2013 MERCEDES-BENZ R-CLASS FAMILY TOURER sensor

tone sounds. Red warning lamp
:flashes. If
the tur nsignal remains on, detected vehicles
are indicated by the flashing of red warning
lamp :.There are no further warning tones.
Switching on Blind Spot Assist X
Make sure that the radar sensor system
(Y page 209) and Blind Spot Assist
(Y page 211) are activated in the on-board
computer.
X Turn the SmartKey to position 2in the
ignition lock.
Warning lamps :in the exterior mirrors
light up red for approximately
1.5 seconds and then turn yellow.
Towing atrailer When you attach a trailer, make sure you have
correctly established the electrical
connection. This ca
nbe accomplished by
checking the trailer lighting. In this event,
Blind Spot Assist is deactivated. The indicator
lamp in the exterior mirrors lights up yellow,
and the Blind Spot Assist Currently Unavailable See Operator's Manual
message appears in the multifunction
display.
i
You can deactivate the indicator lamps in
the exterior mirrors.
To do so, switch off Blind Spot Assist when:
R the SmartKey is in position 2in the
ignition lock.
R the engine is not running.
R the electrical connection to the trailer
has been established. Towing
atrailer Notes on towing
atrailer
Important safety notes G
WARNING
If you install a ball coupling other tha nthe one
delivered with the vehicle, the trailer tow hitch
and the rear axle may be overloaded. This
applies especially if the ball coupling in
question is longer or angled differently. This
could seriously impair the driving
characteristics and the trailer can come
loose. There is a risk of an accident.
Only install the ball coupling delivered with
the vehicle or a ball coupling that is designed
to meet your trailer towing requirements. Do
not modify the ball coupling or the trailer tow
hitch. G
WARNING
If the ball coupling is not installed correctly or
not secured with the bolt provided and the
corresponding spring cotter, the trailer may
come loose. There is a risk of an accident.
Always install and secure the ball coupling as
described. Before every journey, ensure that
the ball coupling is secured with the bolt and
the corresponding spring cotter. G
WARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. This
increases the stopping distance and can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as a footrest.N ever
depress the brake pedal and the accelerator
pedal at the same time. G
WARNING
When the vehicle/trailer combination begins
to lurch, you could lose control of it. The
vehicle/trailer combination could even
rollover. There is a risk of an accident. Towing
atrailer
193Driving an d parking
Z

i
The light sensor in the instrument cluster
automatically controls the brightness of
the multifunction display.
Displays and switches in the vehicle
interior: if the light switch is set to Ã,
brightness control takes ambient light into
account. If the light switch is set to Tor
L, brightness control does not take
ambient light into account. 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 protec tthe
engine when the red band is reached. Outside temperature display
G
WARNING
The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Indicated temperatures just above the
freezing point do not guarantee that the road
surface is free of ice. The road may still be icy,
especially in wooded areas or on bridges.
The outside temperature display is in the
multifunction display (Y page 203).
Changes in the outside temperature are
displayed after a short delay. Speedometer with segments
The segments in the speedometer indicate
which speed range is available.
R DISTRONIC activated (Y page 175):
One or two segments in the set speed
range light up.
R DISTRONIC detects a vehicle in front: The segments between the speed of the
vehicle in front and the stored speed light
up. Operating the on-board computer
Overview :
Multifunction display
; Right control panel
= Left control panel
X To activate the on-board computer: turn
the SmartKey to position 1in the ignition
lock.
You can control the multifunction display and
the settings in the on-board computer using
the buttons on the multifunction steering
wheel.
Left control panel ~ R
Rejects or ends a call
R Exits phone book/redial
memory 6 R
Makes or accepts a call
R Switches to the redial memory Displays and operation
201On-board computer and displays Z

If you have activated the delayed switch-off
function, the lights
witchis set to cor
à and you switch off the engine, the
following remain lit:
R Parking lamps
R License plate lamp
R Tail lamp
R Fog lamps 15
R Low-beam headlamps 16
R Side marker lamps
Activating/deactivating the interior
lighting delayed switch-off
If the Interior Lighting Delayed Shut- off function is activated and you remove the
SmartKey from the ignition lock, the interior
lighting remains on for approximately
10 seconds.
