key battery MERCEDES-BENZ S-Class 2015 W222 User Guide

Checking the battery
X
Press the &or% button.
The battery is working properly if battery
check lamp :lights up briefly.
The battery is discharged if battery check
lamp :does not light up briefly.
X Change the battery (Y page 94).
i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the &or% button:
R locks or
R unlocks the vehicle
i You can get a battery at any qualified spe-
cialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery.
X Take the mechanical key out of the Smart-
Key (Y page 93). X
Press mechanical key ;into the opening
in the SmartKey in the direction of the
arrow until battery compartment cover :opens. Do not hold battery compartment
cover
:closed while doing so.
X Remove battery compartment cover :. X
Repeatedly tap the SmartKey against your
palm until battery =falls out.
X Insert the new battery with the positive ter-
minal facing upwards. Use a lint-free cloth
to do so.
X Make sure that the surface of the battery is
free of lint, grease and other contaminants.
X Insert the front tabs of battery compart-
ment cover :into the housing first and
then press to close it.
X Insert mechanical key ;into the Smart-
Key.
X Check the function of all SmartKey buttons
on the vehicle. 94
SmartKeyOpening and closing

Problems with the SmartKey
Problem
Possible causes/consequences and
M
MSolutions You can no longer lock
or unlock the vehicle
using the SmartKey. The SmartKey battery is discharged or nearly discharged.
X Check the SmartKey battery (Y page 94) and replace it if nec-
essary (Y page 94).
If this does not work:
X Unlock (Y page 98) or lock (Y page 99) the vehicle using the
mechanical key. There is interference from a powerful source of radio waves.
X Unlock (Y page 98) or lock (Y page 99) the vehicle using the
mechanical key. The SmartKey is faulty.
X Unlock (Y page 98) or lock (Y page 99) the vehicle using the
mechanical key.
X Have the SmartKey checked at a qualified specialist workshop. You can no longer lock
or unlock the vehicle
using KEYLESS-GO. KEYLESS-GO was deactivated.
X Reactivate KEYLESS-GO (Y page 91). The SmartKey battery is discharged or nearly discharged.
X Check the SmartKey battery (Y page 94) and replace it if nec-
essary (Y page 94).
If this does not work:
X Unlock (Y page 98) or lock (Y page 99) the vehicle using the
mechanical key. There is interference from a powerful source of radio waves.
X Unlock (Y page 98) or lock (Y page 99) the vehicle using the
mechanical key. KEYLESS-GO is malfunctioning.
X Lock/unlock the vehicle using the remote control function of
the SmartKey.
X Have the vehicle and SmartKey checked at a qualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote
control function:
X Lock (Y page 98) or unlock (Y page 99) the vehicle using the
mechanical key.
X Have the vehicle and SmartKey checked at a qualified specialist
workshop. SmartKey
95Opening and closing Z

Problem
Possible causes/consequences and
M
MSolutions The engine cannot be
started using the
SmartKey. The on-board voltage is too low.
X Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 430).
or
X Jump-start the vehicle (Y page 432).
or
X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The
SmartKey is in the vehi-
cle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The SmartKey battery is discharged or nearly discharged.
X Check the SmartKey battery (Y page 94) and replace it if nec-
essary (Y page 94).
If this does not work:
X Start your vehicle with the SmartKey in the ignition lock. There is interference from a powerful source of radio waves.
X Start your vehicle with the SmartKey in the ignition lock. You have lost a Smart-
Key. X
Have the SmartKey deactivated at a qualified specialist work-
shop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. 96
SmartKeyOpening and closing

