
For further information about Adaptive
Highbeam Assist, see (
Y page 127).
Activating/deactivating surround
lighting and exterior lighting delayed
switch-off
X Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press the  :  or 9 button to select the
Lights submenu.
X Press a to confirm.
X Press : or 9 to select the
Surround Lighting function.
When the  Surround Lighting  function is
activated, the light cone and the area
around the vehicle are displayed in red in
the multifunction display.
X Press the a button to save the setting.
Deactivating delayed switch-off of the
exterior lighting temporarily:
X Before leaving the vehicle, turn the
SmartKey 
to position  0 in the ignition lock.
X Turn the SmartKey to position  2 in the
ignition 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 
Lighting 
function and the light switch is set
to  Ã, 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
the automatic headlamp mode is activated
(Y page 121).
R Exterior lighting delayed switch-off:  the
exterior lighting remains lit for 60seconds
after the engine is switched off. If you close
all the doors and the trunk lid, 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
following 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
lighting delayed switch-off
If you activate the Interior Lighting 
Delay function, the interior lighting remains
on for 20seconds after you remove the
SmartKey from the ignition lock.
X Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press the  : 
 or 9 button to select the
Lights submenu.
X Press a to confirm.
X Press : or 9 to select the  Light. 
Delay function.
When the Interior Lighting Delay
function 
is activated, the vehicle interior is
displayed in red in the multifunction
display.
X Press the a button to save the setting.
Vehicle Activating/deactivating the automatic
door locking mechanism
X
Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press : or 9 to select the  Vehicle
submenu.
X Press a to confirm. Menus and submenus
225
On-board computer and displays Z 

X
Press : or 9 to select the  Auto. 
Door Locks function.
When 
the Automatic Door Lock  function
is activated, the vehicle doors are displayed
in red in the multifunction display.
X Press the a button to save the setting.
If you activate the Automatic Door Lock
function, 
 the vehicle is centrally locked above
a speed of around 9 mph (15 km/h).
For further information on the automatic
locking feature, see ( Y page 80).
Activating/deactivating the acoustic
locking verification signal
If you switch on the  Acoustic Lock function,
an acoustic signal sounds when you lock the
vehicle.
X Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press : or 9 to select the  Vehicle
submenu.
X Press a to confirm.
X Press the  : 
 or 9 button to select the
Acoustic Lock function.
If the  Acoustic Lock function is activated,
the & symbol in the multifunction
display lights up red.
X Press the a button to save the setting.
Activating/deactivating the radar sensor
system
X Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press : or 9 to select the  Vehicle
submenu.
X Press a to confirm.
X Press the 9 or : button to select
Radar Sensor (See Oper. Manual):.
You will see the selected setting:  On or
Off.
X Press the a button to save the setting. The following systems are switched off when
the radar sensor system is deactivated:
R
DISTRONIC PLUS (Y page 177)
R BAS PLUS 
(Y page 65)
R PRE-SAFE ®
 Brake (Y page 67)
R Blind Spot Assist (Y page 200)
R Active Blind Spot Assist (Y page 204)
Convenience Activating/deactivating the EASY-
ENTRY/EXIT feature
G
WARNING
You must make sure no one can become
trapped or injured by the moving steering
wheel when the easy-entry/exit feature is
activated.
To stop steering wheel movement, move
steering 
wheel adjustment lever or press one
of the memory position buttons.
Do not leave children unattended in the
vehicle, or with access to an unlocked vehicle.
Children could open the driver's door and
unintentionally activate the easy-entry/exit
feature, which could result in an accident
and/or serious personal injury.
X Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press the  : 
 or 9 button to select the
Convenience submenu.
X Press a to confirm.
X Press : or 9 to select the  Easy 
Entry/Exit: function.
If the  Easy Entry/Exit function is
activated, the vehicle steering wheel is
displayed in red in the multifunction
display.
X Press the a button to save the setting.
Further information on the EASY-ENTRY/EXIT
feature ( Y page 114).226
Menus and submenus
On-board computer and displays 

