Run-Flat System PAX, Examining Support Ring13-Pin« Trailer Socket
The backup lamps, »continuous current«
and charging cable can be used on the trailer with the
»13-pin« trailer socket. A
»13-pin« trailer socket is
recommended if a bicycle rack will be installed or a camper will
be towed.
  ...
Engine Cooling
Because towing places higher demands on the engine cooling
system, the cooling system is enhanced in vehicles that have
factory-installed trailer hitches, if necessary. This is done by
installing a stronger or a second coolant fan and/or a larger
radiato ...
Ignition lock
Fig. 107 Positions of the vehicle key in
the ignition lock
First read and observe the introductory information
and safety warnings The steering lock can be activated when
there is no vehicle key in the ignition lock.
Vehicle key positions
Ignition switched off. The vehicle key ca ...