The trunk lid emergency release does not
unlock the trunk lid if the battery is discon-
nected or discharged.
Trunk lid emergency release light:
R emergency release button :flashes for
30 minutes after the trunk lid is opened
R emergency release button :flashes for
60 minutes after the trunk lid is closed Side windows
Important safety notes
G
WARNING
While opening the side windows, body parts
could become trapped between the side win- dow and the door frame as the side window
moves. There is a risk of injury.
Make sure that nobody touches the side win-
dow during the opening procedure. If some-
body becomes trapped, release the switch or pull the switch to close the side window again. G
WARNING
While closing the side windows, body parts in the closing area could become trapped. There is a risk of injury.
When closing make sure that no parts of the
body are in the closing area. If somebody
becomes trapped, release the switch or press
the switch to open the side window again. G
WARNING
If children operate the side windows they
could become trapped, particularly if they are left unsupervised. There is a risk of injury.
Activate the override feature for the rear side
windows. When leaving the vehicle, always
take the SmartKey with you and lock the vehi-
cle. Never leave children unsupervised in the
vehicle. Side window reversing feature
The side windows are equipped with an auto- matic reversing feature. If a solid object
blocks or restricts a side window from trav-
eling upwards during automatic operation,
the side window opens again automatically.
During the manual closing process, the side
window only opens again automatically after
the corresponding switch is released. The
automatic reversing feature is only an aid and
is no substitute for your attention when clos- ing a side window. G
WARNING
The reversing feature does not react:
R to soft, light and thin objects, e.g. small fin-
gers
R while resetting
This means that the reversing feature cannot
prevent someone being trapped in these sit-
uations. There is a risk of injury.
Make sure that no body parts are in close
proximity during the closing procedure. If
someone becomes trapped, press the switch
to open the side window again. Opening and closing the side win-
dows
The switches for all side windows are located on the driver's door. There is also a switch on
each door for the corresponding side window.
The switches on the driver's door take prec-
edence. 106
Side windowsOpening and closing

ability to react to excessively high tempera-
tures may be affected or they may even suffer burn-like injuries. There is a risk of injury.
Therefore, do not switch the seat heating on
repeatedly.
For vehicles equipped with the Warmth Com-
fort package: the armrest in the door and the center console can also be heated when you
switch on the seat heating of one of the front
seats. This can be set with COMAND (see the
separate operating instructions).
The three red indicator lamps in the button
indicate the heating level you have selected.
The system automatically switches down
from level 3to level 2after approximately
eight minutes.
The system automatically switches down
from level 2to level 1after approximately ten
minutes.
The system automatically switches off
approximately 20 minutes after it is set to
level 1.
Vehicles with the Seat Heating Plus package: you can set the distribution of the heated
sections of the seat cushion and backrest on the front seats via COMAND (see the sepa-
rate operating instructions).
Vehicles with the Seat Heating Plus package: you can set the distribution of the heated
sections of the seat cushion and backrest via
COMAND (see the Digital Operator's Man-
ual).
Vehicles with Rear Seat Entertainment Sys-
tem and electric seat adjustment: you can set
the distribution of the heated sections of the rear seat cushion and backrest via the Rear
Seat Entertainment System (see the separate operating instructions). Front seats X
Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X To switch on: press button:repeatedly
until the desired heating level is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
heating may switch off.
Rear seats X
Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X To switch on: press button:repeatedly
until the desired heating level is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
heating may switch off. Seats
135Seats, steering wheel and mirrors Z

Problems with the seat heating
Problem
Possible causes/consequences and
M
MSolutions The seat heating has
switched off prema-
turely or cannot be
switched on. The on-board voltage is too low because too many electrical con-
sumers are switched on.
X Switch off electrical consumers that you do not need, such as
the rear window defroster or interior lighting.
Once the battery is sufficiently charged, the seat heating can be
switched back on manually. Switching the seat ventilation on/off
Front seats The three blue indicator lamps in the buttons
indicate the blower setting you have selected.
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X To switch on: press button:repeatedly
until the desired blower setting is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
ventilation may switch off.
i You can open the side windows and the
sliding sunroof using the "Convenience
opening" feature (Y page 107). The seat
ventilation of the driver's seat automati-
cally switches to the highest level.
i When the vehicle is stationary, the fan
speed can be reduced automatically. This
reduces the noises of the seat ventilation. Rear seat
Switching the seat ventilation in the rear com-
partment on/off
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X To switch on: press button:repeatedly
until the desired blower setting is set.
X To switch off: press button:repeatedly
until all the indicator lamps go out.
i If the battery voltage is too low, the seat
ventilation may switch off.
i When the vehicle is stationary, the fan
speed can be reduced automatically. This
reduces the noises of the seat ventilation. 136
SeatsSeats, steering wheel and mirrors

