Volkswagen Golf GTI 2016, Owner'S Manual, Page: 983 / 1341

Rear Traffic Alert on or off.
When the box next to the option is checked , the function will turn
on automatically when the ignition is switched on.
The indicator lights in the outside mirrors will turn on briefly to
confirm that the Blind Spot Monitor is ready.
The indicator light in the instrument cluster informs you about the
status of the system.
The last system setting that was stored is kept after switching the
ignition off/on.
If the Blind Spot Monitor was deactivated automatically, the system
can only be activated again after switching the ignition off/on.
Automatic deactivation of the Blind Spot Monitor
The radar sensors for the Blind Spot Monitor with Rear Traffic Alert
turn off automatically if the system detects a permanent obstruction
over a radar sensor. This could occur if the radar sensor area is
covered by ice or snow, for example.
A text message appears in the instrument cluster display when the