2010 Cadillac DTS Owner's Manual - Page 196

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. Cornering Lamps The cornering lamps come on when the headlamps or parking lamps are on and you signal a turn with the multifunction lever. They provide more light for cornering. Exterior Lighting Battery Saver If the exterior lamp button has been left on, the exterior lamps will turn off about 10 minutes after the ignition is turned to LOCK/OFF and a door has been opened. This protects against draining the battery if the headlamps or parking lamps are accidentally left on. If you need to leave the lamps on for more than 10 minutes, use the exterior lamp control to turn the lamps back on after the ignition is turned to LOCK/OFF and any door is opened. Fog Lamps The fog lamps button is on the exterior lamps control to the left of the steering column. # (Fog Lamps): Press the exterior lamps button to turn the fog lamps on or off. A light comes on in the instrument panel cluster when the fog lamps are in use. See Instrument Panel Cluster on page 4-47. The ignition must be in the ON/RUN position for the fog lamps to work. The fog lamps will go off when the headlamps are changed to high-beam. Some localities have laws that require the headlamps to be on along with the fog lamps. 4-30