is in the vicinity of the wheel arch or the
underbody. You could otherwise trap yourself
or others.
As soon as you decouple the trailer, the unla-
den vehicle rises slightly. Make sure that you
or others are not injured in the process.
!
Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound-
ing of the overrun brake.
X
Make sure that the transmission is in posi-
tion P.
X
Apply the parking brake.
X
Secure the trailer against rolling away.
X
Remove the trailer cable and decouple the
trailer.
Removing the ball coupling
X
Pull the protective cap off the lock in the
handwheel.
X
Use the key to unlockthe lock in the hand-
wheel.
X
Hold the ball coupling. Pull the handwheel
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.
X
Pull out the ball coupling downwards.
X
Cleanthe ball coupling if it is dirty.
Information on cleaning and care of the trailer
tow hitch can be found at (Y page 217).
Storing the ball coupling
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:
R
brake sharply
R
change direction suddenly
R
have an accident
X
Vehicles without ECO start/stop func-
tion: open the stowage compartmenton
the rightofthe luggage compartment.
X
Fold the trim downwards.
X
Vehicles with start/stop function: open
the luggage compartmentfloor.
X
Remove the protective cap fromthe ball
coupling recess.
X
Store the ball coupling with the key inser-
ted in the ball coupling recess.
X
Vehicles without ECO start/stop func-
tion: secure the ball coupling in place using
the fastening strap.
X
Fold the trailer power socket upwards.
Trailer 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.
!
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
specialist workshop, e.g. aMercedes-Benz
Service Centre.
148
Trailer towing
Driving and parking
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