Mercedes-Benz A-Class Owner's Manual page 238

Coupling up a trailer
* NOTE Damage to the vehicle 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
#
to charge the trailer battery.
Remove the cover from the ball head and
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store it in a safe place ( page 98).
→
Position the trailer on a level surface behind
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the vehicle and couple it up to the vehicle.
Open the socket cap.
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Insert the plug with lug 1
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the socket.
Turn bayonet coupling 2 clockwise 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.
A display message may appear on the multifunc‐
tion display even if the trailer has been connec‐
ted correctly:
LEDs have been installed in the trailer light‐
R
ing system
The current has fallen below the trailer light‐
R
ing system's minimum current (50 mA).
% 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.
Uncoupling a trailer
in groove 3 on
& 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 overrun brake.
Secure the trailer against rolling away.
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Disconnect the electrical connection
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between the vehicle and the trailer.
Uncouple the trailer.
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Place the cover on the ball head.
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Driving and parking 235