check under your seat there will be a wiring harness and clip, dare say it has come undone
I am 6'7 and I have seat all the way back on its rails,
had some one sit behind my wife whilst she drove and they scrunched the floor mat up under the drivers chair, I moved the chair back next time I drove and the light came on. 35 pesos for Nissan to reset.
I know the service manager so I didn't get charged for it.
Hope this helps
Mike