Mercedes-Benz GLB Owner's Manual page 581

578 Display messages and warning/indicator lamps
Display messages
Possible causes/consequences and
Initiate a new swivelling procedure and do not re-couple the trailer until the display message disappears.
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If the display message does not disappear, the trailer hitch is malfunctioning and the ball neck is not locked.
Do not couple up the trailer. Drive on without the trailer. Note the reduced ground clearance due to the
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unlocked ball neck.
Consult a qualified specialist workshop.
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* The trailer hitch will not be operational when the vehicle is stationary.
Uncouple the coupled trailer and secure it against rolling away.
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If the ball neck is retracted: to initiate a new swivel movement, press and hold the button on the tailgate until
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the ball neck engages vertically in the locked position and then engages beneath the bumper (
If the ball neck is extended: press and hold the button on the tailgate until the ball neck engages beneath the
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bumper.
If the display message does not disappear, the trailer hitch is malfunctioning and the ball neck is not locked.
Do not couple up the trailer. Drive on without the trailer. Note the reduced ground clearance due to the
#
unlocked ball neck.
Consult a qualified specialist workshop.
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M M Solutions
page 288).
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