Mercedes-Benz GLC Owner's Manual page 310

Swinging in using the switch in the tail-
gate:
Make sure that the vehicle is stationary and
X
the trailer cables are disconnected.
Place the protective covering on the ball
X
coupling.
Open the tailgate.
X
Pull switch : briefly.
X
After a short time the ball coupling swings
in under the rear bumper. It can take up to
seven seconds before the ball coupling visi-
bly swings in.
Until the ball coupling securely engages and
locks under the bumper:
indicator lamp ; flashes.
R
the Trailer coupling Trailer coupling extending...
R
sage appears in the multifunction display.
The ball coupling swivels back into the out-of-
use position when:
switch : is pulled again briefly during
R
swivelling
you drive off before the
R
pling extending... pling extending...
disappeared from the multifunction display
the ball coupling encounters an obstacle in
R
the swinging range
extending...mes-
Trailer cou‐ Trailer cou‐
display message has
Further information:
Display messages when towing a trailer
R
( page 369)
Y
Problems when swivelling the ball coupling
R
( page 309)
Y
Problems when swivelling the ball coupling;
R
see the "Problems when towing a trailer"
section in the Digital Owner's Manual
Trailer power supply
! Accessories with a maximum power con-
sumption of 180 W can be connected to the
permanent power supply.
The trailer battery may not be charged from
the 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.
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 fitting
the trailer electrics at a qualified specialist
workshop.
To switch the connected power supply
X
on or off: turn the key to position 2 or 0
respectively ( page 187).
Y
Failure check for LEDs
If LED lamps are fitted in the trailer, a mal-
function message may appear in the multi-
function display even if there is no fault. The
reason for the error message may be that the
current has fallen below the minimum of
50 mA.
Towing a trailer
Z
307