When Monitored:
WARNING: This page is about a different car, the 2012 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Any time the Start/Stop Button is pressed, the Radio Frequency Hub (RF Hub) will check the (D122) Security K Line Communication circuit and the (G201) Ignition Switch Position Signal circuit. It samples these circuits every 10ms. while the button is pressed.