Mercedes-Benz M-Class Owner's Manual page 234

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 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 may be that
the current has fallen below the minimum
of 50 milliamperes (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.
Trailer with 7-pin connector
General information
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
Open the socket cover.
X
Insert the connector with lug : into
X
groove ; on the socket and turn the con-
nector clockwise to the stop.
Let the cover engage.
X
If you are using an adapter cable, secure
X
the cable to the trailer with cable ties.
! Make sure that there is sufficient cable
play so that the cable cannot become
detached when cornering.
Towing a trailer
Z
231