Page 359 of 421

Problem
Possible causes/consequences and
X XSolutions The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning. The fuel level has fallen below the reserve range. The operation of
the auxiliary heating* can no longer be guaranteed.
X
Refuel at the nearest filling station. Warning tones
Problem
Possible causes/consequences and
X XSolutions The anti-theft warning
alarm* is triggered. You have opened the vehicle with the anti-theft alarm system still
activated*.
X
Switch off the alarm (Y page 55).You hear a warning
tone. A message appears in the multi-function display.
X
See the explanations for the display message (Y page 316).You are driving with the electric parking brake applied.
X
Release the electric parking brake. The lights are still switched on when you leave the vehicle.
X
Turn the light switch to $orc.
or
X If the rear foglamp is switched on: press the light switch in to
the stop. G
Risk of injury
The driver or front passenger have not fastened their seat belt.
X Fasten your seat belt (Y page 191).You hear a warning
tone.
The
· red distance warning lamp* lights up while the vehicle
is in motion.
X Observe the explanations for the distance warning lamp*
(Y page 351). You hear a dual warning
tone.
The
9 red Blind Spot Assist* warning lamp flashes in one of
the exterior mirrors.
X Observe the explanations for the Blind Spot Assist* warning
lamp (Y page 350). 356
TroubleshootingPractical advice
* optional
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Page 367 of 421

Auxiliary heating/ventilation*
Display messages
Possible causes/consequences and
X
X Solutions FAIL The starter battery is not charged sufficiently or the system
is faulty.
X
Charge the starter battery.
X Make another attempt to switch on the auxiliary heating
using the remote control.
X Have the auxiliary heating checked at a qualified specialist
workshop. $ FAIL The signal transmission between the transmitter and the vehi-
cle is faulty.
X
Change your position in relation to the vehicle, moving
closer if necessary.
X Make another attempt to switch the auxiliary heating on or
off using the remote control. © FAIL There is not enough fuel in the fuel tank, or the auxiliary heat-
ing is faulty.
X
Refuel at the nearest filling station.
X Make another attempt to switch on the auxiliary heating
using the remote control.
X Have the auxiliary heating checked at a qualified specialist
workshop. Night View Assist*
Problem
Possible causes/consequences and
X XSolutions The picture quality of
Night View Assist has
deteriorated. The windscreen wipers are smearing the windscreen.
X
Replace the wiper blades (Y page 372). The windscreen is smeared after cleaning the vehicle in a car wash.
X
Clean the windscreen . Windscreen chip damage in the camera's field of vision.
X
Replace the windscreen. The windscreen is misted up on the inside.
X
Demist the windscreen (Y page 268). The windscreen is iced up.
X
De-ice the windscreen (Y page 267).364
TroubleshootingPractical advice
* optional
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Page 371 of 421

X
Push the battery tray back into the key
housing until the battery tray engages.
X Check the function of all key buttons on the
vehicle.
Changing a battery (key without KEY-
LESS GO*) You require a CR 2025 3 V cell battery.
X Remove the emergency key element from
the key (Y page 365). X
Press the emergency key element into the
opening in the key in the direction of
arrow ;until cover :of the battery tray
opens. Be sure that your fingers are not
stopping the cover from opening. X
Remove the cover of the battery tray.
X Repeatedly tap the key against your palm
until battery =falls out of the key.
X Insert the new battery with the positive
pole facing upwards. Use a lint-free cloth to
do so. X
Insert the front tabs of the battery tray's
cover first and then press to close it.
X Check the function of all key buttons on the
vehicle. Auxiliary heating* remote control
One 6 V pin battery, type 2CR11108 is
required. X
Prise apart the side arms of battery
cover ;and pull off battery cover ;.
X Remove old battery :.
X Insert the new battery. Observe the polarity
signs on the back of the remote control
when doing so.
X Slide battery cover ;back onto the
remote control.
X Use the remote control to check the vehi-
cle's auxiliary heating functions. 368
Replacing batteries (key, remote control, etc.)Practical advice
* optional
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Page 400 of 421

Mercedes-Benz Owner's Manual in the rele-
vant section since:
R parts and service products are matched.
R damage caused by the use of non-approved
service products is not covered by the war-
ranty.
You can recognise service products approved
by Mercedes-Benz by the following inscrip-
tion on the containers:
R MB-Freigabe (e.g. MB-Freigabe 229.51)
R MB Approval (e.g. MB Approval 229.51)
Other designations or recommendations that
relate to a level of quality or a specification in
accordance with an MB Sheet number (such
as MB 229.5) have not necessarily been
approved by Mercedes-Benz.
You can obtain further information from any
Mercedes-Benz Service Centre. G
Risk of injury
When handling, storing and disposing of any
service products, please observe the relevant
regulations, as you could otherwise endanger
yourself and others.
Keep service products away from children.
To protect your health, do not allow service
products to come into contact with your eyes
or open wounds. See a doctor immediately if
any service product is swallowed. H
Environmental note
Dispose of service products in an environ-
mentally-responsible manner. Fuel
G
Risk of explosion
Fuel is highly flammable. Fire, naked flames
and smoking are therefore prohibited when
handling fuels.
Before refuelling, turn off the engine and the
auxiliary heating*. G
Risk of injury
Do not allow fuel to come into contact with
skin or clothing.
Allowing fuels to come into direct contact with
your skin or inhaling fuel vapours is damaging
to your health.
Tank capacity Total capacity 90 l
Reserve fuel in
vehicles other
than AMG Approximately 11 l
Reserve fuel in
AMG vehicles Approximately 14 l
!
Do not use petrol to refuel vehicles with a
diesel engine. Do not use diesel to refuel
vehicles with a petrol engine. Never mix
diesel with petrol. Even small amounts of
the wrong fuel result in damage to the
injection system. Damage resulting from
adding the wrong fuel is not covered by the
implied warranty.
Further information on refuelling and on
fuels (Y page 290)
Notes on fuel consumption The vehicle will use more fuel than usual in
the following situations:
R
at very low temperatures
R in urban traffic
R on short trips
R in mountainous terrain
i Only for certain countries: the respective
current consumption and emission values
of your vehicle can be found in the COC
papers (EC CERTIFICATE OF CONFORM-
ITY). These documents are supplied when
the vehicle is delivered. Service products and capacities
397Technical data
* optional
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