replace Nissan key battery 11
https://alpha-wiki.win/index.php/What_Does_the_Car_Key_Symbol_Blinking_on_Your_Nissan_Dashboard_Mean%3F
I needed to replace Nissan key battery last week after my fob stopped working. It's a simple job once you find the right CR2032 cell and carefully pry open the case using a small flathead screwdriver. Took me about five minutes total, and now the remote locks and unlocks the car like new again.