Push-button Ignition Switch
WARNING: This page is about a different car, the 2012 Infiniti M35h. However, it is still accessible from the selected car via links, so may be relevant.
Push-button ignition switch has push switch inside which detects that push-button is pressed, and then transmits the signal to BCM. BCM changes the ignition switch position in accordance with the operation of pushbutton ignition switch. BCM maintains the ignition switch status while push-button ignition switch is not operated.