Limitations

In certain situations, the BLIS indicator light(s) may illuminate even when there are no other vehicles in the area monitored by the system.
NOTE
If the BLIS indicator lights illuminate occasionally
even when there are no other vehicles
in the blind area, this does not indicate
a fault in the system.
In the event of a fault, Blind spot syst.
service required will be displayed.
The following are several examples of situations in which the BLIS indicator light(s) may illuminate even when there are no other vehicles in the area monitored by the system.

Light reflected from a wet road surface

The vehicle's own shadow against a large, light, smooth surface such as barriers between lanes on a highway

Sunlight directly in the camera when the sun is low on the horizon
See also:
Wind blocker
Wind blocker
The moonroof is equipped with a wind blocker
that folds up when the moonroof is open. ...
ABS (Anti-lock brake system)
If the warning light comes on,
there
is a malfunction of the ABS system
(the standard braking system will
still function). The vehicle should
be driven to a trained and qualified
Volvo service ...
Location of the bulbs in the headlighthousing
1 Low beam headlight/Active Bending Lights
2 High beam headlight (daytime running light
on models with Active Bending Lights)
3 Turn signal
4 Parking light
5 Side marker light ...
