as ray said, To get the steering wheel controls to work u will need a Renault Audio Steering Control Interface, cost about £40 off ebay or approx £100 from the likes of halford, you will then need a brand paciffic lead (in your case a JVC one) that then connects this interface to you new radio. but this is model dependant also. ( weather or not the new radio is wired remote controll compatible) this lead cost approx £6.
theres no way to get the display working unless its a sony, but then again you will need the interface thats made for sony headunits as these do the steering wheel controll and display but cost more.
what model number is your new radio??? as it will be pointless if the unit doesnt take a wired JVC remote control
This link is to the interface you will need is listed as part number CTSRN005 priced at £53.79p.
https://www.nexxia.co.uk/Car_Stereo_fitt ... megane.htmThis link is for the Brand paciffic lead. click on link and scroll down to "JVC Steering control adaptor" BUT U NEED TO FIND OUT IF THE RADIO U HAVE BOUGHT WILL TAKE A WIRED JVC REMOTE CONTROL.
https://www.nexxia.co.uk/Car_Stereo_fitt ... aptors.htm