Mercedes-Benz E-CLASS 2009 Manual page 241

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Trailer towing
238
Grasp release wheel ; with your hand
X
such that the thumb is in the thumb rest
and turn it anti-clockwise.
The ball coupling unlocks and lowers. Indi-
cator lamp : flashes.
Press the ball coupling in the direction of
X
the arrow until it engages behind the
bumper.
Indicator lamp : goes out and the mes-
sage in the multi-function display disap-
pears.
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 permanent power supply is
switched off in the event of low vehicle supply
voltage and after six hours at the latest.
Version: 2.11.8.1
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 connected power supply
X
on or off: turn the key in the ignition lock
to position 2 or 0, respectively.
Bulb failure indicator for LEDs
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 –
if the corresponding LED chain's current
draw drops below 50 milliamperes (mA).
To ensure reliable operation of the bulb failure
indicator, a minimum current of 50 mA must
be guaranteed by the manufacturer of each
LED chain in the trailer lighting.
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.
Fitting the adapter