just fishing for you. I as given 2 keys with my used car. 1 wouldn't work so I changed the battery and still nothing changed. I now just use the other 1. here is some old post
Tsb: Various models; intelligent key battery rplcment and discharge indicator reset
also here FilesFile Type: pdf TSB Intelligent Key Inoperative_the370z_com.pdf (87.8 KB, 143 views