1996 Ford Explorer Owner's Manual - Page 87

Overdrive Off Indicator (If equipped) This light tells you that the Transmission Control Switch (TCS) on the gearshift lever has been pushed. When the light is on, the transmission does not shift into overdrive. Depressing the button on the shifter once more returns the vehicle to overdrive mode. The transmission will be in the overdrive mode when the vehicle is started even if the O/D OFF mode was selected when the vehicle was last shut off. NOTE: If the light does not come on when the TCS is depressed or if the light flashes when you are driving, have your vehicle serviced at the first opportunity. If this condition persists, damage could occur to the transmission. Overdrive off light (if equipped) Speed Control Light (If equipped) 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 does not indicate any problems with the speed control system, but is only a convenience to tell you when the speed control system is active and ready to maintain a set speed. 86