Circuit/System Description
WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
The Stop/Start Disable switch provides a signal to the K9 Body Control Module (BCM) when the button is pressed and released by the signal circuit 1111. The K20 Engine Control Module (ECM) receives the stop/start switch signal via serial data from the BCM.