Volvo XC90: Lighting / 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:
the front fog lights* are activated
the rear fog light is activated
the 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.
The vehicle has sensors that detect ambient lighting conditions. With the lighting
ring in the position, the daytime running
lights will always be activated when the ignition is in mode II...
High beam is operated via the left-hand steering wheel lever. High beam is
the vehicle's strongest lighting and should be used when driving in dark conditions,
provided it does not blind other road users, to improve visibility...
Other information:
The radar sensor is used by several driver support systems to detect other
vehicles.
Location of radar sensor
The radar sensor is used by the following functions:
Distance Alert*
Adaptive Cruise Control*
Pilot Assist*
Lane Keeping Aid
City Safety
Steering assistance at risk of collision
Any modifications to the radar sensor may make its use illegal...
Incorrectly connected or installed accessories or extra equipment may have
an adverse effect on the vehicle's electronics.
We strongly recommend that Volvo owners use only genuine, Volvo-approved accessories,
and that accessory installations be performed only by a trained and qualified Volvo
service technician...