Switching the belt adjustment on/off
X
Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press the  :  or 9 button to select the
Convenience submenu.
X Press a to confirm.
X Press the  : 
 or 9 button to select the
Belt Adjustment function.
When the Belt Adjustment function is
activated, the vehicle seat belt is displayed
in red in the multifunction display.
X Press the a button to save the setting.
For further information on belt adjustment,
see ( Y page 56).
Switching the fold-in mirrors when
locking feature on/off
This 
function is only available on vehicles with
the memory function ( Y page 117).
When you activate the  Auto. Mirror 
Folding function, the exterior mirrors are
folded in when the vehicle is locked. If you
unlock the vehicle and then open a door, the
exterior mirrors fold out again.
X Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press the  : 
 or 9 button to select the
Convenience submenu.
X Press a to confirm.
X Press : or 9 to select the  Auto. 
Mirror Folding function.
If the  Auto. Mirror Folding function is
activated, the vehicle's exterior mirror is
displayed in red in the multifunction
display.
X Press the a button to save the setting. :
To fold the exterior mirrors in or out
If you have switched on the  Auto. Mirror 
Folding 
 function and you fold in the exterior
mirrors by pressing button :, the exterior
mirrors will not fold out automatically
(Y page 115).
You can then only fold out the exterior mirrors
using button :.
Restoring the factory settings X
Press the = or ; button on the
steering wheel to select the Sett. menu.
X Press the  : 
 or 9 button to select the
Factory Setting submenu.
X Press a to confirm.
The Reset All Settings? message
appears.
X Press the : or 9 button to select
No or Yes.
X Press a to confirm the selection.
If 
you have selected  Yes, the multifunction
display shows a confirmation message.
For safety reasons, the Daytime Running 
Lights function in the  Lights submenu is
only reset if the vehicle is stationary. Menus and submenus
227
On-board computer and displays Z   

Safety systems
Display messages Possible causes/consequences and 
M Solutions!÷
Currently 
Unavailable See 
Operator's Manual ABS (Anti-lock Braking System), ESP
®
 (Electronic Stability
Program),  BAS (Brake Assist), PRE-SAFE ®
, the HOLD function and
hill start assist are temporarily unavailable.
BAS PLUS and PRE-SAFE ®
 Brake may also have failed.
In addition, the ä, å and ! warning lamps light up in
the instrument cluster.
ATTENTION ASSIST is deactivated.
For example, the on-board voltage may be insufficient.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely
affected. The braking distance in an emergency braking situation
can increase.
If ESP ®
 
is not operational, ESP ®
 is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Drive on carefully.
If the display message disappears, the functions mentioned
above are available again.
If the display message continues to be displayed:
X Drive on carefully.
X Visit a qualified specialist workshop. !÷
Inoperative See 
Operator's Manual ABS, ESP
®
, BAS, PRE-SAFE ®
, the HOLD function and hill start
assist are unavailable due to a malfunction.
BAS PLUS and PRE-SAFE ®
 Brake may also have failed.
The $ (USA only)/J (Canada only),  ä, å and !
warning lamps in the instrument cluster also light up.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely
affected. The braking distance in an emergency braking situation
can increase.
If ESP ®
 
is not operational, ESP ®
 is unable to stabilize the vehicle. Display messages
229
On-board computer and displays Z 

Display messages Possible causes/consequences and 
M SolutionsThere is an increased risk of skidding and an accident.
X
Drive on carefully.
X Visit a qualified specialist workshop immediately. ÷
Inoperative See 
Operator's Manual ESP
®
, BAS, PRE-SAFE ®
, the HOLD function and hill start assist are
unavailable due to a malfunction.
BAS PLUS and PRE-SAFE ®
 Brake may also have failed.
In addition, the ä and å warning lamps light up in the
instrument cluster.
The self-diagnosis function might not be complete, for example.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above.
The braking distance in an emergency braking situation can thus
increase.
If ESP ®
 
is not operational, ESP ®
 is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Drive on carefully.
X Visit a qualified specialist workshop. T!
÷
Inoperative See 
Operator's Manual EBD (electronic brake force distribution), ABS, ESP
®
, BAS, PRE-
SAFE ®
, 
the HOLD function and hill start assist are unavailable due
to a malfunction.
BAS PLUS and PRE-SAFE ®
 Brake may also have failed.
In addition, the ä, å and ! warning lamps light up in
the instrument cluster and a warning tone sounds.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely
affected. The braking distance in an emergency braking situation
can increase.
If ESP ®
 
is not operational, ESP ®
 is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
X Drive on carefully.
X Visit a qualified specialist workshop immediately.230
Display messages
On-board computer and displays 

