2008 Cadillac DTS Owner's Manual - Page 174

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. 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 3-35. 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 PARK (P). Placing the vehicle in PARK (P) disables the DRL. The DRL will stay off until the vehicle is shifted out of PARK (P). 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. As with any vehicle, the regular headlamp system should be turned on when needed. Fog Lamps Use the fog lamps for better vision in foggy or misty conditions. -(Fog Lamps): The fog lamps button is located on the exterior lamps control. The exterior lamps control is located on the instrument panel to the left of the steering column. The ignition must be on for the fog lamps to work. Press the exterior lamps button to turn the fog lamps on or off. A light will come on in the instrument panel cluster when the fog lamps are in use. When the headlamps are changed to high-beam, the fog lamps will turn off. The fog lamps come back on again when the high-beam headlamps are turned off. Some localities have laws that require the headlamps to be on along with the fog lamps. 3-34