2018-2026 Mercedes B Class SUV Driving and parking -> Trailer hitch User Manual
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Driving and parking -> Trailer hitch for Your Mercedes B Class SUV Third Generation (2018-2026)

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The maximum articulation angle depends on
the length of the trailer. The system calculates
this by driving the vehicle forwards, including
cornering. Before the trailer length has been
calculated, the maximum articulation angle is
approximately 23°. The longer the trailer is,
the higher the maximum articulation angle
(max. approximately 60°).
%
Be aware of all surroundings and always
remain ready to brake.
Trailer hitch
Notes on trailer operation
*
NOTE The operating permit may be invali-
dated due to the illegal installation of
trailer hitches
The installation – including retrotting – of a
non-folding or non-removable trailer hitch that
even partially conceals the license plate or the
lighting system is prohibited.
#
Observe the applicable legal regulations
for the installation of trailer hitches.
&
WARNING Risk of accident due to car/
trailer combination swerving
If you drive too fast in trailer operation, the
car/trailer combination may start to swerve.
This could cause you to lose control of the
car/trailer combination. The car/trailer com-
bination may even overturn.
#
Under no circumstances should you try
to straighten the car/trailer combination
by increasing your speed.
#
Reduce the speed and do not counter-
steer.
#
Brake if necessary.
*
NOTE Damage to the engine due to over-
heating
#
If you have a trailer hitch retrotted,
modications to the engine cooling sys-
tem may be necessary depending on the
vehicle type.
If you have a trailer tow hitch retrotted,
observe the fastening points on the vehicle
frame.
Retrotting a trailer hitch is permissible only if a
trailer load is specied in your vehicle documents.
If this is not the case, the vehicle is not approved
for trailer operation.
Further information can be obtained at a qualied
specialist workshop.
Observe the following notes on the tongue weight:
R
do not use a tongue weight that exceeds or
falls below the permissible tongue weight
R
use a tongue weight as close as possible to
the maximum tongue weight
Do not exceed the following values:
R
Permissible trailer load
R
Permissible rear axle load of the towing vehi-
cle
R
Permissible gross mass of the towing vehicle
R
Permissible gross mass of the trailer
R
Maximum permissible speed of the trailer
Driving and parking
375
F247 0072 02
Ensure the following before starting a journey:
R
the tyre pressure on the rear axle of the tow-
ing vehicle is set for a maximum load
R
the lighting of the connected trailer is opera-
tional
R
vehicles without LED headlamps or MULTI-
BEAM LED headlamps: the headlamps have
been set correctly
In the event of increased rear axle load, the car/
trailer combination may not exceed a maximum
speed of 100 km/h for reasons concerning the
operating permit. This also applies in countries in
which the permissible maximum speed for car/
trailer combinations is above 100 km/h.
%
When you are reversing with a trailer, remem-
ber to use the Trailer Manoeuvring Assist
function (/ page 372).
Folding the ball neck out and in
&
WARNING Risk of accident due to the ball
neck not being engaged
If the ball neck is not engaged, the trailer may
come loose.
#
Always engage the ball neck as descri-
bed.
&
WARNING Risk of injury from ball neck
swinging outwards
The ball neck may swing outwards when
unlocking or when it has not been properly
engaged.
There is a risk of injury within the ball neck's
range of movement!
#
Unlock the ball neck only when its range
of movement is unobstructed.
#
Always be sure the ball neck is engaged
when folding inwards.
*
NOTE Increased risk of damage to prop-
erty due to folded-out ball neck
#
When the trailer is not coupled or the
bicycle rack is attached, fold in the ball
neck or, in the case of a fully electric
trailer hitch, retract the ball neck.
*
NOTE Damage to the vehicle due to incor-
rect use of the trailer hitch
If a trailer hitch is used to recover the vehicle,
the vehicle or the trailer hitch itself may be
damaged in the process.
#
Use the trailer hitch only for pulling a
trailer or attaching approved carrier sys-
tems (e.g. a bicycle rack).
Exception: Since vehicles with a trailer
hitch do not have a xture for a towing
eye at the rear, towing or tow-starting is
permitted.
#
When towing or tow-starting with the
trailer hitch, observe the information in
the section "Fitting and removing the
towing eye."
