
R
When you couple up a trailer, check at reg-
ular intervals that the load is firmly secured.If the trailer is equipped with trailer lights
and brakes, check the trailer to ensure that
these are working.
R Bear in mind that the handling will be less
stable when towing a trailer than when driv-
ing without one. Avoid sudden steering
movements.
R The vehicle/trailer combination is heavier,
accelerates more slowly, has a decreased
gradient climbing capability and a longer
braking distance.
It is more susceptible to side winds and
requires more careful steering.
R If possible, avoid abrupt braking. Depress
the brake pedal moderately at first, so that the trailer can activate its own brakes. Thenincrease the pressure on the brake pedal.
R If the automatic transmission repeatedly
shifts between gears on uphill or downhill
gradients, shift to a lower gear using the
left-hand steering wheel paddle shifter.
A lower gear and lower speed reduce the
risk of engine failure.
R When driving downhill, shift to a lower gear
to utilize the engine's braking effect.
Avoid continuous brake application as this
may overheat the vehicle brakes and, if
installed, the trailer brakes.
R If the coolant temperature increases dra-
matically while the air-conditioning system
is switched on, switch off the air-condition-
ing system.
Coolant heat can additionally be dissipated
by opening the windows and by setting the
blower fan and the interior temperature to
maximum.
R When overtaking, pay particular attention
to the extended length of your vehicle/
trailer combination.
Due to the length of the vehicle/trailer
combination, you require additional road
space in relation to the vehicle you are
overtaking, before you can change back to
the original lane. Decoupling a trailer
G
WARNING
If you uncouple a trailer with the overrun
brake engaged, you could trap your hand
between the vehicle and the trailer drawbar.
There is a risk of injury.
Do not uncouple a trailer if the overrun brake is engaged.
! Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your
vehicle could be damaged by the rebound- ing of the overrun brake.
X Make sure that the automatic transmission
is set to position P.
X Apply the vehicle's parking brake.
X Close all doors and the tailgate.
X Apply the trailer's parking brake.
X Remove the trailer cable and decouple the
trailer. Permissible trailer loads and drawbar
loads
Weight specifications The gross trailer weight is calculated by add-
ing the weight of the trailer to the weight of
the load and equipment on the trailer.
You will find installing dimensions and loads
under "Technical data" (Y
page 381).
Loading a trailer R
When loading the trailer, make sure that
neither the permissible gross weight of the
trailer nor the gross vehicle weight is
exceeded. The permissible gross vehicle
weight is indicated on the identification
plate on the B-pillar on the driver's side of
the vehicle.
You can find the maximum permissible val-
ues on the type plates of your vehicle and
the trailer. When calculating how much
weight the vehicle and trailer may carry, 216
Towing a trailerDriving and parking

X
Press the 0064or0063 button to select the
Display unit Speed-/odometer
Display unit Speed-/odometer func-
tion.
You will see the selected setting: km
km or
Miles
Miles.
X Press the 0076button to save the setting.
The selected unit of measurement for dis-
tance applies to:
R Digital speedometer in the Trip
Trip menu
R Odometer and the trip odometer
R Trip computer
R Current consumption and the range
R Navigation instructions in the Navi Navimenu
R Cruise control
R DISTRONIC PLUS
R ASSYST PLUS service interval display
Selecting the permanent display function
You can determine whether the multifunction
display permanently shows your speed or the outside temperature.
X Press the 0059or0065 button on the steer-
ing wheel to select the Settings
Settings menu.
X Press the 0064or0063 button to select the
Instrument Cluster
Instrument Cluster submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Permanent Display: Permanent Display: function.
You will see the selected setting Outside
Outside
Temperature
Temperature orAdditional Speedome‐
Additional Speedome‐
ter [km/h]
ter [km/h] /AdditionalAdditional Speedometer
Speedometer
[mph]
[mph].
X Press the 0076button to save the setting.
i The speed is highlighted in km/h or in
mph conversely to your speedometer.
Lights Switching the daytime running lamps on/
off
Daytime running lamps are required by law
(Canada only). You cannot set the "daytime
running lamps" function via the on-board
computer. X
Press the 0059or0065 button on the steer-
ing wheel to select the Sett. Sett.menu.
