2003 Cadillac DeVille Owner's Manual - Page 143

If you move the lever all the way to the right, the lamps will remain on for approximately three minutes after the ignition has been turned to OFF. If you move the lever so it is barely on, the lamps will go off quickly when you turn the ignition switch out of OFF. You can adjust the delay time from only a few seconds to about three minutes. Light Sensor If it's dark enough outside and the Twilight Sentinel@' lever is off, a HEADLAMPS SUGGESTED message will display on the Driver Information Center (DIC). This message informs the driver that turning on the exterior lamps is recommended (it's become dark enough outside to require the headlamps and/or other exterior lamps). Turning on the Twilight Sentinel or turning the exterior lamp control to the headlamp position will remove the HEADLAMPS SUGGESTED message. The light sensor for the DRL and the Twilight Sentinel@' located in the center of the front defogger is grille. If you cover the sensor, it will read "dark and the exterior lamps or the HEADLAMPS SUGGESTED message will be displayed whenever the ignition is on. 3-18