Thanks - but the dealer already changed out the BCM. Cost me $600.00! That was one of the first things they did. They replace it - and gave it back to me and said it was fixed. I hadn't even left the dealer lot and I tried the windows and nothing! Took it back - they checked it and said they hadn't plugged in the BCM correctly (wasn't snapped in tight at the connector) - gave it back to me. Again, I am on the road trying the windows a few minutes later and it's not working again. I know this sounds crazy - but after you disconnect the battery to work on it - and then reconnect - it resets itself and everything works. But the minute you turn on the ignition and everything gets juice - whatever is failing seems to fail at that moment. Then the seat, windows and locks all don't work. If you disconnect the battery again - then it works. But the moment you start it up - bang - not working. Unless the driver seat is in a certain position (as indicated below) - then it works fine even when you reconnect and start it.
The reason I say it's related to short in the power seat harness or some relay related to the seat is that when the seat is adjusted a certain way (all the way up and close to the steeing wheel which is how my wife needs it) - it all works fine. When I drive the car - I adjust the seat amost all the way down and all the way back (and I weigh 250) - then we see this pattern of failure. That's why I think it's related to the seat somehow - despite all the theories that it's the main wiring harness, BCM, etc. I guess I was hoping this is something common and others would say - yeah - here's the solution, it happens all the time. But apparently it's not that simple - because most people point me to some diagnostics checklist (which I a appreciate but am not able to do on my own). The dealer has all the equipments, master techs, etc - but I am not impressed in their ability at all after 4-5 visits and now their diagnosis that I need a main engine wiring harness that will run almost 3 grand parts/labor. I am not convinced that this is the issue. Why they will not listen to me regarding the seat as being a hint of what could be wrong - I don't know ... probably time to bring it somewhere else. Does anyone know a good tech/shop for Nissans in Jacksonville FL?