Coupling Up A Trailer; Decoupling A Trailer - Mercedes-Benz A-Class Series Owner's Manual

Turn key : to the stop in the direction of
X
the arrow to lock.
Remove key :.
X
Press protective cap ; onto the lock.
X
i
You can store the key in the ball coupling
recess in the luggage compartment.
Fold trailer power socket : down.
X
G
Risk of accident
The ball coupling is only securely mounted
when the green mark on the handwheel is
aligned with the green area on the ball cou-
pling and the key can be removed. If the ball
coupling is not securely mounted, it may
come loose.
The ball coupling must be locked and the key
must be removed when towing a trailer. This
is the only way to guarantee that the ball cou-
pling is secured and cannot come loose while
the vehicle is in motion. If the ball coupling
cannot be locked and the key cannot be
removed, remove the ball coupling and clean
it.
If the ball coupling can still not be fitted
(locked) after it has been cleaned, remove the
ball coupling. The trailer coupling must then
not be used to tow a trailer, as safe operation
is not guaranteed.
Have the entire trailer coupling checked at a
qualified specialist workshop. Mercedes-
Benz recommends that you use a Mercedes-
Benz Service Centre for this purpose. In par-
ticular, work relevant to safety or on safety-
related systems must be carried out at a quali-
fied specialist workshop.

Coupling up a trailer

G Risk of injury
Do not disconnect a trailer with an engaged
overrun brake. Otherwise, your hand could
become trapped between the bumper and
trailer drawbar.
Make sure that the transmission is in posi-
X
tion P.
Apply the parking brake.
X
Position the trailer level behind the vehicle.
X
Couple up the trailer.
X
Establish the electrical connection
X
between the vehicle and the trailer.
Check that the trailer lighting system is
X
working.

Decoupling a trailer

G
Risk of injury
As soon as you raise the trailer drawbar, the
unladen vehicle rises slightly. The vehicle then
lowers to driving level.
Make sure that nobody is in the vicinity of the
wheel arch or the underbody. You could oth-
erwise trap yourself or others.
G Risk of injury
The vehicle is lowered as soon as you discon-
nect the trailer cable. Make sure that nobody
Trailer towing
Z
147