X Press the 0064or0063 button to select the
Lights Lights submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Day Lights
Day Lights function.
If the Day Lights
Day Lights function has been
switched on, the cone of light and the 0086
symbol in the multifunction display are
shown in orange.
X Press the 0076button to save the setting.
Further information on daytime running
lamps (Y page 117).
Setting the brightness of the display/
switch X Press the 0059or0065 button on the steer-
ing wheel to select the Sett.
Sett. menu.
X Press the 0064or0063 button to select the
Lights Lights submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Brightness Display/Switches:
Brightness Display/Switches: func-
tion.
You will see the selected setting.
X Press 0076to confirm.
X Press the 0064or0063 button to adjust the
brightness to any level from Level 1 Level 1to
Level 5
Level 5 (bright).
X Press the 0076or0038 button to save the
setting.
Activating/deactivating surround light-
ing and exterior lighting delayed switch-
off
X Press the 0059or0065 button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the 0064or0063 button to select the
Lights
Lights submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Surround Lighting
Surround Lighting function.
When the Surround Lighting
Surround Lighting function is
activated, the light cone and the area Menus and submenus
231On-board computer and displays Z

around the vehicle are displayed in orange
in the multifunction display.
X Press the 0076button to save the setting.
Deactivating delayed switch-off of the exte-
rior lighting temporarily:
X Before leaving the vehicle, turn the Smart-
Key to position 0in the ignition lock.
X Turn the SmartKey to position 2in the igni-
tion lock.
The exterior lighting delayed switch-off is
deactivated.
Delayed switch-off of the exterior lighting is
reactivated the next time you start the
engine.
If you have activated the Surround Light‐
Surround Light‐
ing
ing function and the light switch is set to
0058, the following functions are activated
when it is dark:
R surround lighting: the exterior lighting
remains lit for 40 seconds after unlocking
with the SmartKey. If you start the engine,
the surround lighting is switched off and
automatic headlamp mode is activated
(Y page 117).
R exterior lighting delayed switch-off: the
exterior lighting remains lit for 60 seconds
after the engine is switched off. If you close all the doors and the tailgate, the exterior
lighting goes off after 5 seconds.
i Depending on your vehicle's equipment,
when the surround lighting and delayed
switch-off exterior lighting are on, the fol-
lowing light up:
R Parking lamps
R Front fog lamps
R Low-beam headlamps
R Daytime running lamps
R Side marker lamps
R Surround lighting in the exterior mirrors
Activating/deactivating the interior light-
ing delayed switch-off
If you activate the Interior Lighting
Interior Lighting
Delay
Delay function, the interior lighting remains on for 20 seconds after you remove the
SmartKey from the ignition lock.
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett Settmenu.
X Press the 0064or0063 button to select the
Lights
Lights submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Interior Lighting Delay
Interior Lighting Delay function.
If the Interior
Interior Lighting
Lighting Delay
Delayfunction
has been switched on, the vehicle interior is
displayed in orange in the multifunction
display.
X Press the 0076button to save the setting.
Vehicle Activating/deactivating the automatic
door locking mechanism
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett. Sett.menu.
X Press the 0064or0063 button to select the
Vehicle
Vehicle submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Auto. Door Locks
Auto. Door Locks function.
When the Auto. Door Locks
Auto. Door Locks function is
activated, the vehicle doors are displayed
in orange in the multifunction display.
X Press the 0076button to save the setting.
If you activate the Auto. Door Locks Auto. Door Locks func-
tion, the vehicle is centrally locked above a
speed of around 9 mph (15 km/h).
For further information on the automatic lock-
ing feature, see (Y page 85).
Activating/deactivating the acoustic
locking verification signal
If you switch on the Acoustic AcousticLock
Lockfunction,
an acoustic signal sounds when you lock the
vehicle.
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett. Sett.menu.
X Press the 0064or0063 button to select the
Vehicle Vehicle submenu. 232
Menus and submenusOn-board computer and displays

X
Press 0076to confirm.
X Press the 0064or0063 button to select the
Acoustic Lock
Acoustic Lock function.
