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DEF (BlueTECvehicles only )
General notes
To function properly, BlueTE Cexhaus tgas after-
treatmen tmus tbe operated wit hth ereducing
agen tDEF. Addin gDE Fis on eof th etask sper -
formed durin gmaintenance .Under normal
operatin gconditions, atank of DE Flast suntil
th enext servic edue date.
Whe nth esupply of DE Fis almost used up, th e
Check Additive See Operator' sManual
messag eis shown in th emultifunction display.
If you drive th evehicle faste rthan 10 mph
(16 km/h), th eCheck Additive See Opera‐
tor's Manualmessag egoe sout after approx -
imately on eminute.
Whe nth eDE Fsupply drops to aminimum ,th e
Remaining Starts :16
messag eis shown in
th emultifunction display.
If th eRemaining Starts :16
messag e
appears in th emultifunction display, you can
start th eengin eanother 16 times .If DE Fis no t
refilled, you will subsequently be unable to
star tth eengine.
XAd dat leas t 1gal (3. 8l) of DEF.
XSwitc hon th eignition fo rat leas t60 seconds.
XStart th eengine.
iHav eth eDE Ftank refille dat aqualified spe -
cialis tworkshop .
Use th especial DE Frefill bottl ewhen addin g
DE Fbetween maintenance intervals. You can
obtain further information from an authorized
Mercedes-Ben zCente ror ,if necessary, contact
Roadside Assistanc e (
Ypage 27).
If th eoutsid etemperature is belo w12 ‡(Ò11 †)
it may be difficult to top up. If DEF is frozen and
there is an active warning indicator, it may not
be possible to add DEF. Park the vehicle in a
warmer place, e.g. in a garage, until DEF has
become fluid again. It will then be possible to
add DEF again. Alternatively, have the DEF tank
refilled at a qualified specialist workshop.
Further information about BlueTEC exhaust gas aftertreatment and DEF is available at any
authorized Mercedes-Benz Center.
Important safety notes
DEF is a water-soluble fluid for the exhaust gas
aftertreatment of diesel engines. It is:
Rnot poisonous
Rcolorless and odorless
Rnot flammable
When you open the DEF container, small
amounts of ammonia vapor may be released.
Ammonia vapors have a pungent odor and are
particularly irritating to the skin, to mucous
membranes and to the eyes. You may experi-
ence a burning sensation in your eyes, nose and
throat. Coughing and watering of the eyes are
possible.
Do not inhale ammonia vapors. Fill the DEF tank
only in well-ventilated areas.
DEF must not come into contact with your skin,
eyes or clothing and must not be swallowed.
Keep DEF away from children.
If you or other persons come into contact with
DEF, observe the following:
RRinse DEF from your skin immediately with
soap and water.
RIf DEF comes into contact with your eyes,
immediately rinse them thoroughly with clean
water. Seek medical assistance without
delay.
RIf DEF has been swallowed, rinse your mouth
out immediately. Drink plenty of water. Seek
medical assistance without delay.
RChange out of clothing contaminated with
DEF immediately.
!Only use DEF in accordance with
ISO 22241. Do not mix any additives with
DEF, and do not dilute DEF with water. This
may destroy the BlueTEC exhaust gas after-
treatment system.
!The vehicle must be parked on level ground
to fill the DEF tank. The DEF tank can only be
filled as intended with the vehicle parked on a
level surface. This avoids false level readings. Filling the tank is not permitted if the vehicle
is not parked on a level surface. There is a
danger of overfil
ling, which could result in
damage to components of the BlueTEC
exhaust gas aftertreatment.
!Rinse surfaces that have come into contact
with DEF immediately with water or remove
DEF using a damp cloth and cold water. If the
DEF has already crystallized, use a sponge
Refueling167
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Page 170 of 450

and cold water to clean it. DEF residues crys-
tallize after time and contaminate the affec-
ted surfaces.
!DEF is not a fuel additive and must not be
added to the fuel tank. If DEF is added to the
fuel tank, this can lead to engine damage.
For further information on DEF, see
(
Ypage 436).
Opening the DEF filler cap
The fuel filler flap is unlocked or locked auto-
matically when you open or close the vehicle
with the SmartKey or with KEYLESS-GO.
