Folding in the ball coupling
i
Fold the ball coupling back in if you are not
using the trailer tow hitch.
X
Place the protective covering on the ball cou-
pling.
Opening the cover:
X
Turn handle
:
anti-clockwise and fold down
cover
;
.
Unlocking and lowering the ball coupling:
X
Pull out release wheel
?
.
X
Turn release wheel
?
anti-clockwise.
The ball coupling unlocks and lowers. Indica-
tor lamp
=
flashes.
X
Press the ball coupling in the direction of the
arrow until it engages behind the bumper.
Indicator lamp
=
goes out and the message
in the multifunction display disappears.
Coupling up a trailer
X
Make sure that the transmission is in position
P.
X
Apply the parking brake.
X
Position the trailer horizontally behind the
vehicle.
X
Couple up the trailer.
X
Establish the electric connection between the
vehicle and the trailer.
X
Check that the trailer lighting system is work-
ing.
A connected trailer is only recognised when
the electrical connection is established cor-
rectly and when the lighting system is working
properly. The function of other systems, such
as ESP
®
, PARKTRONIC and Active Parking
Assist also depends on this.
Uncoupling a trailer
G
WARNING
If you uncouple a trailer with an engaged over-
run brake, you could trap your hand between
the vehicle and the trailer drawbar. This poses
a risk of injury.
Do not uncouple a trailer with an engaged
overrun brake.
G
WARNING
Vehicles with level control:
If you disconnect the trailer cable, the vehicle
is lowered. This can cause you or others to
become trapped between the vehicle body
and tyres, or underneath the vehicle. This
poses a risk of injury.
Make sure that no-one is in the immediate
vicinity of the wheel arch or underneath the
vehicle when disconnecting the trailer cable.
!
Do not disconnect a trailer with an engaged
overrun brake. Otherwise, your vehicle could
be damaged by the rebounding of the overrun
brake.
X
Make sure that the transmission is in position
P.
X
Apply the parking brake.
X
Secure the trailer against rolling away.
X
Remove the trailer cable and decouple the
trailer.
Trailer power supply
!
You can connect accessories to the perma-
nent power supply up to a maximum of 240 W.
You cannot charge a trailer battery using the
power supply.
X
To switch the connected power supply on
or off: turn the key in the ignition lock to
position 2 or 0 respectively (
Y
page 139).
When it leaves the factory, your vehicle's trailer
socket is equipped with a permanent power
supply and a power supply that is switched on
via the ignition lock.
The permanent power supply is supplied via
trailer socket pin 9.
The power supply that is switched on via the
ignition lock is supplied via trailer socket pin 10.
The trailer's permanent power supply is
switched off in the event of low vehicle supply
voltage and after six hours at the latest.
You can find more information about fitting the
trailer electrics at a qualified specialist work-
shop.
Towing a trailer
211
Driving
and
parking
Z