Toyota 2013 Prius Owner's Manual page 324

2-3. Operating the lights and windshield wipers
Fog light switch
The fog lights secure excellent visibility in difficult driving condi-
tions, such as in rain and fog.
Type A
298
PRIUS PHV_OM_OM47787U_(U)
∗
Turns the fog lights
off
Turns the fog lights
on
∗
: If equipped