Mercedes-Benz 2013 GLS Class - Manual (Page 240)

The release wheel is located behind the left-
hand side trim panel in the boot/luggage
compartment.
To open the cover:
X Turn handle : anti-clockwise and fold
down cover ;.
CLS Shooting Brake
To unlock and lower the ball coupling:
X Grasp release wheel ? with your hand
such that the thumb is in the thumb rest
and turn it anti-clockwise.
The ball coupling unlocks and lowers. Indi-
cator lamp = flashes.
X Press the ball coupling in the direction of
the arrow until it engages behind the
bumper.
Indicator lamp = goes out and the mes-
sage in the multifunction display disap-
pears.
i Fold the ball coupling back in if you are
not using the trailer tow hitch.
Trailer power supply
! You can connect accessories with a
power rating of up to 240 W to the perma-
nent power supply and with a power rating
of up to 180 W to the power supply that is
switched on via the ignition lock.
The trailer battery may not be charged from
the power supply.
X To switch the connected power supply
on or off: turn the key in the ignition lock
to position 2 or 0 respectively
( Y page 157).
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.
The trailer's permanent power supply is
switched off in the event of low vehicle supply
voltage and after six hours at the latest.
You can find more information about instal-
ling the trailer electrics at a qualified special-
ist workshop.
Bulb failure indicator for LED lamps
i If LED lamps are fitted in the trailer, an
error message may appear in the multi-
function display even if there is no fault. The
reason for the error message could be that
the current has fallen below the minimum
of 50 mA.
To ensure reliable operation of the bulb failure
indicator, each LED chain in the trailer lighting
must be guaranteed a minimum current of
50 mA.
238
Towing a trailer
Driving and parking