Lexus 2013 IS250 Owner's Manual page 214

212
4-3. Operating the lights and wipers

Fog lights can be used when
Vehicles with a front and rear fog light switch

Front fog lights: The headlights or the front position lights are turned on.
Rear fog light: The front fog lights are turned on.
Vehicles with a rear fog light switch

The headlights or the front position lights are turned on.

Operation guide display (vehicles with rain-sensing windshield wipers only)
When the fog light switch is operated, the current status is displayed on the
meters for a few seconds. (P. 103)
IS250_EE(OM53B11E)