Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 305

302 Driving and parking
Open the socket cap.
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Insert the plug with lug 1 into groove
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the socket.
Turn bayonet coupling 2 to the right as far as
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it will go.
Let the cap engage.
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Secure the cable to the trailer with cable ties
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(only if you are using an adapter cable).
Make sure that the cable is always slack for
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ease of movement during cornering.
In the following circumstances, a message may
appear on the driver's display even if the trailer
has been connected correctly:
LEDs have been installed in the trailer lighting
R
system.
The current has fallen below the trailer lighting
R
system's minimum current (50 mA).
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Accessories can be connected to the perma-
nent power supply up to 180 W and to the
power supply that is switched on via the igni-
tion lock.
3 on
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 engaged
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overrun brake.
* NOTE Damage during uncoupling with an
engaged overrun brake
The vehicle may be damaged if you uncouple
with an engaged overrun brake.
Do not uncouple trailers with an engaged
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overrun brake.
& WARNING Risk of becoming trapped when
disconnecting the trailer cable
Vehicles with rear axle level control system:
the vehicle may lower when you disconnect
the trailer cable.
This could result in other people becoming
trapped if their limbs are between the vehicle
body and the tyres or underneath the vehicle.
Make sure nobody is underneath the
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vehicle or in the immediate vicinity of the
wheel arches when you disconnect the
trailer cable.
Secure the trailer against rolling away.
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