key battery MERCEDES-BENZ S-Class 2015 W222 Owner's Guide

or
X Use the trocker switch to call up the
COMAND climate control menu. Defrosting the windows
Windows fogged up on the inside X
Activate the "Cooling with air dehumidifi-
cation" function with the Árocker
switch.
or X Activate the "Cooling with air dehumidifi-
cation" function via COMAND (see the sep- arate operating instructions).
X Switch on automatic mode using the Ã
rocker switch.
X If the windows continue to fog up, activate
the "Windshield defrosting" function using
the ¬ rocker switch. The windshield
heating is switched on.
i You should only select this setting until
the windshield is clear again.
Windows fogged up on the outside X
Activate the windshield wipers.
X Switch on automatic mode using the Ã
rocker switch.
i If you clean the windows regularly, they
do not fog up so quickly. Rear window defroster
General notes The rear window defroster has a high current
draw. You should therefore switch it off as
soon as the rear window is clear. Otherwise,
the rear window defroster switches off auto-
matically after several minutes.
If the battery voltage is too low, the rear win-
dow defroster may switch off. Activating/deactivating X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X Press the ¤rocker switch up or down.
The indicator lamp in the ¤rocker
switch lights up or goes out. 176
Operating the climate control systemsClimate control

Problems with the rear window defroster
Problem
Possible causes/consequences and
M
MSolutions The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The battery has not been sufficiently charged.
X Switch off any consumers that are not required, e.g. reading
lamps, interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window
defroster can be activated again. Activating/deactivating air-recircula-
tion mode
General notes You can also temporarily deactivate the flow
of fresh air manually if unpleasant odors are
entering the vehicle from outside. The air
already inside the vehicle will then be recir-
culated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particu-
lar at low temperatures. Only use air-recircu-
lation mode briefly to prevent the windows
from fogging up.
Activating/deactivating X
Turn the SmartKey to position 2in the igni-
tion lock (Y page 189).
X To activate: press thegrocker switch
up or down.
The indicator lamp in the grocker
switch lights up.
Air-recirculation mode is automatically acti-
vated at high levels of pollution or at high out- side temperatures. The indicator lamp in the
g rocker switch is not lit when automatic
air-recirculation mode is activated. Outside
air is added after about 30 minutes.
X To deactivate: press thegrocker
switch up or down.
The indicator lamp in the grocker
switch goes out. Air-recirculation mode deactivates automati-
cally:
R after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †)
R after approximately five minutes if cooling
with air dehumidification is deactivated
R after approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated Activating/deactivating the residual
heat function
General notes Vehicles with rear-compartment climate
control:
once the engine is switched off, it is
possible to make use of the residual heat of
the engine to continue heating or ventilating
the rear and front compartment of the vehicle
for approximately 15 minutes. If the "Residual
heat" function is set for only the front or only
the rear compartment, it is possible to con-
tinue heating or ventilating for approximately
30 minutes.
Vehicles without rear-compartment cli-
mate control: once the engine is switched
off, it is possible to make use of the residual
heat of the engine to continue heating or ven- tilating the front compartment of the vehicle
for approximately 30 minutes.
The heating or ventilation time depends on
the temperature that has been set. Operating the climate control systems
177Climate control

