Important safety notes
G
WARNING
If you operate information systems and com-
munication equipment integrated in the vehi- cle when driving, you may be distracted from
the traffic situation. You could also lose con-
trol of the vehicle. There is a risk of an acci-
dent.
Only operate this equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
You must observe the legal requirements for the country in which you are currently driving whenoperating the on-board computer. G
WARNING
If the instrument cluster has failed or mal-
functioned, you may not recognize function
restrictions in systems relevant to safety. The operating safety of your vehicle may be
impaired. There is a risk of an accident.
Pull over as soon as it is safe to do so and
consult a qualified specialist workshop.
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 panel illus-
tration (Y page 37).
Plug-in hybrid: be sure to read the separate
Operator's Manual. Otherwise, you may not rec-
ognize dangers. 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 37). X
Turn the brightness control knob clockwise or
counter-clockwise.
If you turn the light switch to 0058,0060or
0058, 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 segments in the speedometer indicate
which speed range is available.
R Cruise control activated (Y page 169):
The segments light up from the stored speed to the maximum speed.
R Active Distance Assist DISTRONIC activated
(Y page 171):
One or two segments in the set speed range
light up.
R Active Distance Assist DISTRONIC 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. Tachometer
! Do not drive in the overrevving range, as this
could damage the engine.
The red band in the tachometer indicates the
engine's overrevving range.
The fuel supply is interrupted to protect the
engine when the red band is reached. Outside temperature display
You should pay special attention to road condi-
tions when temperatures are around freezing
point.
Bear in mind that the outside temperature dis-
play indicates the temperature measured and
does not record the road temperature.
The outside temperature display is in the multi-
function display (Y page 231). Displays and operation
229On-board computer and displays Z
R
calling up display messages in message mem-
ory (Y page 244)
R restarting the tire pressure loss warning sys-
tem (Y page 358) or checking the tire pres-
sure electronically (Y page 360)
R calling up the service due date (Y page 325).Settings menu
Introduction Depending on the equipment installed in the
vehicle, In the Sett. Sett.menu you have the follow-
ing options:
R Changing the instrument cluster settings
(Y page 239)
R Changing the light settings (Y page 239)
R Changing the vehicle settings (Y page 240)
R Changing the convenience settings
(Y page 240)
R Restoring the factory settings (Y page 241)
Instrument cluster submenu Selecting the distance unit
The Display Unit Speedometer / Odome‐
Display Unit Speedometer / Odome‐
ter:
ter: function allows you to choose whether
certain displays appear in kilometers or miles in the multifunction display.
X Press the 0059or0065 button on the steering
wheel to select the Sett.
Sett. 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
Display Unit Speedometer / Odometer
Display Unit Speedometer / Odometer
function.
You will see the selected setting: km
km ormiles miles.
X Press the 0076button to save the setting.
The selected unit of measurement for distance
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
Navi menu
R Cruise control R
Active Distance Assist DISTRONIC
R ASSYST PLUS service interval display
Selecting permanent display 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 the speedome-
ter.
X Press the 0059or0065 button on the steering
wheel to select the Sett. Sett.menu.
X Press the 0064or0063 button to select the
Instrument Cluster
Instrument Cluster submenu.
X Confirm by pressing 0076on the steering
wheel.
X Press the 0064or0063 button to select the
Permanent Display:
Permanent Display: function.
The current setting, Outside Temperature
Outside Temperature,
Speedometer [km/h]
Speedometer [km/h] orSpeedometer
Speedometer
[mph]
[mph] appears.
X To change the setting: press0076again.
Light submenu Setting the daytime running lamps
This function is not available in Canada.
X Press the 0059or0065 button on the steering
wheel to select the Sett.
Sett.menu.
X Press the 0064or0063 button to select the
Light
Light submenu.
X Press 0076to confirm.
X Press 0064or0063 to select the Daytime
Daytime
Running Lights
Running Lights function.
If the Daytime
Daytime Running
RunningLights
Lightsfunction 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 110).
Switching the Intelligent Light System
on/off
X Press the 0059or0065 button on the steering
wheel to select the Sett. Sett.menu.
X Press the 0064or0063 button to select the
Light
Light submenu.
