Mercedes-Benz S-Class Owner's Manual page 297

Open the socket cap.
#
Insert the plug with lug 1 in groove
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the socket.
Turn the bayonet coupling 2 clockwise as
#
far as it will go.
Let the cap engage.
#
Secure the cable to the trailer with cable ties
#
(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.
Push the combination switch upwards/down‐
#
wards and check whether the corresponding
turn signal light on the trailer is flashing.
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.
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 overrun brake.
Driving and parking 295
& WARNING Risk of becoming trapped
when disconnecting the trailer cable
Vehicles with level control system: the
vehicle lowers when the trailer cable is dis‐
connected.
This could result in you or other people
becoming trapped if your or their limbs are
between the vehicle body and the tyres or
underneath the vehicle.
Make sure nobody is underneath the
#
vehicle or in the immediate vicinity of
the wheel arches when you disconnect
the trailer cable.
* NOTE Damage to the rear bumper from
installing adapter cables or adapter plugs
The following parts could be damaged when
retracting the ball neck:
bumper
R
adapter cable
R
adapter plug
R