Conventional Speed Control

WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle operator controls all conventional speed control system features through the speed control switch pod on the face of the right horizontal spoke of the steering wheel. The SCCM reads the speed control switch input via LIN bus. The SCCM relays an electronic speed control switch status message to the PCM over the Controller Area Network-Chassis (CAN-C) data bus. The PCM software continually monitors these inputs as well as electronic vehicle distance message inputs from the ABS module and numerous hardwired inputs including the brake pedal position sensor, then provides the appropriate electronic message and hardwired outputs to invoke the requested electronic speed control features. The PCM manages the cruise 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 PCM microcontroller continuously monitors all of the speed control system electrical circuits to determine the system readiness. If the PCM detects a monitored system fault, it sets and stores a DTC. The PCM uses OBD and can communicate with other ECUs in the vehicle as well as with the diagnostic scan tool using the CAN data bus. This method of communication is used for control of the MIL in the IPC and for system diagnosis and testing through the 16-way DLC located on the driver side lower edge of the instrument panel.