Theory Of Operation
WARNING: This page is about a different car, the 2022 Chrysler Voyager and 2022 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
The Speed Control Switch uses a LIN Bus to communicate with the Steering Column Control Module (SCCM). The SCCM then broadcasts the speed control switch status over the CAN Bus. The Adaptive Cruise Control (ACC) module monitors the CAN Bus for Speed Control Switch status.