376
Driving and parking
F247 0072 02
Folding the ball neck out
#
Secure the vehicle against rolling away.
#
Keep the swivel range clear.
#
Remove the trailer cable or adapter plug.
#
Pull switch 2 until the ball neck unlocks.
The ball neck will fold out from under the rear
bumper.
Indicator lamp
1 will ash.
#
Pull the ball neck in the direction of the arrow
until it engages audibly in a vertical position.
Indicator lamp
1 on the ball neck release
switch will go out.
If the ball neck is not securely locked in place,
a message reading
Trailer coupling Check
lock
will appear on the driver's display.
#
Remove the cover cap from the ball head and
store it in a safe place.
Make sure that the ball on the ball neck is clean.
Check that it is either greased or dry (grease-
free), depending on the instructions for the trailer.
Folding the ball neck in
#
Pull switch 2 until the ball neck unlocks.
The ball neck will fold up under the rear
bumper.
Indicator lamp
1 will ash.
Driving and parking
377
F247 0072 02
#
Push the ball neck in the direction of the
arrow until it engages audibly behind the
bumper.
Indicator lamp
1 will go out and the message
on the driver's display will disappear.
Observe the information about indicators on the
driver's display:
R
Indicator and warning lamps (/ page 821)
R
Display messages (/ page 740)
Coupling up/uncoupling a trailer
The trailer will be correctly detected by the vehi-
cle only if the following conditions are met:
R
The ball neck is extended and engaged in a
securely locked position.
Trailers with a 7-pin plug can be connected to the
vehicle with the following adapters:
R
adapter plug
R
adapter cable
The trailer will be correctly detected by the vehi-
cle only if the following conditions are met:
R
the trailer is connected correctly
R
the trailer lighting system is in working order
A correctly connected trailer inuences, among
other things, the functions of the following sys-
tems:
R
ESP
®
trailer stabilisation
R
Trailer Manoeuvring Assist
R
Active Lane Keeping Assist
R
Parking Assist PARKTRONIC
R
Active Parking Assist
R
Blind Spot Assist
R
Drive Away Assist
R
Cross Trac Alert
R
Manoeuvring brake function
R
Reversing camera
R
360° Camera
Coupling up a trailer
*
NOTE Damage to the starter battery due
to full discharge
Charging the trailer battery using the power
supply of the trailer can damage the starter
battery.
#
Do not use the vehicle's power supply to
charge the trailer battery.
#
Secure the vehicle against rolling away.
378
Driving and parking
F247 0072 02
#
Remove the cover cap from the ball head and
store it in a safe place.
#
Position the trailer on a level surface behind
the vehicle and couple it up to the vehicle.
#
Open the socket cap.
#
Insert the plug with lug 1 in groove 3 on
the socket.
#
Turn bayonet coupling 2 to the right as far as
it will go.
#
Let the cap engage.
#
Secure the cable to the trailer with cable ties
(only if you are using an adapter cable).
#
Make sure that the cable is always slack for
ease of movement during cornering.
In the following circumstances, a message may
appear on the driver's display even if the trailer
has been connected correctly:
R
LEDs have been installed in the trailer lighting
system.
R
The current has fallen below the trailer lighting
system's minimum current (50 mA).
%
Accessories can be connected to the perma-
nent power supply up to 180 W and to the
power supply that is switched on via the igni-
tion lock.
Uncoupling a trailer
&
WARNING Risk of being crushed and
becoming trapped when uncoupling a
trailer
When uncoupling a trailer with an engaged
inertia-activated brake, your hand may
become trapped between the vehicle and the
trailer drawbar.
#
Do not uncouple trailers with an engaged
overrun brake.
*
NOTE Damage during uncoupling with an
engaged overrun brake
The vehicle may be damaged if you uncouple
with an engaged overrun brake.
#
Do not uncouple trailers with an engaged
overrun brake.
#
Secure the vehicle against rolling away.
#
Disconnect the electrical connection between
the vehicle and the trailer.
#
Uncouple the trailer.
#
Place the cover on the ball head.
%
Trailers with LED lighting: aer uncoupling the
trailer, switch the vehicle on and then o
again.
Driving and parking
379
F247 0072 02

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