Mercedes-Benz GLB Owner's Manual page 293

290 Driving and parking
Remove the cover cap from the ball head and
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store it in a safe place.
Make sure that the ball on the ball neck is clean.
Check that it is either greased or dry (grease-
free), depending on the instructions for the
trailer.
Folding the ball neck in
Pull release switch 2 until the ball neck
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unlocks.
The ball neck will fold up under the rear
bumper.
Indicator lamp 1 will flash.
Push the ball neck in the direction of the
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arrow until it engages audibly behind the
bumper.
Indicator lamp 1 will go out and the mes‐
sage on the multifunction display will disap‐
pear.
Observe the information on the displays on the
instrument cluster:
Indicator and warning lamps (
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Display messages ( page 566)
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Coupling up / uncoupling a trailer
Requirements:
The ball neck is extended and engaged in a
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securely locked position
Trailers with a 7-pin plug can be connected to
the vehicle with the following adapters:
Adapter plug
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Adapter cable
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The trailer will be correctly detected by the vehi‐
cle only if the following conditions are met:
The trailer is connected correctly
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The trailer lighting system is in working order
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The functions of the following systems are affec‐
ted by a correctly connected trailer:
Active Lane Keeping Assist
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®
ESP trailer stabilisation
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Parking Assist PARKTRONIC
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Active Parking Assist
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page 623)
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Blind Spot Assist or Active Blind Spot Assist
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Drive Away Assist
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Cross Traffic Alert
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Reversing camera
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360° camera
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Coupling up a trailer
* NOTE Damage to the battery due to full
discharge
Charging the trailer battery using the power
supply of the trailer can damage the vehicle
battery.
Do not use the vehicle's power supply
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to charge the trailer battery.
Remove the cover from the ball head and
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store it in a safe place ( page 126).
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Position the trailer on a level surface behind
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the vehicle and couple it up to the vehicle.