
Swinging out using the switch in the tail-
gate:
X Make sure that the vehicle is stationary.
X Open the tailgate.
X Pull switch :briefly.
After a short time the ball coupling swings out from under the rear bumper. It can take up to
seven seconds before the ball coupling visibly
swings out.
X Remove the protective covering from the ball
coupling and store it in a safe place.
Until the ball coupling securely engages and
locks in a vertical position:
R indicator lamp ;flashes
R the multifunction display shows the display
message Trailer coupling extend‐ Trailer coupling extend‐
ing...
ing....
The ball coupling swivels back into the out-of-
use position when:
R you drive off before the Trailer Trailercoupling
coupling
extending...
extending... display message has disap-
peared from the multifunction display
R the ball coupling encounters an obstacle in
the swinging range
Further information:
R Display messages when towing a trailer
(Y page 332)
R Problems when swivelling the ball coupling
(Y page 279) Coupling up a trailer
Important safety notes G
WARNING
Vehicles with level control: If you disconnect the trailer cable, the vehicle
is lowered. This can cause you or others to
become trapped between the vehicle body
and tyres, or underneath the vehicle. This
poses a risk of injury.
Make sure that no-one is in the immediate
vicinity of the wheel arch or underneath the
vehicle when disconnecting the trailer cable.
Steel-sprung vehicles X
Shift the transmission to position P.
X Apply the electric parking brake.
X Position the trailer horizontally behind the
vehicle.
X Couple up the trailer.
X Establish the electrical connection between
the vehicle and the trailer.
X Check that the trailer lighting system is work-
ing.
Vehicles with the AIRMATIC package !
Before beginning the journey, make sure
that the trailer support wheel is completely
raised. Otherwise, the trailer or the vehicle
could be damaged by the lowered trailer sup- port wheel during the journey.
X Shift the transmission to position P.
X Apply the electric parking brake.
X Start the engine.
X Vehicles with the Off-Road Engineering
package:
set the vehicle level to normal level
(Y page 216).
X Vehicles without the Off-Road Engineer-
ing package:
select theComfortdrive pro-
gram using the DYNAMIC SELECT controller
(Y page 221).
X Switch off the engine.
X Close the doors and tailgate.
X Position the trailer horizontally behind the
vehicle.
X Couple up the trailer.
X Establish the electrical connection between
the vehicle and the trailer. Towing a trailer
275Driving and parking Z

X
Check that the trailer lighting system is work-
ing.
X Push the combination switch upwards and
downwards and check whether the corre-
sponding turn signal on the trailer is flashing.
A connected trailer is only detected when the
electrical connection is established correctly
and when the lighting system is working prop-
erly. The function of other systems also depends on this, for example:
R ESP ®
R PARKTRONIC
R Active Parking Assist
R Active Blind Spot Assist
R Active Lane Keeping Assist
i Vehicles with the AIRMATIC package:
if
you couple up a trailer, the vehicle initially
remains at the selected level of the drive pro- gram set. Observe the following when cou-
pling up a trailer:
R If the normal level was not selected previ-
ously, the vehicle automatically adopts the
normal level starting from a speed of
30 km/h. Even at higher speeds, it does not drop below the normal level.
R Vehicle levels below the normal level are
not available.
R The raised level is available up to a speed of
30 km/h.
R This also applies when using accessories
that are plugged into the socket of the
trailer tow hitch (e.g. a bicycle rack).
R Before driving with a trailer, please observe
the information on the trailer support
wheel. Uncoupling a trailer
Important safety notes G
WARNING
If you uncouple a trailer with an engaged over- run brake, you could trap your hand between
the vehicle and the trailer drawbar. This poses a risk of injury.
Do not uncouple a trailer with an engaged
overrun brake. G
WARNING
Vehicles with level control:
If you disconnect the trailer cable, the vehicle is lowered. This can cause you or others to
become trapped between the vehicle body
and tyres, or underneath the vehicle. This
poses a risk of injury.
Make sure that no-one is in the immediate
vicinity of the wheel arch or underneath the
vehicle when disconnecting the trailer cable.
