Speed Control Indicator
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives the speed control data from the PCM over the communication network. When the speed control is engaged, the PCM provides a signal to the instrument cluster to illuminate the speed control indicator.