XSwitch the ignition off.
XPress the fuel filler flap in the direction of
arrow :.
The fuel filler flap swings up.
XTurn blue DEF fuel filler cap ;counter-clock-
wise and remove it.
DEF filler cap ;is secured with a plastic
strip.
DEF refill canisters
!Do not tighten the disposable hose with too
much force. The disposable hose may other-
wise be destroyed.
XUnscrew the cap from the opening on top of
DEF refill canister ;.
XPlace disposable hose :on the opening of
DEF refill canister ;and screw it on clock-
wise until hand-tight.
iDisposable hose :remains closed until
you fasten disposable hose :to the DEF
filler neck of the vehicle.
XPlace disposable hose :on the filler neck on
the vehicle and screw it on clockwise until
hand-tight. When you feel resistance, dispos-
able hose :is sufficiently secured.
XLift up and tip DEF refill canister ;.
iFilling stops when the DEF tank is com-
pletely filled. Do not fill the DEF tank any fur-
ther. DEF refill canister ;can be removed
when it has been only partially emptied.
XTurn disposable hose :on the filler neck of
the vehicle counter-clockwise and remove it.
XTurn disposable hose :on the opening of
DEF refill canister ;counter-clockwise and
remove it.
XReseal DEF refill canister ;with the cap.
DEF refill canisters can be obtained at many gas
stations or at an authorized Mercedes-Benz
Center. DEF refill canisters are often sold with a
filler hose. A filler hose that does not exactly fit
168Refueling
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Page 171 of 450

the vehicle's DEF tank offers no protection
against overfilling. DEF may leak if overfilled.
Mercedes-Benz offers a special disposable hose
with overfill protection. You can obtain this from
any authorized Mercedes-Benz Center. DEF is
available in a variety of containers and recepta-
cles. Only use the disposable hose with the
Mercedes-Benz DEF refill canisters.
DEF refill bottle
!Only screw on the DEF refill bottle hand-
tight. It could otherwise be damaged.
XUnscrew the protective cap from DEF refill
bottle :.
XPlace DEF refill bottle :on the filler neck as
shown and screw it on clockwise until hand-
tight.
XPress DEF refill bottle :towards the filler
neck.
The DEF tank is filled. This may take up to one
minute.
iWhen DEF refill bottle :is no longer
pressed, filling stops and the bottle may be
taken off again after being only partially emp-
tied.
XRelease DEF refill bottle :.
XTurn DEF refill bottle:counter-clockwise
and remove it.
XScrew the protective cap onto DEF refill bot-
tle : again.
DEF refill bottles can be obtained at many gas
stations or at an authorized Mercedes-Benz
Center. Refill bottles without a threaded cap do
not provide overfill protection. DEF may leak if
overfilled. Mercedes Benz offers special refill
bottles with a threaded seal. These are available
at any authorized Mercedes-Benz Center.
Closing the DEF filler cap
XInstall DEF filler cap ;on the filler neck and
turn it clockwise.
XTo close the fuel filler flap, press it in the
direction of arrow :.
XDrive faster than 10 mph (16 km/h).
TheCheck Additive See Operator's
Manualmessage goes out after approx-
imately one minute.
iIf the Check Additive See Operator'sManualmessage continues to be shown in
the multifunction display, you must add more
DEF.
Charging the high-voltage battery
Important safety notes
GDANGER
The vehicle's high-voltage electrical system is under high voltage. If you modify components
in the vehicle's high-voltage electrical system
or touch damaged components, you may be
electrocuted. The components in the vehi-
cle's high-voltage electrical system may be
damaged in an accident, although the damage
is not visible. There is a risk of fatal injury.
Following an accident, do not touch any high-
voltage components and never modify the
vehicle's high-voltage electrical system. Have
the vehicle towed away after an accident and
the vehicle's high-voltage electrical system
checked by a qualified specialist workshop.
Charging the high-voltage battery169
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GWARNING
In the event of a vehicle fire, the internal pres- sure of the high-voltage battery can exceed a
critical value. In this case flammable gas
escapes through a ventilation valve on the
underbody. The gas can ignite. There is a risk
of injury.
Leave the danger zone immediately. Secure
the danger area at a suitable distance, whilst
observing legal requirements.