! Do not disconnect a trailer with an engaged
overrun brake. Otherwise, your vehicle could
be damaged by the rebounding of the overrun
brake.
! Remove the adapter cable before folding in
the ball coupling. You could otherwise dam-
age the rear bumper and the adapter cable.
Steel-sprung vehicles X
Shift the transmission to position P.
X Apply the electric parking brake.
X Secure the trailer against rolling away.
X Remove the trailer cable and decouple the
trailer.
Vehicles with the AIRMATIC package X
Shift the transmission to position P.
X Apply the electric parking brake.
X Start the engine.
X Close the doors and tailgate.
X Secure the trailer against rolling away.
X Remove the trailer cable and decouple the
trailer.
X Switch off the engine. Swinging the ball coupling in
! Do not attempt to speed the up the swing-
out procedure by applying additional pressure
with your foot. The system could otherwise be
mechanically damaged. 276
Towing a trailerDriving and parking

The trailer battery may not be charged from
the power supply.
When it leaves the factory, your vehicle's trailer
socket is equipped with a permanent 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.
The trailer's permanent power supply is
switched off in the event of low vehicle supply
voltage and after six hours at the latest.
You can find more information about fitting the
trailer electrics at a qualified specialist work-
shop.
X To switch the connected power supply on
or off: turn the key to position 2or 0respec-
tively (Y page 158). Failure check for LEDs
If LED lamps are fitted in the trailer, a malfunc-
tion message may appear in the multifunction
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 mA.
To ensure reliable indication of the failure, each LED chain in the trailer lighting must be guaran-
teed a minimum current of 50 mA. Trailer with 7-pin connector
General notes Trailer with 7-pin connector:
you can connect
to the 13-pin socket on the ball coupling using
an adapter or, if necessary, an adapter cable.
Both can be obtained at a qualified specialist
workshop.
Fitting the adapter !
Make sure that there is sufficient cable play
so that the cable cannot become detached
when cornering.
! Remove the adapter cable before folding in
the ball coupling. You could otherwise dam-
age the rear bumper and the adapter cable. X
Open the socket cover.
X Insert the plug connector with lug :into
groove =on the socket.
X Turn bayonet connection ;clockwise to the
stop.
X Let the cover engage.
X If you are using an adapter cable, secure the
cable to the trailer with cable ties. 278
Towing a trailerDriving and parking

Useful information
i This Owner's Manual describes all models,
series and optional equipment for your vehi-
cle that were available at the time of going to
press. National variations are possible. Note
that your vehicle may not be equipped with all
of the functions described. This is also the
case for systems and functions relevant to
safety.
i Read the information on qualified specialist
workshops: (Y page 28). Important safety notes
G
WARNING
Operating the integrated information systems and communications equipment in the vehicle
while driving will distract you from traffic con-
ditions. You could then lose control of the
vehicle. There is a risk of an accident.
Only operate these devices if road traffic con-
ditions permit. If you are unsure about the
surrounding conditions, pull over to a safe
location and make entries only while the vehi-
cle is stationary.
You must observe the legal requirements for the country in which you are currently driving whenoperating the on-board computer.
PLUG-IN HYBRID vehicles only: G
WARNING
If the instrument cluster has failed or there is a malfunction, you may not know about
safety-related function restrictions. The oper-ating safety of your vehicle may be affected.
There is a risk of an accident.
Immediately stop the vehicle while paying
attention to the traffic conditions and consult
a qualified specialist workshop.
All vehicles, except PLUG-IN HYBRID vehi-
cles:
The on-board computer only shows messages or warnings from certain systems in the multifunc-
tion display. You should therefore make sure
your vehicle is operating safely at all times. For an overview, see the instrument cluster illus-
tration (Y page 32). Displays and operation
Instrument cluster lighting
The lighting in the instrument cluster, in the dis- plays and the controls in the vehicle interior can
be adjusted using the brightness control knob.
The brightness control knob is located on the
bottom left of the instrument cluster
(Y page 32).
X Turn the brightness control knob clockwise or
anti-clockwise.
If you turn the light switch to Ã,Tor
L, the brightness is dependent upon the
brightness of the ambient light.
i The light sensor in the instrument cluster
automatically controls the brightness of the
multifunction display.