X Press 0076to confirm. Menus and submenus
239On-board computer and displays Z
Safety systems
Display messages
Possible causes/consequences and
0050
0050Solutions 002500E5
Currently Unavaila‐
Currently Unavaila‐
ble See Operator's ble See Operator's
Manual Manual ABS (Anti-lock Braking System) and ESP
®
(Electronic Stability Pro-
gram) are temporarily not available.
Other driving systems and driving safety systems may also malfunc-
tion.
In addition, the 00E5,00BBand0025 warning lamps light up in the
instrument cluster.
Possible causes are:
R Self-diagnosis is not yet complete
R 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 Carefully drive a suitable distance, making slight steering move-
ments at a speed above 12 mph (20 km/h).
If the display message disappears, the functions mentioned above
are available again.
If the multifunction display still shows the display message:
X Drive on carefully.
X Visit a qualified specialist workshop immediately. 002500E5
Inoperative See Inoperative See
Operator's Manual Operator's Manual ABS and ESP
®
are malfunctioning.
Other driving systems and driving safety systems may also malfunc-
tion.
The 0027 (USA only) or 004D(Canada only), 00E5,00BBand0025
warning lamps in the instrument cluster also light up.
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.
X Visit a qualified specialist workshop immediately. Display messages
245On-board computer and displays Z
Display messages
Possible causes/consequences and
0050
0050Solutions 007A
0025
00E5 Inoperative See
Inoperative See
Operator's Manual Operator's Manual EBD (electronic brake force distribution), ABS and ESP
®
are malfunc-
tioning.
Other driving systems and driving safety systems may also malfunc-
tion.
In addition, the 00E5,00BBand0025 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 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. 0049
(USA
only) 0024 (Canada
only)
Turn On the Igni‐ Turn On the Igni‐
tion tion to
toRelease
Release the
the
Parking Brake
Parking Brake The red
0049(USA only) or 0024(Canada only) indicator lamp lights
up.
You attempted to release the electric parking brake while the ignition
was switched off.
X SmartKey : insert the SmartKey into the ignition lock and turn to
position 0047.
X KEYLESS-GO: switch on the ignition. 0049
(USA
only) 0024 (Canada
only)
Please Please Release Release Park‐
Park‐
ing Brake
ing Brake The red
0049(USA only) or 0024(Canada only) indicator lamp flashes
and a warning tone sounds. A condition for automatic release of the
electric parking brake is not fulfilled (Y page 157).
You are driving with the electric parking brake applied.
X Release the electric parking brake manually. The red
0049(USA only) or 0024(Canada only) indicator lamp flashes
and a warning tone sounds.
You are using the electric parking brake for emergency braking
(Y page 157). 0049
(USA
only) 0024 (Canada
only)
Parking Brake See Parking Brake See
Operator's Manual Operator's Manual The yellow
0024warning lamp lights up.
The electric parking brake is malfunctioning.
To apply:
X Switch the ignition off.
X Press the electric parking brake handle for at least ten seconds.
X Shift the transmission to position 005D.
X Consult a qualified specialist workshop. Display
messages
247On-board computer and displays Z
Display messages
Possible causes/consequences and
0050
0050Solutions The yellow
0024warning lamp lights up and the red 0049(USA only)
or 0024 (Canada only) indicator lamp flashes.
It is not possible to apply the electric parking brake manually.
X Shift the transmission to position 005D.
X Visit a qualified specialist workshop. 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) or 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 156).
X Consult a qualified specialist workshop.
X Do not add brake fluid. This does not correct the malfunction. 0026
Check Check
Brake
Brake Pad
PadWear
Wear The brake pads/linings have reached their wear limit.
USA only: the red
0027brake system warning lamp is lit while the
engine is running.
X Visit a qualified specialist workshop. 0053
Inoperative Inoperative One or more main features of the mbrace system are malfunctioning.
X Visit a qualified specialist workshop. Active
Active
Brake
Brake Assist
Assist
Functions
Functions Currently
Currently
Limited See Opera‐
Limited See Opera‐
tor's Manual tor's Manual Active Brake Assist with cross-traffic function is temporarily inopera-
tive.
Possible causes are:
R the radar sensor system is temporarily inoperative, e.g. due to elec-
tromagnetic radiation emitted by nearby TV or radio stations 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 message
disappears.