GDANGER
If you use incorrectly installed mains sockets or adapters, extension cables or similar to
connect the charging cable to a mains socket,
this could lead to fires or an electric shock.
There is a risk of fatal injury.
To avoid hazardous situations, observe the
following:
ROnly connect the charging cable to mains
sockets that:
-are installed correctly and
-have been approved by an electrical spe-
cialist.
RFor safety reasons, only use the charging
cables supplied with the vehicle, or charg-
ing cables which have been approved for
use with this vehicle.
RNever use a damaged charging cable.
RDo not use:
-Extension cables
-Cable drums
-Multiple sockets
RDo not use a socket adapter to connect the
charging cable to the mains socket. The
only exception is if the adapter has been
tested and approved by the manufacturer
for charging the high-voltage battery in an
electric vehicle.
RAlways observe the safety notes in the
socket adapter's operating instructions.
GDANGER
Connecting the charging cable to the vehicle
via an incorrectly installed wallbox or by
means of adapters, extension cables or simi-
lar could cause a fire or an electric shock.
There is a risk of fatal injury.
To avoid hazardous situations, observe the
following:
ROnly connect the charging cable to a wall-
box if:
-the wallbox is installed correctly
-the wallbox has been inspected by a
qualified electrician and
-the charging cable is undamaged
RDo not extend the charging cable
RDo not use an adapter
RAlways observe the safety notes in the wall-
box's operating instructions
The vehicle's high voltage electrical system is
under high voltage.
RDo not tamper with the high-voltage compo-
nents or the orange cables of the high-voltage
electrical system.
RDo not touch high-voltage components or the
orange cables of the high-voltage electrical
system when a vehicle has been involved in a
crash.
RNever touch damaged components or the
damaged orange cables of the high-voltage
electrical system.
RDo not remove the covers of the high-voltage
electrical system components that are
marked with a warning sticker.
General notes
Method of operation
The vehicle is equipped with a high-voltage bat-
tery for driving. The high-voltage battery stores
the energy needed to operate the electric motor
and releases it again.
The electric motor uses energy that has been
stored in the high-voltage battery when pulling
away, accelerating and during the journey.
In overrun mode, kinetic energy is converted by
means of energy recuperation into electrical
170Charging the high-voltage battery
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energy and stored in the high-voltage battery.
Information on overrun mode (Ypage 253).
The high-voltage battery can be charged as fol-
lows:
Rthrough energy recuperation while the vehicle
is in motion
Rthrough the combustion engine while driving
in CHARGE operating mode (Ypage 246)
Rwith the relevant charging cable at an electri-
cal outlet while the vehicle is stationary
Rat a wallbox while the vehicle is stationary
Rat a charging station while the vehicle is sta-
tionary
The high-voltage battery can be charged in a
nominal voltage range from 100 V to 240 V.
You can view the condition of charge of the high-
voltage battery in the multifunction display. You
can find information in "PLUG-IN HYBRID oper-
ation", section "Menus and submenus" under
"Energy flow display" (
Ypage 247).
High and low outside temperatures
Low outside temperatures
At very low outside temperatures the maximum
power output of the high-voltage battery may be
reduced. The high-voltage battery is then no
longer able to provide the normal electrical
power output.
High outside temperatures
To prevent damage to the high-voltage battery
due to very high outside temperatures, the max-
imum power output of the high-voltage battery
is reduced by the vehicle.
Energy consumption and electrical
range
The maximum electrical range is generally
reduced by:
Rhigh and low outside temperatures
Roperating the climate control system
Rswitching on consumers
The battery's physical characteristics are such
that leaving the vehicle parked for long periods
at low outdoor temperatures without charging it
can lead to:
Ra reduction in battery performance
Rlonger charge times
Notes on battery care
Avoid storing or transporting the vehicle at
excessively high or low temperatures over a long
period.
If you park the vehicle and leave it stationary for
long periods:
Rcheck the condition of charge of the high-
voltage battery more often
Rconnect the vehicle to a power supply
This prevents self-discharge and damage to the high-voltage battery.
Terms of use
Please note the information on exceptions and
limitations in warranty documentation and in
the Maintenance Booklet.
