1993 Cadillac DeVille Owner's Manual - Page 119

To operate it, leave the light switch off and move the Twilight Sentinel control to any position but "OFE" If you move the controlall the way to MAX, your lights will remain on for three minutes after you turn off your engine. If you move the control so almost all the way in the other direction, it's just on, thelights will go off quickly when you turn off your engine. You can change this delay time from only a few seconds to three minutes. Please don't cover the light sensor. It is located on the topof your instrument panel. If you cover the sensor, it will read "dark" and your lights will come on. Day Time Running Lights (Canada Only) The Canadian FederalGovernment has decided that "Daytime Running Lights" (DRL) area useful feature, in that DRL can make your vehicle more visible to pedestrians and other drivers during daylight hours. DRL are required onnew vehicles sold in Canada. Your DRL work with a light sensor on top of the instrument panel. Don't cover it up. The high beam headlights will come on at reduced brightness in daylight when: The ignition is on The headlight switch is off, and The transaxle is not in "P" (Park). At dusk, the DRL will switch off and theexterior lights will come on automatically. At dawn, the exteriorlights will go out and thehigh beams