So, what I did any way was.
Used Nissan to ISO connector Dna Awh3120.
ISO to pioneer aepro APP0120.
Connected them up then ran a wire from the blue/white wire in the aepro connector to the green/yellow on the oem loom which is on the speaker connector. Mine only has the rear speakers in it, there are two extra wires.
One is the G/Y, I then cut the aerial cable off and soldered an ordinary one on.
I put a cheap deck in, a MVHS405bt. I can't play it over about 1/4 volume, it's so oooo loud. I can get all Sydney stations.