Handling the charging cable and charg-
ing cable controls
Do not leave the charging cable controls
(Ypage 172) hanging loose from an electrical
outlet. Otherwise, this could result in a poor
contact with the electrical outlet and malfunc-
tions when charging the vehicle.
To ensure that the brackets within the charging
cable controls are not subjected to incorrect
loads, observe the following:
RNever lift or carry the controls by the charging
cable connector or the mains plug.
RTo transport the charging cable, the charging cable can be:
-wrapped around the controls or
-secured to the housing of the controls
Heat generated by the charging cable
and charging cable connector
Pay attention to the "Important safety notes"
(Ypage 169).
During the charging process, the charging cable
and charging cable connector may heat up.
The charging cable and the charging cable con-
nector will only heat up within the permissible
limiting values, provided that:
Rthe power supply and the charging cable are
not damaged
Rthe instructions for handling the charging
cable and controls on the charging cable are
observed
Charging the high-voltage battery171
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If the charging cable or charging cable connec-
tor become too hot, have the mains power sup-
ply checked.
Protection device against overvoltage
!Overvoltage in the mains supply may dam-
age the vehicle. For this reason, the vehicle is equipped with a protection device against
overvoltage in the mains supply. This device
may be triggered during severe thunder-
storms, for example, and may lead to the buil-
ding's fuse being tripped and an interruption
in the power supply. These functions protect
the vehicle. After the building fuse is switched
on again, the charging process resumes auto-
matically. Following an interruption in the
power supply or tripping of the building's fuse,
it may take up to 10 minutes for charging to
resume automatically.
Switch on the building protection system again
after it has been triggered. Otherwise, the
charging process cannot be continued.
General information about the charging
procedure
Pay attention to the "Important safety notes"
(Ypage 169).
The vehicle socket is located in the rear bumper
on the right below the tail lamp.
The charge socket flap and the vehicle are cen-
trally locked or unlocked simultaneously.
Charging the high-voltage battery via
the electrical outlet
Charging cable for electrical outlets
Important safety notes
!Only use the charging cable to charge the
high-voltage battery. Do not use the charging
cable for other purposes. It may otherwise be
damaged.
The vehicle is supplied with a country-specific
charging cable for connection to a mains socket.
Only use the charging cable supplied with the
vehicle or a charging cable approved for the
vehicle.
iIf you use the supplied 12 A charging cable
to charge a high-voltage battery:
Rthe charge time increases considerably
Relectrical consumption increases consider-
ably
Where possible, charge the high-voltage bat-
tery at a charging station (
Ypage 175). Only
then can certified electrical energy consump-
tion levels be reached.
iThe charging process can vary depending on
the power supply. Therefore, always observe
the local information.
Information about charging from a wallbox
(
Ypage 175).
Information on charging at a charging station
(
Ypage 175).
Stowing the charging cable
The charging cable can be stowed and secured
in the bag provided in the cargo compartment of
the vehicle.
Controls on the charging cable
:On-board voltage indicator
;Protective and indicator system display
=Charge current indicator
?Charge current setting button
When displays :and ;on the charging cable
light up, this means the following:
Display :
Lights up
greenThe on-board voltage is con-
nected. The high-voltage bat-
tery can be charged.
Flashes redThe power supply from the
building is faulty.
172Charging the high-voltage battery
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Page 175 of 450

Display;
Lightsup
greenThere are no malfunctions.
The high-voltage battery can
be charged.
Flashes redThe protective and indicator
system has detecte d amal-
function due to an internal
malfunction .The high-voltage
battery canno tbe charged.
If th econtrol detects residual curren tor amal-
function ,th echarging process is halted. Once
th emalfunction has been rectifie dth echarging
process is resumed automatically.
Fo rinformation on problem srelating to th e
charging process, see (
Ypage 176).
Setting themaximum charg ecurren t
GWARNIN G
If th echarg ecurren tdraw via amain ssocke t
is to ohigh during th echarging process, th e
external electrical system may overheat.
There is aris kof fire.
Befor ebeginning th echarging process, chec k
th emaximum permissibl echarg ecurren t
locally. Consult aqualified exper tto do so
wher enecessary.
If necessary, adjust your vehicle's settings.
