2011 Cadillac DTS Owner's Manual - Page 185

Headlamps on Reminder A warning chime will sound if the exterior lamp control is left on in either the headlamp or parking lamp position and the driver's door is opened with the ignition off. Daytime Running Lamps (DRL) Daytime Running Lamps (DRL) can make it easier for others to see the front of your vehicle during the day. Fully functional daytime running lamps are required on all vehicles first sold in Canada. The DRL system makes the turn signal lamps come on when the following conditions are met: ... When automatic lighting is on and it is bright enough outside, the regular lamps go off, and the DRL takes over. If the vehicle is started in a dark garage, the automatic headlamp system comes on immediately. Once you leave the garage, it will take approximately one minute for the automatic headlamp system to change to DRL if there is light outside. During that delay, the instrument panel cluster may not be as bright as usual. Make sure the instrument panel brightness knob is in the full bright position. See Instrument Panel Brightness on page 4‑29. Turning on automatic lighting or the headlamps will deactivate the DRL. If the parking lamps or the fog lamps were turned on instead, the DRL will still deactivate. To idle the vehicle with the DRL off at night, turn off automatic lighting and shift the transmission into P (Park). Placing the vehicle in P (Park) disables the DRL. The DRL will stay off until the vehicle is shifted out of P (Park). To drive the vehicle with the DRL off, turn off automatic lighting and manually turn on the parking lamps or fog lamps, if the vehicle has them. The regular headlamp system should be turned on when needed. It is still daylight and the ignition is on. The exterior lamp control is in the off position. The transmission is not in P (Park) (United States only). The light sensor is covered or not detecting light. See "Sensors" under Dual Climate Control System on page 4 ‑ 33 . . When DRL are on, no other exterior lamps such as the parking lamps, taillamps, etc. will be on when the DRL are being used. The instrument panel will not be lit up either. When automatic lighting is on and it is dark enough outside, the turn signal lamps turn off and normal low-beam headlamp operation occurs. 4-27