If the Acoustic
Acoustic Lock
Lockfunction is activated,
the 0037 symbol in the multifunction dis-
play lights up orange.
X Press the 0076button to save the setting.
Activating/deactivating the radar sensor
system
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett.
Sett. menu.
X Press the 0064or0063 button to select the
Vehicle
Vehicle submenu.
X Press 0076to confirm.
X Press the 0063or0064 button to select
Radar Sensor (See Oper. Manual):
Radar Sensor (See Oper. Manual):.
You will see the selected setting: Enabled Enabled
or Disabled
Disabled.
X Press the 0076button to save the setting.
The following systems are switched off when
the radar sensor system is deactivated:
R DISTRONIC PLUS (Y page 176)
R BAS PLUS (Y page 69)
R PRE-SAFE ®
Brake (Y page 73)
R Blind Spot Assist (Y page 203)
R Active Blind Spot Assist (Y page 207)
Convenience Activating/deactivating the EASY-
ENTRY/EXIT feature
G
WARNING
When the EASY-ENTRY/EXIT feature adjusts
the steering wheel, you and other vehicle
occupants – particularly children – could
become trapped. There is a risk of injury.
While the EASY-ENTRY/EXIT feature is mak-
ing adjustments, make sure that no one has
any body parts in the sweep of the steering
wheel. If somebody becomes trapped:
R press one of the memory function position
buttons, or
R move the switch for steering wheel adjust-
ment in the opposite direction to that in
which the steering wheel is moving.
The adjustment process is stopped.
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett. Sett.menu.
X Press the 0064or0063 button to select the
Convenience
Convenience submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Easy Entry/Exit
Easy Entry/Exit function.
If the Easy Entry/Exit
Easy Entry/Exit function is activa-
ted, the vehicle steering wheel is displayed in orange in the multifunction display.
X Press the 0076button to save the setting.
Further information on the EASY-ENTRY/EXIT
feature (Y page 108).
Switching the belt adjustment on/off X Press the 0059or0065 button on the steer-
ing wheel to select the Sett.
Sett. menu.
X Press the 0064or0063 button to select the
Convenience
Convenience submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Belt Adjustment
Belt Adjustment function.
When the Belt Adjustment
Belt Adjustment function is
activated, the vehicle seat belt is displayed in orange in the multifunction display.
X Press the 0076button to save the setting.
For further information on belt adjustment,
see (Y page 59).
Switching the fold-in mirrors when lock-
ing feature on/off
This function is only available on vehicles with
the memory function (Y page 112).
This function is only available in Canada.
When you activate the Auto. Auto.Mirror
Mirror Fold‐
Fold‐
ing
ing function, the exterior mirrors are folded
in when the vehicle is locked. If you unlock the Menus and submenus
233On-board computer and displays Z

vehicle and then open a door, the exterior
mirrors fold out again.
X Press the 0059or0065 button on the steer-
ing wheel to select the Sett
Settmenu.
X Press the 0064or0063 button to select the
Convenience
Convenience submenu.
X Press 0076to confirm.
X Press the 0064or0063 button to select the
Auto. Mirror Folding
Auto. Mirror Folding function.
If the Auto. Mirror Folding
Auto. Mirror Folding function is
activated, the vehicle's exterior mirror is
displayed in orange in the multifunction
display.
X Press the 0076button to save the setting.
If you have switched the Auto. Mirror Auto. Mirror
Folding
Folding function on and you fold the exterior
mirrors in using the button on the door
(Y page 110), they will not fold out automat-
ically. The exterior mirrors can then only be
folded out using the button on the door.
Restoring the factory settings X
Press the 0059or0065 button on the steer-
ing wheel to select the Sett.
Sett. menu.
X Press the 0064or0063 button to select the
Factory Setting
Factory Setting submenu.
X Press 0076to confirm.
The Reset All Settings?
Reset All Settings? message
appears.
X Press the 0064or0063 button to select No
No
or Yes
Yes.
X Press the 0076button to confirm the selec-
tion.
If you have selected Yes Yes, the multifunction
display shows a confirmation message.
