Toyota Prius Owner's Manual page 273

Type B

Fog lights can be used when
Front fog lights: The headlights or front position lights are turned on.
Rear fog light: The front fog lights are turned on.
NOTICE

To prevent 12-volt battery discharge
Do not leave the lights on longer than necessary when the hybrid system is
off.
PRIUS_OM_OM47A19E_(EE)
2-3. Operating the lights and windshield wipers
Turns the front and rear fog
lights off
Turns the front fog lights on
Turns both front and rear
fog lights on
Releasing the switch returns
the ring to the
Operating the switch ring again
turns only the rear fog light off.
2
position.
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