Mercedes-Benz R-Class Owner's Manual page 244

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 red area on the handwheel is aligned
with the white dot on the ball coupling.
Pull out the ball coupling downwards.
X
Clean the ball coupling if it is dirty.
X
Press the protective cap into the ball cou-
X
pling recess until it engages.
Make sure that the protective cap is firmly
X
seated.
Replace the cover.
X
Storing the ball coupling
Place the ball coupling with the key inser-
X
ted in the ball coupling stowage compart-
ment in the stowage well under the luggage
compartment floor.
G Risk of accident
Do not carry the ball coupling in the vehicle
interior if it is not secured.
* optional
Otherwise, you and others could be injured
by the ball coupling being thrown around if
you:
brake sharply
R
change direction suddenly
R
are involved in an accident
R
Information on cleaning and care of the trailer
coupling can be found at ( page 248).
Y
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.
Trailer towing*
You can obtain further information about
installing the trailer electrics from a qualified
specialist workshop, e.g. a Mercedes-Benz
Service Centre.
To switch the switched power supply on
X
or off: turn the key in the ignition lock to
position 2 or 0, respectively.
Trailer with 7-pin connector
If your trailer has a 7-pin connector, you can
connect it to the 13-pin socket on the ball
coupling using an adapter or, if necessary, an
adapter cable. Both of these can be obtained
at a qualified specialist workshop, e.g. at a
Mercedes-Benz Service Centre.
Operation
Z
241