I have just tried to do the same to my 2011 model, and contrary to all reports i have read, there were no wires from the stereo to the steering column.
There are spare cores in the clockspring loom, and i grabbed buttons for the steering wheel from Niss4x4 in Brooklyn from a Nissan Elgrand and it came with the steering wheel loom that you need to splice into the existing Cruise Control Loom.
Unfortunately for me, I cant finish mine untill i get a new loom for my Eclipse GPS Unit, as they tightassed the unit, by providing a loom without the wires for the steering wheel control function ......
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