1998 Cadillac DeVille Owner's Manual - Page 116

If you move the control the way to the right, the all lamps will remain onfor approximately three minutes after the ignition has been turned OFF or LOCK. If to so you move the control it is just on, the lamps will go off quickly when you turn the ignition'switchout of RUN. You can adjust the delay time from only few a seconds to three minutes. If it's dark enough outside and the twilight sentinel control is off, a HEADLAMPS SUGGESTED message will display on the Driver Information Center (DIC). This message informs the driver that tuming on the exterior lampsis recommended (it's become dark enough outsideto require the headlamps and/or other exterior lamps).Turning on the twilight sentinel, the fog the headlamp switch or the lamp switch will remove HEADLAMPS SUGGESTED message. Light Sensor I , .i The light sensor the DRL and the twilight sentinel for is If located in the center the front defogger grille. you of cover the sensor, it will read "dark'' and the lamps will come on.