The ignition must be in the ON position for the fog lamps to come on.
To turn the fog lamps on, press the exterior lamps button. A light will come on in the instrument panel cluster. Press the exterior lamps button again to turn the fog lamps off.
When the headlamps are changed to high-beam, the fog lamps also go off.
Some localities have laws that require the headlamps to be on along with the fog lamps.