Mercedes-Benz GLB 2023 Operator's Manual page 141

Maintenance display
Remove protective film 1 from the mainte-
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nance displays on the tips of the newly instal-
led wiper blades.
When the color of the maintenance displays
changes from black to yellow, replace the wiper
blades.
% The duration until the color changes varies
depending on the usage conditions.
Replacing the rear window wiper blade
& WARNING Risk of becoming trapped if the
windshield wipers are switched on while
wiper blades are being replaced
If the windshield wipers begin to move while
you are changing the wiper blades, you can be
trapped by the wiper arm.
Always switch off the windshield wipers
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and vehicle before changing the wiper
blades.
Light and visibility 139
Removing the wiper blade
Switch off the vehicle.
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Fold wiper arm 2 away from the rear window
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until it engages in the replacement position.
Unclip wiper blade 1 from wiper arm
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remove it in the direction of arrow 3.
2 and