Front control panel
X
Turn the SmartKey to position 0in the igni-
tion lock or remove it (Y page 189).
X To activate: press theÁrocker switch
up or down.
The indicator lamp in the Árocker
switch lights up.
The blower will run at a low speed regardless
of the airflow setting.
If you activate the residual heat function at
high temperatures, only the ventilation will be activated. The blower runs at medium speed.
X To deactivate: press theÁrocker
switch up or down.
The indicator lamp in the Árocker
switch goes out.
Rear control panel X
Turn the SmartKey to position 0in the igni-
tion lock or remove it (Y page 189).
REST appears in the rear compartment dis-
play.
X To activate: press rocker switch Lup or
down (Y page 165).
The indicator lamp in rocker switch L
lights up.
X To deactivate: press rocker switch Lup
or down (Y page 165).
The indicator lamp in rocker switch Lgoes
out. REST goes out on the rear compart-
ment display.
i If you do not activate the residual heat
function, REST goes out automatically after
five minutes on the rear compartment dis-
play.
Residual heat is deactivated automatically:
R after approximately 30 minute sif the resid-
ual heat function is activated in the front or
rear compartment
R after approximately 15 minutes if the resid-
ual heat function is activated in the front
and rear compartments R
when the ignition is switched on
R if the battery voltage drops perfume atomizer
Operating the perfume atomizer G
WARNING
If children open the perfume vial, they could
drink the perfume or it could come into con-
tact with their eyes. There is a risk of injury. Do not leave children unsupervised in the vehicle.
If the perfume liquid has been drunk, consult
a doctor. If perfume comes into contact with
your eyes or skin, rinse the eyes with clean
water. If you continue to experience difficul-
ties, consult a doctor. H
Environmental note Full perfume vials must not
be disposed of with house-
hold rubbish. They must be
collected separately and
recycled to protect the envi-
ronment.
Dispose of full perfume vials
in an environmentally
responsible manner and
take them to a special waste
collection point. :
Perfume lid
; Perfume vial
The perfume atomizer helps to improve driv-
ing comfort. 178
Operating the climate control systemsClimate control

Problems with the perfume atomizer
Problem
Possible causes/consequences and
M
MSolutions The vehicle interior is
not perfumed although
the perfume atomizer is
activated. The perfume vial has not been pushed into the holder as far as it
will go.
X Slide the perfume vial into the holder as far as it will go. The perfume vial has not been adequately filled.
X Pre-filled vials: dispose of the empty vial.
X Use a new pre-filled vial.
X Refillable vials: refill the vial with a maximum of 15 ml of the
same perfume. The perfume atomizer is faulty.
X Have the perfume atomizer checked at a qualified specialist
workshop. Ionization
You can use the "Ionization" function to purify
the air in the vehicle interior and attain an
improved interior climate.
The ionization of the interior air is odorless
and cannot be perceived directly in the vehi-
cle interior.
You can switch ionization on and off using
COMAND (see the separate operating
instructions).
Ionization can only be switched on if the front automatic climate control is activated. The
side air vent on the driver's side must be
open. Pre-entry climate control via Smart-
Key
General notes The "Pre-entry climate control via SmartKey"
function is only available on PLUG-IN HYBRID
vehicles.
Before getting in, the driver's seat area or the whole interior can be briefly warmed or ven-
tilated in advance with the air from the air
vents being pre-cooled. The high-voltage battery must be sufficiently
charged before "Pre-entry climate control via
SmartKey" can be activated.
When the vehicle is pre-cooled, the following functions are activated:
R Climate control system
R Blower
R Seat ventilation
When the vehicle is pre-warmed, the following
functions are activated:
R Climate control system
R Blower
R Seat heating
R Steering wheel heating
R Exterior mirror heating
R Rear window defroster
If you have activated the following functions
using COMAND, they are activated together
with the "Pre-entry climate control via Smart-
Key" function:
R Armrest heating
R perfume atomizer
R Ionization 180
Operating the climate control systemsClimate control

Problems with "Pre-entry climate control via SmartKey"
Problem
Possible causes/consequences and
M
MSolutions "Pre-entry climate con-
trol via SmartKey" can-
not be switched on or
has switched itself off. The condition of charge of the high-voltage battery is under the
specified minimum condition of charge.
X Start the engine when the vehicle is at a standstill.
The engine powers the electric motor. The electric motor oper-
ates as a generator. The high-voltage battery is being charged.
Further information on charging the high-voltage battery via:
R a mains socket (Y page 212)
R a charging station (Y page 216)
R a wallbox (Y page 215) "Pre-entry climate control via SmartKey" has been started more
than twice with the engine switched off.
X Switch on the engine and let it run for more than ten seconds.
X Try again to switch on "Pre-entry climate control via SmartKey". Pre-entry climate control at time of
departure
Important safety notes G
WARNING
If persons, particularly children are subjected to prolonged exposure to extreme heat or
cold, there is a risk of injury, possibly even
fatal. Never leave children unattended in the
vehicle.
General notes The "Pre-entry climate control at departure
time" function is only available on PLUG-IN
HYBRID vehicles.
You can use the "Pre-entry climate control at
departure time" function to cool or heat the
vehicle interior if the engine is not running.
The "Pre-entry climate control at departure
time" function can be activated regardless of
whether or not the vehicle is connected to an electric power supply. The condition of
charge of the high-voltage battery must be
higher than the specified minimum condition of charge, however. When the vehicle is connected to an electric
power supply, priority is given to charging the
high-voltage battery to the specified mini-
mum charge. "Pre-entry climate control at
departure time" is only activated subse-
quently.
The running time of the "Pre-entry climate
control at departure time" function may be
reduced if:
R the vehicle is not connected to an electric
power supply and
R the high-voltage battery is not fully charged
With active "Pre-entry climate control at
departure time" the condition of charge of the
high-voltage battery can be reduced, even if
the charge cable connector is connected.
When the vehicle is cooled, the following
functions are activated:
R Climate control system
R Blower
R Seat ventilation 182
Operating the climate control systemsClimate control

