2001 Cadillac Eldorado Owner's Manual - Page 106

Light Sensor Exterior Lighting Battery Saver If the manual parking lamp control has been left on, the exterior lamps will turn off approximately 10 minutes after the ignition is turned to LOCK or ACCESSORY. This protects against draining the battery in case you have accidentally left the headlamps or parking lamps on. If you need to purposely leave the lamps on for more than 10 minutes with the ignition in LOCK or ACCESSORY, turn the exterior lamps control knob off and then back on. To delay the lamps from turning off, see "Twilight Sentinel" in the Index. The light sensor for the Daytime Running Lamps (DRL) and the Twilight Sentinel is located in the center of the front defogger grille. If you cover the sensor, it will read "dark" and the lamps will come on. 2-45