Mercedes-Benz A Series 2015 Owner's Manual page 235

Towing a trailer
232
note that the power output of the engine,
and consequently the vehicle's gradient-
climbing capability, decrease with increas-
ing altitude.
Folding out the ball coupling
G WARNING
If the ball coupling is not correctly engaged,
the trailer can detach. There is a risk of an
accident.
Always engage the ball coupling as described.
G WARNING
If you release the ball coupling or it does not
engage correctly when folding in, it will swing
out. Within pivoting range of the ball coupling,
there is an increased risk of an accident and
injury.
Only release the ball coupling if the pivoting
range is unobstructed. Always make sure that
the ball coupling engages when folding in.
Before you can tow a trailer with your vehicle,
you must fold out the ball coupling.
The release wheel is located behind the left-
hand side panelling in the luggage compart-
ment.
To open the cover: turn handle : anti-
X
clockwise, the fold down and remove
cover ;.
Pull out release wheel =.
X
Turn release wheel = anti-clockwise as far
X
as it will go.
The ball coupling disengages and folds out
behind the rear bumper. Indicator lamp ?
flashes.
Pull the ball coupling in the direction of the
X
arrow until it engages in a vertical position.
The indicator lamp on the release wheel
goes out. The power socket folds down
automatically.
The multifunction display shows the
Check trailer Check trailer hitch hitch lock
sage until the ball coupling is engaged.
Remove the protective covering from the
X
ball coupling and store it in a safe place.
Make sure that the ball of the ball coupling
X
is clean and that it is either greased or dry
(grease free), depending on the instruc-
tions for the trailer.
lock display mes-