I don't know if anybody has....but Crutchfield has an adaptor that they state works with most Nissan steering wheel controls.......you might give them a call.....
AMS Car Stereo here in San Jose used a PAC <http://www.gotopac.com> (not sure on the web site) for the inteface. PAC did not know how to hook it up specifically for the Titan but I brought over the wiring pages from the service manual and they figured it out. Mounted the IR transmitter right below the head unit and seems to work well (Alpine mulitmedia monitor head unit).
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