In daylight, the displays in the instrument
cluster are not illuminated. Speedometer with segments
The speedometer is divided into segments only
on vehicles with DISTRONIC PLUS.
The segments in the speedometer indicate
which speed range is available.
R Variable SPEEDTRONIC activated
(Y page 205):
The segments light up from the start of the
scale to the selected limit speed.
R DISTRONIC PLUS activated (Y page 207):
One or two segments in the set speed range
light up.
R DISTRONIC PLUS detects a vehicle in front
moving more slowly than the stored speed:
The segments between the speed of the vehi- cle in front and the stored speed light up. Rev counter
! Do not drive in the overrevving range. Doing
so will damage the engine.
The red band in the rev counter indicates the
engine's overrevving range. Displays and operation
281On-board computer and displays Z

Displaying the coolant temperature
The
Coolant
Coolant menu is only available on PLUG-IN
HYBRID vehicles.
Observe the notes on coolant temperature
(Y page 282).
X Press the =or; button on the steering
wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Serv.
Serv. submenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select the
Coolant
Coolant submenu.
X Press ato confirm your selection.
The coolant temperature is shown in a bar
display. Settings menu
Introduction Depending on the equipment fitted in the vehi-
cle, In the
Settings Settings menu you have the follow-
ing options:
R To change the HYBRID settings (PLUG-IN
HYBRID vehicles) (Y page 292)
R To change the instrument cluster settings
(Y page 293)
R To change the light settings (Y page 293)
R To change the vehicle settings
(Y page 294)
R To change the heating settings
(Y page 295)
R To change the convenience settings
(Y page 296)
R To restore the factory settings (Y page 297)HYBRID submenu (PLUG-IN HYBRID
vehicles) Setting the maximum charge current
Using the Maximum charge current Maximum charge current function,
you can limit the charge current value at which
the high-voltage battery should be charged.
Before charging the high-voltage battery at a
power socket, check the maximum permissible
charge current for the relevant power socket or the building.
Only set the maximum permissible charge cur-
rent using the function if:
R it is not possible to set the charge current on
the charging cable
R the precise maximum permitted charge cur-
rent can only be set via the on-board com-
puter
Before charging the high-voltage battery at a
wallbox or charging station, ensure that the
charging current is not limited by the function. If charging at a wallbox or a charging station,
select the maximum value.
Further information on charging the high-volt-
age battery and setting the charge current
(PLUG-IN HYBRID vehicles) (Y page 183).
X Press the =or; button on the steering
wheel to select the Settings
Settings menu.
X Press the :or9 button to select the
Hybrid Hybrid submenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select the
Maximum charge current:
Maximum charge current: function.
You will see the selected setting.
X Press the abutton to save the setting.
The maximum charge current values in the on- board computer may deviate from the charg-
ing cable values.
Further information on charging the high-volt-
age battery (PLUG-IN HYBRID vehicles)
(Y page 183).
Setting the departure time
You can use the "Set departure time" function to
climatise the vehicle interior before departure.
Further information on pre-entry climate control
(Y page 148).
If you recharge the high-voltage battery, the
function also displays the charging prediction. 292
Menus and submenusOn-boa
rdcompu ter and displays

X
Press the =or; button on the steering
wheel to select the Settings
Settings menu.
X Press the :or9 button to select the
Hybrid
Hybrid submenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select the
Departure time:
Departure time: function.
You will see the selected setting.
X To set no departure time: press the:or
9 button to select No preselection
No preselection.
X Press ato confirm.
If you recharge the high-voltage battery, the
multifunction display also shows the time
when the high-voltage battery will be fully
charged.
or X To set a departure time: press:or9
A
A, B Bor C
Cto select the desired preset.
X Press ato confirm the selection.
X Press :or9 to set the hours.
X Press ato confirm.
X Press :or9 to set the minutes.
X Press ato confirm.
If you recharge the high-voltage battery, the
multifunction display shows the expected
charge status of the high-voltage battery for
the departure time set.
Further information on charging the high-volt-
age battery (PLUG-IN HYBRID vehicles)
(Y page 183).
