I'm going through this proces right now with the dealer and it is a PITA! Neither of my seats worked, just found this out when it started to get cold last October. Anyway, they tested the switches and found both were bad. Ordered replacements, passenger was correct, driver side wrong part. So they replaced the pass. side switch and the seat back now works but no butt section. So now new butt section- get this $1300 because the airbag seat sensor is integrated with the seat! I get this replaced and now the airbag light is on so they order a new cushion after an afternoon of trying to diagnose the problem. Still waiting on the new one to come in.
They have received numerous switches and been back and forth with Nissan on the drivers side. Seems as though there is a correct box, with the wrong part in it from Nissan. Seems to be a part specific to '05's as the part changed for '06-'07 and was completely redesigned for '08. So 4 trips in for diganosing and installing incorrect/broken parts. They actually brought me back with the center disassembled and showed me the new part and old part, very small difference in where the connector attaches. Parts manager took pictures to send to wherever they get the parts to make sure they get the correct one. They have received 6 or so of the listed part number and they all are incorrect when they take them out of the box.
So right now I have no heated driver seats, heated pass seats with no functional airbag sensor and a nice blinking red light in the cluster.
I suspect a lot of problems stem from people placing their knee on the seat to reach something behind them and causing the heating element to separate. the elements are not really that thick. I do feel bad for the service folks, they have always been very good to me and hate telling me that they (Nissan) screwed up.
Good thing this truck still makes me smile whenever I get into it!
Steve