Push-Button Ignition Switch
WARNING: This page is about a different car, the 2015 Infiniti Q70. 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 push-button ignition switch. BCM maintains the ignition switch status while push-button ignition switch is not operated.