Indicator Lights In The Outside Mirrors - Volkswagen Golf GTI 2016 Owner's Manual

speeds above about 9 mph (15 km/h).
The Blind Spot Monitor automatically deactivates when driving
through tight curves in the road. In this situation, the deactivation
occurs without a driver information message. No warnings appear in
the mirror glass or in the instrument cluster display. After driving
through the curve, the Blind Spot Monitor automatically reactivates
and the system is available again.
Indicator lights in the outside mirrors
The indicator light → Fig. 176 in the glass for the respective outside
mirror informs you about traffic to the rear, if the system interprets
the situation as critical. The indicator light in the driver side outside
mirror informs you about traffic to the left, and the indicator light
in the passenger side outside mirror informs you about traffic to
the right of your vehicle.
Tinting on the side windows or aftermarket tinting films can interfere
with the indicator lights in the outside mirrors or cause false
readings.
Keep the glass in the outside mirrors clean and free of snow and
ice, and do not cover the mirrors with stickers or other objects.