Circuit/System Description
WARNING: This page is about a different car, the 2021 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
The lane keep assist switch is part of the S26 Hazard Warning Switch. It is a normally open switch that closes when the switch is pressed. The K9 Body Control Module monitors the switch on signal circuit 3153 and the switch receives a constant ground on ground circuit 1450. When the lane keep assist switch is not pressed, the switch is open and signal voltage observed by the K9 Body Control Module is high. When the lane keep assist switch is pressed, the switch is closed and signal voltage observed by the K9 Body Control Module is low.