Instrument cluster submenu Selecting the distance unit
The Display unit Speed-/odometer: Display unit Speed-/odometer: func-
tion allows you to choose whether certain dis-
plays appear in kilometres or miles in the mul-
tifunction display.
X Press the =or; button on the steering
wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Instrument cluster
Instrument cluster submenu.
X Press ato confirm.
X Press the :or9 button to select the
Display unit Speed-/odometer
Display unit Speed-/odometer function.
You will see the selected setting: km
km ormiles miles.
X Press the abutton to save the setting. The selected unit of measurement for distance
applies to the:
R digital speedometer in the Trip Tripmenu
R total distance recorder and the trip meter
R trip computer
R current consumption and the range
R navigation instructions in the Navi
Navimenu
R cruise control
R SPEEDTRONIC
R DISTRONIC PLUS
R ASSYST PLUS service interval display
Selecting permanent display
United Kingdom: this function is unavailable.
The Permanent display: Permanent display: function allows you
to choose whether the multifunction display
always shows the outside temperature or the
speed.
The speed display is inverse to your speedome- ter.
X Press the =or; button on the steering
wheel to select the Settings
Settings menu.
X Press the :or9 button to select the
Instrument cluster Instrument cluster submenu.
X Confirm by pressing aon the steering
wheel.
X Press the :or9 button to select the
Permanent display:
Permanent display: function.
The current setting, outside temperature
outside temperature
or Dig. speedo [mph]:
Dig. speedo [mph]:, appears.
X To change the setting: pressaagain.
Light submenu Setting the daytime driving lights
The Daytime driving lights
Daytime driving lights function can
only be switched on with the engine turned off.
X Press the =or; button on the steering
wheel to select the Settings
Settings menu.
X Press the :or9 button to select the
Lights
Lights submenu.
X Press ato confirm.
X Press the :or9 button to select the
Daytime driving lights
Daytime driving lights function.
If the Daytime
Daytime driving
drivinglights
lightsfunction has
been switched on, the cone of light and the
W symbol in the multifunction display are
shown in orange.
X Press the abutton to save the setting. Menus and submenus
293On-board computer and displays Z

Further information on daytime driving lights
(Y page 122).
Switching the Intelligent Light System
on/off
X Press the =or; button on the steering
wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Lights
Lights submenu.
X Press ato confirm.
X Press the :or9 button to select the
Intell. Light System
Intell. Light System function.
If the Intell. Light System
Intell. Light System function has
been switched on, the cone of light and the
L symbol in the multifunction display are
shown in orange.
X Press the abutton to save the setting.
When you switch the Intell. Light System
Intell. Light System
function on, you activate the following func-
tions:
R Motorway mode
R Active light function
R Cornering light function
R Extended range foglamps
R Off-road lights
If you set the dipped-beam headlamps for driv-
ing on the right/left, the multifunction display
shows the Intell. Light System: system
Intell. Light System: system
inoperative Inactive for left-side inoperative Inactive for left-side
traffic traffic orIntell.
Intell. Light
LightSystem:
System: System
System
inoperative Inactive for right-side
inoperative Inactive for right-side
traffic traffic display message instead of the
Intell.
Intell. Light
LightSystem
System function in the Lights
Lights
submenu (Y page 294). This display message
will only appear if the setting for driving on the
left/right is set opposite to your vehicle's coun-
try version.
Further information on the Intelligent Light Sys-
tem (Y page 124).
Setting the dipped-beam headlamps for
driving on the left/right
This function is only available in vehicles with
the Intelligent Light System.
You can use this function to switch between
symmetrical and asymmetrical dipped beam
(Y page 121).
X Press the =or; button on the steering
wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Lights
Lights submenu. X
Press ato confirm.
X Press the :or9 button to select the
Dipped beams Setting for: Dipped beams Setting for: function.
You will see the selected setting: Right- Right-
side traffic
side traffic orLeft-side traffic
Left-side traffic.
X Press the abutton to save the setting.
If you change the setting, conversion does not
take place until the next time the vehicle is
stationary.
If you set the dipped-beam headlamps for driv-
ing on the right/left, then motorway mode and
the extended range foglamps are unavailable.
