Why do my car's tail lights stay on even when the switch is turned off.

I think the first thing you need a scan tool to diagnose the code, and I know a tool is helpful for nissan, hope help. or you can take your car to the nissan dealer to read out the code, and then they will tell you how to do next. http://www.chinasinoy.com/wholesale/nissan-consult-3-iii-software-professional-diagnostic-tool.html