1996 Ford Windstar Owner's Manual - Page 144

Speed Control Light (Electronic Cluster Only) This light comes on when you turn on the speed control system and set the speed. The light will be on whenever the speed control is set, even if you override the set speed by pressing the accelerator pedal or by pressing the coast button. The light will go off when the brakes are used or the speed control system is turned off. This light comes on briefly during the display self-test every time you turn your ignition key to the ON position. The light will go off when the key is turned to the START position. The light should stay off when the self-test is done. This light does not indicate any problems with the speed control system, but is a convenience to tell you when the speed control system is actively maintaining a set speed. 142