Description And Operation: 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 pod provides bussed inputs to the Steering Column Control Module (SCCM) microcontroller.
SCCM acquires bussed inputs from the speed control push button assembly and then transmits the status via CAN-C network to the Powertrain Control Module (PCM).
PCM manages the speed control algorithm to maintain vehicle speed established by the driver. It is also the responsibility of the PCM to send out cruise control override information and perform stuck button diagnostics.
The radio switch resistive ladder inputs are read by the steering wheel switch bank and broadcasts the signals on LIN.

The SCCM provides a clean ground and fused B(+) current for all of the switches and sensors on the rotating steering wheel through the slave node circuitry of the speed control switch pod as well as for the Light Emitting Diode (LED) back lighting of both the speed control and the EVIC switch pods. The SCCM continually monitors all of the hard wired speed control switch circuits as well as the bus data. The SCCM will set a Diagnostic Trouble Code (DTC) for any problem it detects in the speed control switch circuits, and will store a Signal Not Available (SNA) code for any bus input errors. The SCCM also communicates with other electronic modules over the Controller Area Network (CAN) data bus. Therefore, any SCCM DTC information can be retrieved using a diagnostic scan tool connected to the Data Link Connector (DLC).