2013 MERCEDES-BENZ R-CLASS FAMILY TOURER engine

Display messages Possible causes/consequences and
M Solutions
?
Coolant Stop car,
switch engine off The coolan
tis too hot.
Aw arning tone also sounds.
G WARNING
Do no tdrive when youre ngine is overheated. Thi scan cause some
fluids which may have leaked into the engine compartmen tto
catch fire.
Stea mfrom the overheated engine can also cause serious burns
which can occur just by opening the hood.
There is a risk of injury.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 166).
X Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Do not start the engine again until the display message goes out
and the coolant temperature is under 248 ‡ (120 †).
Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 248 ‡ (120 †). Display messages
225On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
# The battery is no
tbeing charged.
Aw arning tone also sounds.
Possible causes are:
R a defective alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull ove rand stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Ope nthe hood.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is not damaged:
X Visit a qualified specialist workshop. #
Battery /
Alternator Stop
Vehicle The battery is defective.
You will need to use considerably more force to brake. The brake
pedal travel and braking distance will increase. If necessary,
depress the brake pedal with maximum force.
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 Apply the parking brake.
X Consult a qualified specialist workshop. 4
Check engine oil
level at next
refueling The engine oil level has dropped to the minimum level.
Aw
arning tone also sounds.
X Chec kthe oil level when next refueling, at the latest
(Y page 286).
X If necessary, add engine oil (Y page 286).
X Have the engine checked at a qualified specialist workshop if
engine oil needs to be added more often than usual.
! Avoid long journeys with too little engine oil. The engine will
otherwise be damaged.
Information on approved engine oils can be obtained from any
qualified specialist workshop or on the Internet at http://
www.mbusa.com (USA only). 226
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
8
Reserve Fuel The fuel level has dropped into the reserve range.
X
Refuel at the neares tgas station. C There is only a very small amoun
toffuel in th efuel tank.
X Refuel at the neares tgas statio nwithout fail. 8
Gas Cap Open The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
X
Check that the fuel filler cap is correctly closed.
If the fuel filler cap is not correctly closed:
X Close the fuel filler cap.
If the fuel filler cap is correctly closed:
X Visit a qualified specialist workshop. 8
Ultra Low-sulfur
Diesel Fuel Only Vehicles with a diesel engine: the fuel level has fallen below the
reserve range.
X
Refuel at the nearest gas station.
X Only use commercially available vehicular ULTRA-LOW SULFUR
HIGHWAY DIESEL FUEL (ULSD, 15ppm SULFUR MAXIMUM). ¸
Replace air filter Vehicles with a diesel engine: the engine air filter is dirty and must
be replaced.
X
Visit a qualified specialist workshop. ·
Clean Fuel Filter Vehicles with a diesel engine: there is water in the fuel filter. The
water must be drained off.
X
Visit a qualified specialist workshop. Ø
Check
Additive See
Operator's Manual The DEF tank is almost empty.
X
Have the DE Ftank refilled as soon as possible at a qualified
specialist workshop (Y page 164).Ø
Remaining Starts:
16 The DE
Flevel has fallen to a minimum. You can start the engine a
further 16 times.
X Have the DEFt ank refilled as soon as possible at a qualified
specialist workshop (Y page 164).
i You can start the engine a further 16 times. If DE Fis not added,
it will then not be possible to restart the engine. add DEF tank
with approximately 1gal (3. 8l) DEF( Ypage 164). Display messages
227On-board computer and displays Z

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
h
Tire Pressure
Check Tires The tire pressure in one or more tires has dropped significantly.
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. h
Please
correct the
tire pressures The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
X
Check the tire pressures at the next opportunity (Y page 320).
X If necessary, correct the tire pressure. Vehicle
Display messages Possible causes/consequences and
M Solutions
Shift to P or N to
start engine. You have attempted to start the engine with the transmission in
position
Ror D.
X Shift the transmission to position Por N. Auxiliary Battery
Malfunction The auxiliary battery for the automatic transmission is no longer
being charged.
X
Visit a qualified specialist workshop at the next opportunity.
X Until then, set the automatic transmission to position Pbefore
you switch off the engine.
X Before leaving the vehicle, apply the parking brake.
X Secure the vehicle against rolling away (Y page 166).234
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
Depress brake to
shift out of P. You have attempted to mov
ethe transmission selector lever to
position D,Ror Nwithout depressing the brake pedal.
X Depress the brake pedal. Door Open Vehicle
Not In Park The driver's door is open and the transmission is in position
R,N
or D.
X Shift the transmission to position P.
X Secure the vehicle against rolling away (Y page 166).Drive to workshop
without shifting
gears. You cannot change the transmission position due to a malfunction.
If transmission position
Dis selected:
X Drive to a qualified specialist workshop without shifting the
transmission from position D.
If transmission position R,Nor Pis selected:
X Notify a qualified specialist workshop or breakdown service. Only shift to P
when vehicle is at
a standstill. The vehicle is moving.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Shift the transmission to position P.E The hood or the tailgate is open.
G WARNING
The open hood may block your view when the vehicle is in motion.
There is a risk of an accident.
When the engine is running, exhaust gases can enter the vehicle
interior if the tailgate is open.
There is a risk of poisoning.
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 Close the hood or tailgate. You have attempted to lock the vehicle with KEYLESS-GO while
the tailgate or door is open.
X
Close all the doors and/or the tailgate. ; At least one door is open.
X
Close all the doors. Display messages
235On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
+
Change key
batteries The batteries of the KEYLESS-GO key are discharged.
X
Change the batteries ( Ypage 80). +
Don't forget your
key This display message is displayed fo
ramaximum of 60 seconds
and is simply a reminder.
You have opened the driver's door with the engine switched off.
The KEYLESS-GO key is not in the ignition lock.
X Remember to take the KEYLESS-GO key with you when you
leave the vehicle. +
Key not detected
(red display message) The KEYLESS-GO key is not in the vehicle.
Aw
arning tone also sounds.
If the engine is switched off, you can no longer loc kthe vehicle
centrally or start the engine.
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 Locate the KEYLESS-GO key. The KEYLESS-GO key is not detected while the engine is running
because there is interference from a strong source of radio waves.
Aw
arning tone also sounds.
X Pull ove rand stop the vehicle safely as soo nas possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 166).
X Operate the vehicle with the SmartKey in the ignition lock. +
Key not detected
(white display
message) The KEYLESS-GO key cannot be detected at present.
X
Change the location of the SmartKey with the KEYLESS-GO
functions in the vehicle.
If the KEYLESS-GO key is still not detected:
X Operate the vehicle with the SmartKey in the ignition lock. +
Key detected in
vehicle The KEYLESS-GO key has been detected inside the vehicle during
locking.
X
Remove the KEYLESS-GO key from the vehicle. +
Pull starting
button out then
insert key The KEYLESS-GO key can continuously not be detected.
X
Insert the SmartKey into the ignition lock and turn it to the
desired position.
X Visit a qualified specialist workshop. Display messages
237On-board computer and displays Z