Active Brake Assist with cross-traffic function or PRE ‑SAFE®
PLUS is
functional 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 156).
X Restart the engine. 250
Display
messagesOn-board computer and displays
Display messages
Possible causes/consequences and
0050
0050Solutions Radar
Radar
Sensors
Sensors Dirty
Dirty
See Operator's Man‐
See Operator's Man‐
ual ual The radar sensor system is malfunctioning.
Possible causes are:
R dirt on sensors
R heavy rain or snow
R when driving on inter-urban roads without traffic or infrastructure,
e.g. in desert-like areas
At least one driving system or driving safety system is malfunctioning
or is temporarily unavailable:
R PRE-SAFE ®
PLUS
R Active Brake Assist
R Active Lane Keeping Assist
R Active Blind Spot Assist
R Active Distance Assist DISTRONIC
If the radar sensor system in front is dirty, Active Blind Spot Assist will
not perform a course-correcting brake application.
A warning tone also sounds.
Once the cause of the problem is no longer present, the driving and
drive safety systems will be available again. The display message dis-
appears.
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 156).
X Switch off the engine.
X Clean all sensors (Y page 330).
X Restart the engine.
The display message disappears. 0075
SRS SRS
Malfunction Malfunction Ser‐
Ser‐
vice Required
vice Required The restraint system is malfunctioning.
The
0075 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 immediately.
For further information about the restraint system, see (Y page 44).0075
Front Left Malfunc‐ Front Left Malfunc‐
tion Service tion Service
Required Required
orFront
Front
Left Malfunction
Left Malfunction
Service Required Service Required The restraint system 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 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 immediately. 252
Display
messagesOn-board computer and displays
Display messages
Possible causes/consequences and
0050
0050Solutions 0075
Rear Left Malfunc‐ Rear Left Malfunc‐
tion Service tion Service
Required Required
orRear
Rear
Right Malfunction
Right Malfunction
Service Required Service Required The rear left-hand or right-hand restraint system is malfunctioning.
The 0075 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 immediately. 0075
Rear Rear
Center
Center Malfunc‐
Malfunc‐
tion Service
tion Service
Required Required The rear center restraint system is malfunctioning. The
0075warning
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 immediately. 0075
Left Side Curtain Left Side Curtain
Airbag Malfunction Airbag Malfunction
Service Required Service Required
or
Right Side Curtain
Right Side Curtain
Airbag Malfunction Airbag Malfunction
Service Required Service Required The left-hand or right-hand window curtain air bag is malfunctioning.
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 unin-
tentionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
X Visit a qualified specialist workshop immediately. Display
messages
253On-board computer and displays Z
Display messages
Possible causes/consequences and
0050
0050Solutions Because there is interference from a strong source of radio waves, the
SmartKey is not detected whilst the engine is running.
A warning tone also sounds.
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 156).
X Insert the SmartKey into the ignition lock and drive in SmartKey
mode. 00AF
Remove 'Start' But‐ Remove 'Start' But‐
ton and Insert Key ton and Insert Key R
The SmartKey detection function has a temporary malfunction or is
faulty.
R The SmartKey is continually undetected.
A warning tone also sounds.
X Insert the SmartKey into the ignition lock and turn it to the desired
position.
X Visit a qualified specialist workshop. Warning and indicator lamps in the instrument cluster
General notes
Some systems carry out a self-diagnosis when the ignition is switched on. Therefore, some indicator and warning lamps may light up or flash temporarily. This behavior is non-critical. These indicator
and warning lamps only indicate a malfunction if they light up or flash after starting the engine or
whilst driving. Safety
Seat belts Warning/
indicator
lamp
0051 0051
Signal type
Possible causes/consequences and 0050 0050Solutions 00E9
0051
After starting the engine, the red seat belt warning lamp lights up for 6 seconds.
The seat belt warning lamp reminds the driver and front passenger to fasten their
seat belts.
X Fasten your seat belt (Y page 48).00E9
0051
After starting the engine, the red seat belt warning lamp lights up. In addition, a
warning tone sounds for up to 6 seconds.
The driver's seat belt is not fastened.
X Fasten your seat belt (Y page 48).
The warning tone ceases. 274
Wa
rning and indi cator lamps in the instrument clusterOn-board computer and displays