Mercedes-Benz GLK 300 4MATIC 2012 Owner's Manual page 223

Towing a trailer
220
Coupling up 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.
Make sure that the transmission is in posi-
X
tion P.
Engage the parking brake.
X
Position the trailer level behind the vehicle.
X
Couple up the trailer.
X
Establish the electric connection between
X
the vehicle and the trailer.
Check that the trailer lighting system is
X
working.
Uncoupling a trailer
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 rebound-
ing of the overrun brake.
Make sure that the transmission is in posi-
X
tion P.
Engage the parking brake.
X
Secure the trailer against rolling away.
X
Remove the trailer cable and decouple the
X
trailer.
Removing the ball coupling
Pull the protective cap off the lock in the
X
handwheel.
Use the key to unlock the lock in the hand-
X
wheel.
Hold the ball coupling. Pull the handwheel
X
away from the ball coupling and turn it
clockwise until it engages.
The green area on the ball coupling is
aligned with the red mark on the hand-
wheel.
Pull the ball coupling downwards to
X
remove.
Clean the ball coupling if it is dirty.
X
Information on cleaning and care of the trailer
tow hitch can be found under (
Storing the ball coupling
G WARNING
Never transport an unsecured ball coupling in
the interior of the vehicle.
Otherwise, vehicle occupants could be
injured by the ball coupling being thrown if
you:
brake sharply
R
change direction suddenly
R
have an accident
R
Open the stowage well under the luggage
X
compartment floor.
Remove the cover from the ball coupling
X
recess.
Remove the protective cap from the ball
X
coupling recess.
Press the protective cap into the ball cou-
X
pling recess until it engages.
Make sure that the protective cap is firmly
X
in place.
Store the ball coupling with the key inser-
X
ted in the ball coupling recess.
page 321).
Y