Display messages Possible causes/consequences and 
M SolutionsF(USA
only)J(Canada
only)
Please Release 
Parking Brake You are driving with the parking brake applied. A warning tone also
sounds.
X
Release the parking brake. $(USA
only)J(Canada
only)
Brake Immediately A malfunction has occurred while the HOLD function or
DISTRONIC PLUS is active.
A 
tone may also sound at regular intervals. If you attempt to lock
the vehicle, the tone becomes louder.
You cannot start the engine.
X Paying attention to the traffic situation, immediately depress the
brake pedal firmly and hold until the display message
disappears.
X Secure the vehicle against rolling away ( Y page 167).
You can restart the engine. $(USA
only)J(Canada
only)
Check Brake Fluid 
Level There is not enough brake fluid in the brake fluid reservoir.
In addition, the $ (USA only)/J (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 167).
X Consult a qualified specialist workshop.
X Do not add brake fluid. This does not correct the malfunction. #
Check Brake Pad 
Wear The brake pads/linings have reached their wear limit.
X
Visit a qualified specialist workshop. G
mbrace Inoperative One or more main features of the mbrace system are
malfunctioning.
X
Have the mbrace system checked immediately at a qualified
specialist workshop. Display messages
231
On-board computer and displays Z 

Display messages Possible causes/consequences and 
M Solutions6
SRS Malfunction 
Service Required There is a malfunction in the SRS (Supplemental Restraint
System). The 6 warning lamp also lights up in the instrument
cluster.
G WARNING
The air bags or Emergency Tensioning Devices may either be
triggered 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 39). 6
Front Left 
Malfunction 
Service Required 
or Front Right 
Malfunction 
Service Required SRS has malfunctioned at the front on the left or right. The 
6
warning lamp also lights up in the instrument cluster.
G WARNING
The air bags or Emergency Tensioning Devices may either be
triggered 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. 6
Rear Left 
Malfunction 
Service Required 
or Rear Right 
Malfunction 
Service Required G
WARNING
The air bags or Emergency Tensioning Devices may either be
triggered 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  6
warning lamp also lights up in the instrument cluster.
X Visit a qualified specialist workshop. 6
Left Side Curtain 
Airbag 
Malfunction 
Service Required 
or Right Side 
Curtain Airbag 
Malfunction 
Service Required There is a malfunction in the left-hand or right-hand window
curtain air bag (Coupe) or head bag (Cabriolet).
The 6 warning lamp also lights up in the instrument cluster.
G WARNING
The left or right window curtain air bag (Coupe) or headbag
(Cabriolet) 
 may either be triggered 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. Display messages
233
On-board computer and displays Z 

Display messages Possible causes/consequences and 
M SolutionsFront Passenger 
Airbag Enabled
See Operator's 
Manual The front-passenger air bag is enabled during the journey, even
though:
R
a child, a small adult or an object weighing less than the
system's weight threshold is located on the front-passenger
seat.
or
R the front-passenger seat is unoccupied.
The system may detect objects or forces applying additional
weight on the seat.
G WARNING
The air bag may deploy unintentionally.
There is an increased risk of injury.
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 167).
X Switch the ignition off.
X Open the front-passenger door.
X Remove the child and the child restraint system from the front-
passenger seat.
X Make sure that there are no objects on the seat adding to the
weight.
The system may otherwise detect the additional weight and
interpret the seat occupant's weight as greater than it actually
is.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
X Observe the  ^a  indicator lamp in the center console and
the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the  45 
indicator lamp must light up and remain lit. When
the indicator lamp is on, OCS (Occupant Classification System)
has deactivated the front-passenger air bag ( Y page 46).
R the Front Passenger Airbag Enabled See Operator's 
Manual or Front Passenger Airbag Disabled See 
Operator's Manual display messages must not be shown in
the multifunction display.
X Wait for a period of at least 60 seconds until the necessary
system checks have been completed.
X Make sure that the display messages do not appear in the
multifunction display.234
Display messages
On-board computer and displays