2002 Cadillac DeVille Owner's Manual - Page 120

When the Twilight SentinelRlever is on and it's dark enough outside, the high-beam headlamps (at reduced intensity) will turn off and normal low-beam headlamp operation will occur. When the Twilight Sentinel lever is on and it's bright enough outside, the regular lamps will go off, and the high-beam headlamps at reduced brightness will take over. If it's dark enough outside and the Twilight Sentinel lever is off, a HEADLAMPS SUGGESTED message will display on the Driver's Information Center (DIC). This message informs the driver that turning on the exterior lamps is recommended even though the DRL are still illuminated. When DRL are on, only your high-beam headlamps (at reduced brightness) will be on. No other exterior lamps such as the parking lamps, taillamps, etc. will be on when the DRL are being used. Your instrument panel won't be lit up either. Turning on the Twilight Sentinel or the headlamps will deactivate the DRL and remove the HEADLAMPS SUGGESTED message. If the parking lamps or the fog lamps were turned on instead, the DRL will still deactivate and the HEADLAMPS SUGGESTED message will continue to be displayed. To idle your vehicle with the DRL off at night, turn off the Twilight Sentinel and shift the transaxle into PARK (P). Placing your vehicle in PARK (P) disables the DRL. The DRL will stay off until you shift out of PARK (P). To drive your vehicle with the DRL off, turn off the Twilight Sentinel and manually turn on the parking lamps or fog lamps (if equipped). As with any vehicle, you should turn on the regular headlamp system when you need it. 2-52