Toyota Avensis Owner's Manual page 264

2-3. Operating the lights and wipers
Vehicles without front fog lights
 Fog lights can be used when
Vehicles with front fog lights
Front fog lights: The headlights or front position lights are turned on.
Rear fog light: The front fog lights are turned on.
Vehicles without front fog lights
The headlights or front position lights are turned on.
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AVENSIS_OM_OM20B99E_(EE)
Off
Rear fog light on
Releasing the switch returns
the ring to the position.
Operating the switch again
turns only the rear fog light off.