!An excessive charg ecurren tcan blow afus e
or lead to overheating of th eexternal powe r
supply. Chec kwhether th eexternal powe r
supply is compatible wit hth eset charg ecur -
rent. If necessary, lower th eset charg ecur -
ren tor use another powe rsocket.
Befor estarting th echarging process at apowe r
socket, chec kth emaximum permissibl echarg e
curren tfor th erelevan tpowe rsocke tor th e
building .
You can set th emaximum permissibl echarg e
current:
Ron th echarging cable control s
Rin theSettingsmen uof th eon-boar dcom-
puter (Ypage 273)
The lower value of th etwo charg ecurren tset -
ting s –on th echarg ecable control sand in th e
on-boar dcomputer –determine sth emaximum
charg ecurrent. If you canno tset th eprecis e maximum permitte
dcharg ecurrent, select th e
next lowes tavailable value .
Only set th emaximum permitte dcharg ecurren t
in th eon-boar dcomputer men uif:
Rit is no tpossibl eto set th echarg ecurren ton
th echarging cable
Rth eprecis emaximum permitte dcharg ecur -
ren tcan only be set via th eon-boar dcom-
puter
Setting th emaximum permitte dcharg ecurren t
on th echarging cable is described below.
XTo adjust th esetting: press butto n?
repeatedly until th edesire dsetting is selec-
te din display =.
RTwo LEDs are flashing: minimum setting
RAllLEDs are flashing: maximum setting
If ,after th echarging process, th echarging cable
is:
Rlef tconnecte dto th epowe rsocket, th ecur -
rentl yselected value swill be used for th enext
charging process.
Rremove dfrom th epowe rsocket, th evalue s
will be reset to th eminimum setting for th e
next charging process. You ma
y then need to
reset th evalue sof th emaximum charg ecur -
rent.
iIf th evehicl erequire smor etime than usual
when charging ,chec kth emaximum charg e
curren tsetting susin gth econtrol son th e
charging cable or in th eon-boar dcomputer' s
menu.
Indicator lam pon th evehicle socket
Whe nth eindicator lamp on th evehicl esocke t
lights up, this mean sth efollowing:
Indicator
lam p
Flashes
orang eThe connection between th e
vehicl eand th ecurren t
source is bein gestablished
before charging begins .
Flashes
greenThe high-voltage battery is
beingcharged.
Flashes redA malfunction has occurred
while charging .
The indicator lamp goe sout
after approximately
90 seconds.
Charging the high-voltage battery17 3
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Indicator
lamp
Lights up
orangeA charging break for the high-
voltage battery is taking
place.
The indicator lamp goes out
after approximately
90 seconds.
Lights up
greenThe high-voltage battery is
fully charged.
The indicator lamp goes out
after approximately
90 seconds.
iIf the indicator lamp is off, lock or unlock the
vehicle. The indicator lamp then displays the
current status of the charging process again.
Connecting the charging cable
XShift the transmission to position P.
XSwitch the ignition off.
XPress the charge socket flap in the direction
of arrow:.
The charge socket flap swings up.
XPress fastener ;to the left.
Socket cap =is open.
XInsert the power supply plug into the electri-
cal outlet to the stop.
XInsert the charging cable connector into vehi-
cle socket ?to the stop.
Indicator lamp Afirst flashes orange and
then green.
The high-voltage battery is being charged.
If the charging cable is plugged in to the vehicle, you cannot start the engine or move the vehicle.
When the charging process begins, you can view
the charging prediction in the Settings
menu
of the on-board computer. The charging predic-
tion is either the anticipated condition of charge
at the programmed departure time or the time
when the high-voltage battery will be fully
charged (
Ypage 274).
iDepending on the temperature, the fan and
battery cooling system may audibly switch on
during the charging process.
Removing the charging cable
The high-voltage battery is fully charged when:
Rthe charge level display reaches 100% in the
multifunction display (Ypage 247)
Rthe indicator lamp in the vehicle socket lights up green after unlocking or locking the vehicle
XPress and hold button Bon the charging
cable connector and remove the charging
cable connector from the vehicle socket.
XClose socket cap =.
XClose charge socket flap :.
XRemove the mains plug from the mains
socket and safely stow away the charging
cable inside the vehicle (
Ypage 172).
174Charging the high-voltage battery
Driving and parking