2010 Cadillac STS Owner's Manual - Page 213

Light Sensor Fog Lamps The fog lamp controls are located on the turn signal/ multifunction lever. # (Fog Lamps) : The band with this symbol is used to turn the fog lamps on and off. The parking lamps must be on for the fog lamps to work. To turn the fog lamps on or off, turn the fog lamp band on the lever up to the dot and release it. The band will return to its original position. If the high‐beam headlamps are turned on, the fog lamps will turn off. The fog lamps will come back on when the high‐beam headlamps are off. The light sensor for the DRL is located on top of the instrument panel. If the sensor is covered, it will prevent it from sensing light, and the exterior lamps may come on when they are not needed. Some localities have laws that require the headlamps to be on along with the fog lamps. 4-33