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Towing a trailer
216
A connected trailer is only detected when the
electrical connection is established correctly
and the lighting system is working properly. The
function of other systems also depends on this,
for example:
®
ESP
R
PARKTRONIC
R
Active Parking Assist
R
Active Blind Spot Assist
R
Active Lane Keeping Assist
R
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.
!
Remove the installed adapter cable before
folding in the ball coupling. Otherwise, dam-
age may occur to the rear bumper and the
adapter cable.
Apply the electric parking brake manually.
X
Vehicles with manual transmission:
X
depress the clutch pedal fully and engage first
or reverse gear.
Vehicles with automatic transmission:
X
shift the transmission to position P.
Switch off the engine.
X
Secure the vehicle and trailer against rolling
X
away.
Remove the trailer cable and uncouple the
X
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.
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 on-board voltage
and after six hours at the latest.
You can find more information about installing
the trailer electrics at a qualified specialist work-
shop.
To activate the switched power supply:
Turn the key to position 2 in the ignition lock
X
(
page 133).
Y
or
Press the Start/Stop button twice on vehicles
X
with KEYLESS-GO or the KEYLESS-GO start
function (
page 133).
Y
To deactivate the switched power supply:
Turn the key to position 0 in the ignition lock
X
(
page 133).
Y
or
Press the Start/Stop button once on vehicles
X
with KEYLESS-GO or the KEYLESS-GO start
function (
page 133).
Y
Failure check for LEDs
If LED lamps are fitted in the trailer, a malfunc-
tion message may appear in the multifunction
display even if there is no fault. The reason for
the error message may be that the current has
fallen below the minimum of 50 mA.
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