2012 Cadillac CTS Owner Manual - Page 196

6-6 Lighting The parking lamps must be on for the fog lamps to work. If the high-beam headlamps are turned on, the fog lamps will also turn off. They will turn back on again when you change back to low-beam headlamps. Some localities have laws that require the headlamps to be on along with the fog lamps. Fog Lamps Interior Lighting Instrument Panel Illumination Control The instrument panel brightness knob is located on the instrument panel next to the steering column. D (Instrument Panel Brightness): Turn the knob clockwise or counterclockwise to brighten or dim the lights. Turn the knob completely clockwise to turn on the interior lamps. Use the fog lamps for better vision in foggy or misty conditions. The fog lamp control is located on the turn signal/multifunction lever. Turn the fog lamp band on the lever up to # and release it, to turn the fog lamps on or off. The band will return to its original position. # (Fog Lamps):