1999 Cadillac Catera Owner's Manual - Page 105

yellowblue When the Twilight Sentinel is on and it's dark enough outside, the high-beam headlamps (at reduced intensity) will change to low-beam headlamps. When it's bright enough outside, the regular lamps will go off, and the high-beam headlamps change to the reduced brightness of DRL. To idle your vehicle with the headlamps off, turn off the Twilight Sentinel switch and shift the transmission into PARK (P). Placing your vehicle in PARK (P) disables the DRL. The DRL will stay off until you shift out of PARK (P). If you're not in PARK (P) and the Twilight Sentinel system is turned off (and it's dark enough outside), the DRL will remain active and this light on the instrument panel will appear. This is a reminder that headlamps are required. The following conditions will override the DRL: D your vehicle's transmission is shifted back into PARK (P) with the ignition in ON or START, D the low-beam headlamps are turned on (using the manual lamp control dial), D the wiper-activated headlamps are in use (DRL will come back on 20 seconds after wipers have turned off), D using the flash-to-pass feature and D turning on the Twilight Sentinel. As with any vehicle, you should turn on the regular headlamp system when you need it. 2-43