Mercedes-Benz A Series Owner's Manual page 193

Operation
Trailer towing*
note that the power output of the engine,
and consequently the vehicle's gradient-
climbing capability, decrease with increas-
ing altitude.
If the trailer swings from side to side:
Do not accelerate.
X
Do not counter-steer.
X
Brake if necessary.
X
G Risk of accident
On no account should you attempt to draw
the vehicle/trailer combination out by
increasing speed.
Removing the ball coupling
Pull the protective cap off the lock in the
X
handwheel.
Insert the key into the lock in the hand-
X
wheel.
Turn the key clockwise.
X
The lock is unlocked.
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.
190
Pull out the ball coupling downwards.
X
Clean the ball coupling if it is dirty.
X
Vehicles without ECO start/stop func-
X
tion*: open the stowage compartment on
the right of the luggage compartment.
Fold the trim downwards.
X
Vehicles with start/stop function*:
X
open the luggage compartment floor.
Remove the protective cap from the ball
X
coupling recess.
Press the protective cap into the ball cou-
X
pling recess until it engages.
Storing the ball coupling
Store the ball coupling with the key inser-
X
ted in the ball coupling recess.
Vehicle without ECO start/stop func-
X
tion: Secure the ball coupling in place using
the retainer strap.
G Risk of accident
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
Trailer power supply
When it leaves the factory, your vehicle's
trailer socket outlet is equipped with a per-
manent 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.
!
You can connect consumers with a power
rating of up to 240 W to the permanent
power supply and up to 180 W to the power
supply that is switched on via the ignition
lock.
You must not charge a trailer battery using
the power supply.
The trailer's turn signal lamps are only guar-
anteed to function when bulbs are used.
You can obtain further information about
installing the trailer electrics from a qualified
* optional