Speed Control Indicator
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster provides power to the speed control indicator. On gasoline vehicles, the speed control indicator is controlled by the speed control module. When the speed control is engaged, the speed control module provides the instrument cluster with a ground signal and illuminates the speed control indicator. On diesel vehicles, the speed control indicator is controlled by the PCM. When the speed control is engaged, the PCM provides a ground to the instrument cluster and illuminates the speed control indicator.