Megane RS 2004 Stereo Problem

[ramigojag]

recently bought a 2004 megane rs with an aftermarket cd player and decided to change it back to a standard one, however once connected up i can only find 2 groups of cables they are the power with the +12v, ground, and ignition

and the speaker block with all the speaker wires in

however no sound comes from the cd player

i have the code for the radio

firstly:

can anyone tell me how to input the radio code with the display not plugged in and the steering wheel controls not plugged in

secondly: does anybody have a wiring diagram for the stereo system i cant find the block for the display or the steering wheel controls behind the dash anywhere

thanks