Toyota RAV4 2010 Quick Reference Manual page 190

2-3. Operating the lights and wipers
Fog light switch
The fog lights improve visibility in difficult driving conditions, such
as in rain or fog. They can be turned on only when the headlights are
on low beam.
168
∗
Off
Front fog lights on
I n f o r ma t i o n P r o v i d e d b y :
∗
: If equipped