Mercedes-Benz V-Class 2021 Owner's Manual page 187

184 Driving and parking
Coupling a trailer
* NOTE Damage to the starter battery due
to full discharge
Charging the trailer battery using the power
supply of the trailer can damage the starter
battery.
Do not use the vehicle's power supply
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to charge the trailer battery.
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Eyelet for breakaway cable
The eyelet on the ball neck is used exclusively for
attaching the trailer breakaway cable. You must
not attach a tow rope, a tow bar or anything simi‐
lar to the eyelet. The eyelet has not been
designed for such a load and may tear.
Shift the transmission to position j.
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Apply the vehicle's parking brake.
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Close all the doors.
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Position the trailer on a level surface behind
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the vehicle.
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The height of the ball head will change
depending on the vehicle's load. In this case,
use a trailer with a height-adjustable draw‐
bar.
Couple up the trailer.
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To install an adapter: open the cover of the
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socket.
Insert plug 2 with tab
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groove 3.
Turn plug 2 clockwise as far as it will go.
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Let the cover engage.
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Attach the cable to the trailer with cable ties
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(only in the case of adapter cables).
Make sure that the cable is always slack for
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ease of movement during cornering.
Establish all electrical and other connections
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to the trailer. In the process, attach the trail‐
er's breakaway cable to the eyelet on the ball
neck.
Check that the trailer's lighting system works
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properly.
A trailer is detected only if the electrical con‐
nection is established correctly and the light‐
ing system is in working order. The function
of other systems also depends on this, e.g.
®
ESP , PARKTRONIC, Active Parking Assist,
Blind Spot Assist or Lane Keeping Assist.
Even if the trailer is connected correctly, a mes‐
sage may nevertheless appear on the multifunc‐
tion display in the following cases:
LEDs have been installed in the trailer's light‐
R
ing system.
The current has fallen below the trailer light‐
R
ing system's minimum current (50 mA)
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You can connect accessories up to a maxi‐
mum of 240 W to the permanent power sup‐
ply.
Remove objects or devices that prevent the
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trailer from rolling, e.g. chocks.
Release the trailer's parking brake.
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Uncoupling a trailer
& WARNING Risk of being crushed and
becoming trapped when uncoupling a
trailer
When uncoupling a trailer with an engaged
inertia-activated brake, your hand may
become trapped between the vehicle and the
trailer drawbar.
Do not uncouple trailers with an
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engaged overrun brake.
1 in the socket's