For safety reasons, the Day Lights
Day Lights function
in the Lights
Lights submenu is only reset if the
vehicle is stationary. 234
Menus and submenusOn-board computer and displays

Display messages
Possible causes/consequences and
0050
0050Solutions 0027(USA
only)004D
(Canada
only)
Check Brake Fluid Check Brake Fluid
Level Level There is not enough brake fluid in the brake fluid reservoir.
In addition, the
0027(USA only)/ 004D(Canada only) warning
lamp lights up in the instrument cluster and a warning tone
sounds.
G WARNING
The braking effect may be impaired.
There is a risk of an accident. X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 168).
X Consult a qualified specialist workshop.
X Do not add brake fluid. This does not correct the malfunction. 0026
Check Brake Pad Check Brake Pad
Wear Wear The brake pads/linings have reached their wear limit.
X Visit a qualified specialist workshop. 0053
Inoperative
Inoperative One or more main features of the mbrace system are malfunc-
tioning.
X Have the mbrace system checked immediately at a qualified
specialist workshop. PRE-SAFE PRE-SAFE
Inoperative See Inoperative See
Operator's Manual Operator's Manual
Important functions of PRE-SAFE
®
have failed. All other occupant
safety systems, e.g. air bags, remain available.
X Visit a qualified specialist workshop immediately. 238
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
0050
0050Solutions PRE-SAFE
PRE-SAFE
Functions Cur‐ Functions Cur‐
rently rently
Limited
Limited See
See
Operator's Manual
Operator's Manual PRE-SAFE
®
Brake is temporarily inoperative. Possible causes are:
R function is impaired due to heavy rain or snow.
R the sensors in the radiator trim and the bumper are dirty.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
When the causes stated above no longer apply, the display mes-
sage disappears.
PRE ‑SAFE ®
Brake is operational again.
If the display message does not disappear:
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 168).
X Clean the sensors in the radiator grill and the bumper
(Y page 309).
X Restart the engine. PRE-SAFE PRE-SAFE
Functions Limited Functions Limited
See See
Operator's
Operator's Man‐
Man‐
ual
ual PRE-SAFE
®
Brake is inoperative due to a malfunction. BAS PLUS or
the distance warning signal may also have failed.
X Visit a qualified specialist workshop. 0075
SRS Malfunction SRS Malfunction
Service required Service required There is a malfunction in the SRS (Supplemental Restraint Sys-
tem). The
0075warning lamp also lights up in the instrument clus-
ter.
G WARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop.
For further information about SRS, see (Y page 43). Display
messages
239On-board computer and displays Z

Display messages
Possible causes/consequences and
0050
0050Solutions 0075
Front Front
Left
LeftMalfunc‐
Malfunc‐
tion Service
tion Service
Required Required orFront
Front
Right Malfunction
Right Malfunction
Service Required Service Required SRS has malfunctioned at the front on the left or right. The
0075
warning lamp also lights up in the instrument cluster.
G WARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop. 0075
Rear left malfunc‐ Rear left malfunc‐
tion Consult work‐ tion Consult work‐
shop shop
orRear right
Rear right
malfunction Con‐
malfunction Con‐
sult workshop sult workshop G
WARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
SRS has malfunctioned at the rear on the left or right. The 0075
warning lamp also lights up in the instrument cluster.
X Visit a qualified specialist workshop. 0075
Rear Center Mal‐ Rear Center Mal‐
function Service function Service
Required Required G
WARNING
The air bags or Emergency Tensioning Devices may either be trig- gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
SRS has malfunctioned at the rear center. The 0075warning lamp
also lights up in the instrument cluster.
X Visit a qualified specialist workshop. 0075
Left Side Curtain Left Side Curtain
Airbag Airbag
Malfunction
Malfunction
Service Required
Service Required
or Right Side Cur‐ Right Side Cur‐
tain Airbag Mal‐
tain Airbag Mal‐
function Service function Service
Required Required There is a malfunction in the left-hand or right-hand window cur-
tain air bag.
The
0075 warning lamp also lights up in the instrument cluster.
G WARNING
The left or right window curtain air bag may either be triggered
unintentionally or, in the event of an accident, may not be trig-
gered.
There is an increased risk of injury. X Visit a qualified specialist workshop. 240
Display
messagesOn-board computer and displays