These are only deactivated if the setting for driv-
ing on the left/right is set opposite to your vehi- cle's country version.
A qualified specialist workshop can set the
dipped-beam headlamps for driving on the left/
right.
Vehicle submenu Setting permanent SPEEDTRONIC
X Press the =or; button on the steering
wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Vehicle
Vehicle submenu.
X Press ato confirm.
X Press :or9 to select the Limit
Limit
speed (winter tyres):
speed (winter tyres): function.
You will see the current setting.
X Press ato confirm.
X Press the :or9 button to adjust per-
manent SPEEDTRONIC in increments of ten
(240 km/h 240 km/h to160 km/h 160 km/h ). TheOff
Offsetting
switches permanent SPEEDTRONIC off.
X Press the abutton to store the entry.
For further information on permanent SPEED-
TRONIC (Y page 207).
Activating/deactivating the automatic
locking feature If you activate the Automatic door locks Automatic door locks
function, the vehicle is centrally locked above a
speed of approximately 15 km/h.
X Press the =or; button on the steering
wheel to select the Settings
Settingsmenu.
X Press the :or9 button to select the
Vehicle
Vehicle submenu.
X Press ato confirm. 294
Menus and submenusOn-board computer and displays

X
Press the :or9 button to select the
Automatic door locks
Automatic door locks function.
When the Automatic
Automatic door
doorlocks
locks function is
activated, the vehicle doors are displayed in
orange in the multifunction display.
X Press the abutton to save the setting.
For further information on the automatic locking
feature; see (Y page 92).
Activating/deactivating the acoustic
locking confirmation
If you switch on the Acoustic
Acoustic Lock Lockfunction, an
acoustic signal sounds when you lock the vehi-
cle.
X Press the =or; button on the steering
wheel to select the Settings
Settings menu.
X Press the :or9 button to select the
Vehicle
Vehicle submenu.
X Press ato confirm.
X Press the :or9 button to select the
Acoustic Lock Acoustic Lock function.
If the Acoustic Lock
Acoustic Lock function is activated,
the & symbol in the multifunction display
lights up orange.
X Press the abutton to save the setting.
Heating submenu Auxiliary heating departure time
G
DANGER
If the exhaust pipe is blocked or sufficient
ventilation is not possible, toxic exhaust
fumes can enter the vehicle, especially car-
bon monoxide. This is the case, e.g. in
enclosed spaces, or if the vehicle is stuck in
snow. There is a risk of fatal injuries.
You should switch off the auxiliary heating in
enclosed spaces which do not have an extrac- tion system, e.g. a garage. If the vehicle is
stuck in snow and you must leave the auxiliary
heating running, keep the exhaust pipe and
the area around the vehicle clear of snow. To guarantee a sufficient supply of fresh air, open
a window on the side of the vehicle away from the wind. G
WARNING
When the auxiliary heating is switched on,
parts of the vehicle can become very hot.
Flammable materials such as leaves, grass or twigs may ignite if they come into contact
with:
R hot parts of the exhaust system
R the exhaust gas itself
There is a risk of fire.
When the auxiliary heating is switched on,
make sure that:
R no flammable materials come into contact
with hot vehicle components
R the exhaust gas can escape from the
exhaust pipe unhindered
R the exhaust gas does not come into contact
with flammable materials.
! Operating the auxiliary heating/ventilation
draws on the vehicle battery. After you have
heated or ventilated the vehicle a maximum of two times, drive for a longer distance.
Only vehicles with auxiliary heating have this
function.
In the Heating Heating submenu, you can select a
stored departure time or change a departure
time.
The auxiliary heating timer function calculates
the switch-on time according to the outside
temperature so that the vehicle is preheated by the departure time. When the departure time isreached, the auxiliary heating continues to heat
for a further five minutes and then switches off. The auxiliary heating adopts the THERMATIC orTHERMOTRONIC temperature setting.
You can switch off the auxiliary heating by using
the remote control or the auxiliary heating but-
ton on the centre console.
i Switch the auxiliary heating on regularly
once a month for about ten minutes.
Further information on auxiliary heating
(Y page 149). Menus and submenus
295On-board computer and displays Z