Low beams
When driving with the lighting ring in the
position, low beam will be automatically activated in weak daylight or dark conditions, when the ignition is in the II position.

Lighting ring in AUTO position.
With the lighting ring in the
position, the low beams will be automatically activated if:
Front fog lights* are activated.
Rear fog light is activated.
Rear and front fog lights are activated.
With the lighting ring in the
position, low beams will always be on when the ignition is in the II position.
Tunnel detection
The vehicle will detect if it enters a tunnel and shift from daytime running lights to low beams.
Note that the left-hand steering wheel lever must be in
position for tunnel detection to work.
* Option/accessory.
Test yourself
A quick Volvo XC90 quiz: every answer comes with an explanation and a link to the manual page.