X Press the VorU button on the
steering wheel to select the Settingsmenu.
X Press the &button to call up the
selection of submenus.
X Press the WorX button to select the
Lighting submenu.
X Press the &button to select Interior Lighting Delayed Shut-off .
X Press the WorX button to activate
or deactivate Interior Lighting Delayed Shut-off .
X Press the &,VorU button to
select a different display.
Vehicle Activating/deactivating the automatic
door locking mechanism
X
Press the VorU button on the
steering wheel to select the Settingsmenu.
X Press WorX to select the Vehicle submenu. X
Press the &button to select
Automatic Door Locking .
X Press the WorX button to activate
or deactivate the Automatic Door Locking feature.
X Press the &,VorU button to
select a different display.
For further information on the automatic
locking feature, see (Y page 83).
Activating/deactivating the acoustic
locking verification signal
If you switch on the Acoustic Lock Feedback: function, an acoustic signal
sounds when you lock the vehicle.
X Press the VorU button on the
steering wheel to select the Settings menu.
X Press the &button to call up the
selection of submenus.
X Press WorX to select the Vehicle submenu.
X Press the &button to select Acoustic Lock Feedback .
X Press the WorX button to switch
the Acoustic Lock Feedback function
on/off.
X Press the &,VorU button to
select a different display.
Activating/deactivating the radar sensor
system
X Press the VorU button on the
steering wheel to select the Settings menu.
X Press the &button to call up the
selection of submenus.
X Press WorX to select the Vehicle submenu.
X Press the &button to select Radar Sensor (See Operator's Manual) .
15 Only for vehicles with front fog lamps.
16 Only for vehicles without front fog lamps. Menus and submenus
209On-board computer and displays Z

X
Press the WorX button to activate
or deactivate the Radar Sensor (See Operator's Manual) .
X Press the &,VorU button to
select a differen tdisplay.
If the radar sensor system is switched off,
Blind Spot Assist (Y page 191)is deactivated.
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 do one of
the following:
R Move steering wheel adjustment stalk.
R Press one of the memory position buttons.
R Press memory button M.
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 VorU button on the
steering wheel to select the Settingsmenu.
X Press the &button to call up the
selection of submenus.
X Press the WorX button to select the
Comfort submenu.
X Press &to select the Easy-entry Function .
X Press the abutton to save the setting.
X Press the WorX button to activate
or deactivate the Easy-entry Function .
X Press the &,VorU button to
select a different display. Further information on the EASY-ENTRY/EXIT
feature (Y
page 113).
Switching the belt adjustment on/off
X Press the VorU button on the
steering wheel to select the Settings menu.
X Press the &button to call up the
selection of submenus.
X Press the WorX button to select the
Comfort submenu.
X Press the &button to select Belt Adjustment .
X Press the WorX button to activate
or deactivate Belt Adjustment .
X Press the &,VorU button to
select a different display.
For further information on belt adjustment,
see (Y page 57).
Switching the fold-in mirrors when
locking feature on/off
This function is only available on vehicles with
the memory function (Y page 116).
When you activate the Fold Mirrors In When Locking function, the exterior mirrors
are folded in when the vehicle is locked. If you
switch on the ignition, the exterior mirrors
fold out again.
If you have switched the function on and you
fold the exterior mirrors in using the button
on the door (Y page 115), they will not fold
out automatically. The exterior mirrors can
then only be folded out using the button on
the door.
X Press the VorU button on the
steering wheel to select the Settings menu.
X Press the &button to call up the
selection of submenus.
X Press the WorX button to select the
Convenience submenu.
X Press the &button to select Fold In Mirrors When Locking .210
Menus and submenusOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
b
Daytime Running
Light
Left orDaytime
Running Light Right The left-hand or right-hand daytime running lamp is faulty.
X
Chec kwhether you are permitted to replace the bulb yourself
(Y page 126).
or
X Visit a qualified specialist workshop. b
AUTO Light
Inoperative The light sensor is defective.
X
Visit a qualified specialist workshop.
USA only:
X Switch off the daytime running lamps in the on-board computer
(Y page 207).
X Switch the lights on and off using the light switch. b
Switch Off Lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to $orÃ.
or
X If the rear fog lamp is switched on: press the light switch in to
the stop. Engine
Display messages Possible causes/consequences and
M Solutions
+
Top
Up Coolant See
Operator's Manual The coolant level is too low.
