and keep the display/remote.
food for thought.
Happy New Year