Mercedes-Benz S-Class 2020 Owner's Manual page 517

514 Display messages and warning/indicator lamps
Display messages
d
Vehicle is operational
Switch off ignition before
exiting
ï
Operation only possible in
transmission position P
ï
Trailer coupling in motion
ï
Check trailer hitch lock
Possible causes/consequences and
* You are leaving the vehicle in a ready-to-drive state.
When you leave the vehicle, switch off the ignition, secure the vehicle against rolling away and take the key with
#
you.
If you do not leave the vehicle, switch off the electrical consumers, e.g. the seat heating. Otherwise, the 12 V
#
battery may discharge and it will then be possible to start the vehicle only with the aid of a second battery
(starting assistance).
* The ball neck will not swivel because transmission position h, k or neutral i is selected.
Depress the brake pedal.
#
Engage park position j.
#
* The ball neck will retract/extend.
Do not attempt to speed up, slow down or initiate the swivel movement using your hand, foot or other aids. During
the swivel movement, do not couple a trailer.
When the ball neck has reached an operational position, the display message will disappear.
* The trailer hitch is not operational during a journey with a trailer.
& WARNING Risk of an accident if the ball neck is not locked
The trailer may become detached.
M M Solutions