Speed Control (Service Information): Operation

The speed control switch stalk located to the left on the left side of the steering column controls all speed control system features. When a selection with the switch is made, it provides a hard-wired resistor multiplexed analog input to the Body Control Module (BCM). The BCM is a gateway to the Controller Area Network (CAN) data bus and monitors the hard-wired speed control switch and stop (brake) lamp switch inputs, and sends these inputs to the Powertrain Control Module (PCM) through the CAN bus.

The PCM continually monitors these inputs, as well as electronic vehicle distance  message inputs from the Antilock Brake System (ABS) module, along with other inputs, and provides the appropriate outputs to perform the requested electronic speed control features.

The PCM constantly monitors the speed control system electrical circuits to determine the system readiness. The PCM will set the appropriate Diagnostic Trouble Code (DTC) if a monitored system fault is detected.