Speed Control Indicator (Escape, Mariner)
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives the speed control signal from the speed control module through hardwired circuitry. When the speed control is engaged, the speed control actuator provides a ground to the instrument cluster to illuminate the speed control indicator.