stereo wiring diagram probleme

Hi guys. Can anyone help me? I just changed my stereo that I had at my 2003 K12 Micra and I can't use my steering wheel commands. The new stereo has the possibility to wire the steering wheel and all the wires are labeled only I don't know the meaning of the four wires from the command socket. Does anyone has the meaning of the four wires from steering wheel socket? Thanks!
Usually its a special iso that takes car wiring including steering controls,and plugs into aftermarket stereo. About 10-15 on ebay

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