!
Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Add coolant, observing the warning notes before doing so
(Y page 287).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at a qualified specialist
workshop. ? The fan motor is faulty.
X
At coolant temperatures under 248 ‡(120 †), drive to the next
qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-and-go traffic. 224
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
Blind Spot Assist
Currently
Unavailable See
Operator's Manual Blind Spot Assis
tis temporarily inoperative.
you have established the electrical connection between the trailer
and your vehicle.
X Press ato confirm the display message.
Blind Spot Assist is deactivated while towing a trailer. Blind Spot Assist is temporarily inoperative. Possible causes are:
R
the sensors are dirty.
R function is impaired due to heavy rain or snow.
R the radar sensor system is outside the operating temperature
range.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
The yellow 9indicator lamps also light up in the exterior
mirrors.
When the causes stated above no longer apply, the display
message disappears.
Blind Spot Assist is operational again.
If you are driving without a trailer and the displaym essage does
not disappear:
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 166).
X Clean the sensors (Y page 293).
X Restart the engine. Blind Spot Assist
Inoperative Blind Spot Assist is defective.
The yellow
9indicator lamps also light up in the exterior
mirrors.
X Visit a qualified specialist workshop. Cruise Control
Inoperative Cruise control is defective.
Aw
arning tone also sounds.
X Visi taqualified specialist workshop. Display messages
229On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
Cruise Control
- - - MPH Ac
ondition for activating cruise control has not been fulfilled.
You have tried to store aspeed below 20 mph (30 km/h), for
example.
X If conditions permit, drive faster than 20 mph (30 km/h) and
store the speed.
X Check the activation conditions for cruise control
(Y page 173). DISTRONIC
- - - MPH An activation condition for DISTRONIC is not fulfilled.
X
Check the activation conditions for DISTRONIC (Y page 175).DISTRONIC
Override DISTRONIC is no longer controlling the speed of the vehicle.
X
Remove your foot from the accelerator pedal. DISTRONIC
Inoperative DISTRONIC is faulty or the display has failed.
X
Visit a qualified specialist workshop. DISTRONIC
Currently
Unavailable See
Operator's Manual DISTRONIC is deactivated and temporarily inoperative. Possible
causes are:
R
the DISTRONIC cover in the radiator trim is dirty.
R function is impaired due to heavy rain, snow or fog.
R the radar sensors ystem is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
R the rada rsensor system has not detected any vehicles or
stationary objects, e.g. traffic signs, for a long time.
R the system is outside the operating temperature range.
When the causes stated above no longer apply, the display
message disappears.
DISTRONIC 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 166).
X Clean the DISTRONIC cover in the radiator trim (Y page 293).
X Restart the engine. 230
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
Tire Pressure
Monitor
Inoperative No
Wheel Sensors The wheels mounted do no
thave a suitable tire pressure sensor.
The tire pressure monito ris deactivated.
X Mount wheels with suitable tire pressure sensors.
The tire pressure monitor is activated automatically after driving
for a few minutes. Check Tire(s) The tire pressure in one or more tires has dropped significantly.
The wheel position is displayed in the multifunction display.
Aw
arning tone also sounds.
G WARNING
With tire pressures which are too low, there is a ris kofthe
following hazards:
R they may burst, especially as the load and vehicle speed
increase.
R they may wear excessively and/or unevenly, which may greatly
impair tire traction.
R the driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
X Secure the vehicle against rolling away (Y page 166).
X If there is a flat tire, inspect the tires (Y page 299).
X Check the tire pressure (Y page 320).
X If necessary, correct the tire pressure. Caution: Tire
Defect The tire pressure in one or more tires has dropped suddenly. The
wheel position is shown in the multifunction display.
G WARNING
If you drive with a flat tire, there is a risk of the following hazards:
R A flat tire affects the ability to steer or brake the vehicle.
R You could lose control of the vehicle.
R Continued driving with a flat tire will cause excessive heat build-
up and possibly a fire.
There is a risk of an accident.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
X Secure the vehicle against rolling away (Y page 166).
X If there is a flat tire, inspect the tires (Y page 299).232
Display messagesOn-board computer and displays