Mercedes-Benz GLB Owner's Manual page 636

Warning/indicator lamp
Driving systems
Warning/indicator lamp
L
Warning lamp for distance
warning function
Possible causes/consequences and
Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving.
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Note the messages on the multifunction display.
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Consult a qualified specialist workshop.
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Possible causes/consequences and
The red distance warning lamp lights up while the vehicle is in motion.
* The distance to the vehicle in front is too small for the speed selected.
If there is an additional warning tone, you are approaching an obstacle at too high a speed.
Be prepared to brake immediately.
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Increase the distance.
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Function of Active Brake Assist (
M M Solutions
M M Solutions
page 231).
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Display messages and warning/indicator lamps 633