G
WARNING
After a short time, hill start assist will no lon-
ger brake your vehicle and it could roll away.
There is a risk of an accident and injury.
Therefore, quickly move your foot from the
brake pedal to the accelerator pedal. Never
leave the vehicle when it is held by hill start
assist.
Hill start assist is not active if: R you are pulling away on a level road or on a
downhill gradient.
R the transmission is in position N.
R the electric parking brake is applied.
R ESP ®
is malfunctioning. ECO start/stop function (all vehicles
except plug-in hybrid)
Introduction This section describes the ECO start/stop
function for all vehicles except PLUG-IN
HYBRID vehicles. Information on the ECO
start/stop function in PLUG-IN HYBRID vehi-
cles (Y page 288).
The ECO start/stop function switches the
engine off automatically if the vehicle is stop- ped under certain conditions.
The engine starts automatically when the
driver wants to pull away again. The ECO
start/stop function thereby helps you to
reduce the fuel consumption and emissions
of your vehicle.
Important safety notes G
WARNING
If the engine is switched off automatically and you exit the vehicle, the engine is restarted
automatically. The vehicle may begin moving. There is a risk of accident and injury.
If you wish to exit the vehicle, always turn off
the ignition and secure the vehicle against
rolling away. General notes
:
ECO start/stop display
If the engine has been switched off automat-
ically by the ECO start/stop function, the
è ECO symbol is shown in the multifunc-
tion display.
Every time you switch on the engine using the SmartKey or the Start/Stop button, the ECO
start/stop function is activated.
The ECO start/stop function is only available in drive program E(drive program Con AMG
vehicles).
Automatic engine switch-off If the vehicle is braked to a standstill in
Dor N,
the ECO start/stop function switches off the engine automatically.
The ECO start/stop function is operational
when:
R the indicator lamp in the ECO button is lit
green.
R the outside temperature is within the range
that is suitable for the system.
R the engine is at normal operating temper-
ature.
R the set temperature for the vehicle interior
has been reached.
R the battery is sufficiently charged.
R the system detects that the windshield is
not fogged up when the air-conditioning
system is switched on. Driving
193Driving and parking Z

Problems with the engine
Problem
Possible causes/consequences and
M
MSolutions The engine does not
start. The starter motor
can be heard. R
There is a malfunction in the engine electronics.
R There is a malfunction in the fuel supply.
X Before attempting to start the engine again, turn the SmartKey
in the ignition back to position 0or press the Start/Stop button
repeatedly until all indicator lamps in the instrument cluster go out.
X Try to start the engine again (Y page 191). Avoid excessively
long and frequent attempts to start the engine as these will drain
the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak or
discharged.
X Jump-start the vehicle (Y page 432).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to a thermal load that was too high.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop. The engine is not run-
ning smoothly and is
misfiring. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
X Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it.
X Have the cause rectified immediately at a qualified specialist
workshop. The coolant tempera-
ture gage shows a value
above 248 ‡ (120 †). The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 408). Observe the warning
notes as you do so and add coolant if necessary. 196
DrivingDriving and parking

