Nissan immobilizer system 2
https://wiki-byte.win/index.php/How_to_Approach_a_Spare_Key_Nissan_Fix_When_the_Key_Symbol_Appears
The Nissan immobilizer system is a security feature that prevents the engine from starting unless the correct key fob is present. It uses a transponder chip that communicates with the car's computer, locking the ignition, fuel pump, and starter circuit if the signal isn't recognized. Most models have a small LED on the dashboard that flashes when the system is armed. It's reliable, but sometimes a dead fob battery can lock you out, requiring emergency backup procedures.