Problems with fuel and the fuel tank
Problem
Possible causes/consequences and
M
MSolutions Fuel is leaking from the
vehicle. G
WARNING
The fuel line or the fuel tank is faulty.
Risk of explosion or fire. X Apply the electric parking brake.
X Switch off the engine.
X Open the driver's door.
The on-board electronics now have status 0. This is the same as
the SmartKey having been removed.
or, if the SmartKey is inserted in the ignition lock:
X Remove the SmartKey from the ignition lock.
X Do not restart the engine under any circumstances.
X Consult a qualified specialist workshop. The fuel filler flap can-
not be opened. The fuel filler flap is not unlocked.
or
The SmartKey battery is discharged.
X Unlock the vehicle (Y page 91).
or X Unlock the vehicle using the mechanical key (Y page 93).The fuel filler flap is unlocked, but the opening mechanism is jam-
med.
X Consult a qualified specialist workshop. Charging the high-voltage battery
(plug-in hybrid vehicles) Important safety notes
G
DANGER
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. G
WARNING
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. Charging the high-voltage battery (plug-in hybrid vehicles)
209Driving and parking Z

Before charging the high-voltage battery,
check the maximum permissible charge cur-
rent for the relevant power socket.
X To adjust the setting: press button?
repeatedly until the desired setting is selec-
ted in display =.
R Two LEDs are flashing: minimum setting
R All LEDs are flashing: maximum setting
If, after the charging process, the charging
cable is:
R left connected to the power socket, the
currently selected values will be used for
the next charging process.
R removed from the power socket, the values
will be reset to the minimum setting for the next charging process. You may then need
to reset the values of the maximum charge current.
i If the vehicle requires more time than
usual when charging, check the maximum
charge current settings using the controls
on the charging cable or in the on-board
computer's menu.
Indicator lamp on the vehicle socket
When the indicator lamp on the vehicle
socket lights up, this means the following: Indicator
lamp
Ý Ý Flashes
slowly in
orange The connection between
the vehicle and the current
source is being established
before charging begins.
Flashes
slowly in
green The high-voltage battery is
being charged.
Flashes rap-
idly in red A malfunction has occurred
while charging. Indicator
lamp
Ý Ý Lights up
orange A charging break for the
high-voltage battery is tak-
ing place.
Lights up
green The high-voltage battery is
fully charged.
i
If the indicator lamp is off, lock or unlock
the vehicle with the SmartKey. The indica-
tor lamp will then display the current status
of the charging process.
i You can view the condition of charge of
the high-voltage battery in the multifunc-
tion display (see "Charging the high-voltage battery when stationary" in the "Energy
flow display" section (Y page 281)).
Connecting the charging cable :
To open the charge socket flap
; Fastener
= Vehicle charge socket flap 214
Charging the high-voltage battery (plug-in hybrid vehicles)Driving and parking

Problems with the charging process
Problem
Possible causes/consequences and
M
MSolutions The charge socket flap
cannot be opened. The charge socket flap is not unlocked.
X Unlock the vehicle (Y page 91). The SmartKey batteries are discharged.
X Unlock the vehicle manually using the SmartKey (Y page 93).The charge socket flap is unlocked, but the opening mechanism is
jammed.
X Lock and unlock the vehicle.
If, after that, the opening mechanism is still jammed:
X Consult a qualified specialist workshop. The high-voltage bat-
tery is not being
charged. A malfunction has occurred during the initialization of the charging
process.
X Ensure that the charging cable is connected to the electrical
outlet.
X Disconnect the charging cable connector from the vehicle
socket and plug it back into the vehicle socket.
X If the problem persists, consult a qualified specialist workshop. The high-voltage bat-
tery is not charged dur-
ing the charging proc-
ess when connected to
a power socket. The electrical outlet is faulty.
X Have the electrical outlet checked to test if it is functioning
properly.
or
X Use a different electrical outlet. The charging cable con-
nector cannot be
removed from the vehi- cle socket. The snap fastener on the charging cable connector is locked.
X Press and hold the button on the charging cable connector. The
snap fastener on the vehicle socket is unlocked.
X Remove the charging cable connector from the vehicle socket. The snap fastener on the charging cable connector is blocked.
X Press and hold the button on the charging cable connector.
X Try to remove the blockage. 218
Charging the high-voltage battery (plug-in hybrid vehicles)Driving and parking