Problems with the seat ventilation
Problem
Possible causes/consequences and
M
MSolutions The seat ventilation has
switched off prema-
turely or cannot be
switched on. The on-board voltage is too low because too many electrical con-
sumers are switched on.
X Switch off electrical consumers that you do not need, such as
the rear window defroster or interior lighting.
Once the battery is sufficiently charged, the seat ventilation can
be switched back on. Steering wheel
Important safety notes
G
WARNING
You could lose control of your vehicle if you do the following while driving:
R adjust the driver's seat, head restraint,
steering wheel or mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt before starting the engine. G
WARNING
Children could injure themselves if they
adjust the steering wheel. There is a risk of
injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never leave children unsupervised in the vehicle.
The electrically adjustable steering wheel can
still be adjusted when there is no SmartKey in
the ignition lock. Adjusting the steering wheel
:
To adjust the steering wheel position
(fore-and-aft adjustment)
; To adjust the steering wheel height
i Further related subjects:
R EASY-ENTRY/EXIT feature
(Y page 139)
R Storing settings (Y page 144)
R Operating the on-board computer
(Y page 295). Steering wheel
137Seats, steering wheel and mirrors Z

Adjusting the exterior mirrors
X
Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X Press button ;for the right-hand exterior
mirror or button =for the left-hand exte-
rior mirror.
The indicator lamp lights up in the button
that has been pressed.
The indicator lamp goes out again after
some time. You can adjust the selected
mirror using adjustment button :as long
as the indicator lamp is lit.
X Press adjustment button :up, down, or to
the left or right until you have adjusted the
exterior mirror to the correct position. You
should have a good overview of traffic con- ditions.
The convex exterior mirrors provide a larger
field of vision.
After the engine has been started, the exte-
rior mirrors are automatically heated if the
rear window defroster is switched on and the
outside temperature is low. Folding the exterior mirrors in or out
electrically X
Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X Briefly press button :.
Both exterior mirrors fold in or out.
i Make sure that the exterior mirrors are
always folded out fully while driving. They
could otherwise vibrate.
i If you are driving faster than 30 mph
(47 km/ h), you can no longer fold in the
exterior mirrors.
Setting the exterior mirrors If the battery has been disconnected or com-
pletely discharged, the exterior mirrors must
be reset. The exterior mirrors will otherwise
not fold in when you select the "Fold in mir-
rors when locking" function in the on-board
computer.
X Turn the SmartKey to position 1or 2in the
ignition lock (Y page 189).
X Briefly press button :.
Folding the exterior mirrors in or out
automatically This function is only available in vehicles for
Canada.
When the
Automatic Automatic Mirror MirrorFolding
Folding func-
tion is activated in COMAND (see the sepa-
rate operating instructions): Mirrors
141Seats, steering wheel and mirrors Z

causes of poor visibility due to the weather
conditions such as spray. There is a risk of an
accident.
In such situations, turn the light switch to
L.
The automatic headlamp feature is only an
aid. The driver is responsible for the vehicle's lighting at all times.
Canada only:
The daytime running lamps improve the visi-
bility of your vehicle during the day. The day-
time running lamps function is required by law in Canada. It cannot therefore be deactivated.
When the engine is running and the vehicle is
stationary: if you move the selector lever from
a drive position to P, the daytime running
lamps/low-beam headlamps go out after
three minutes.
When the engine is running, the vehicle is
stationary and in bright ambient light: if you
turn the light switch to T, the daytime
running lamps and parking lamps switch on.
If the engine is running and you turn the light switch to L, the manual settings take
precedence over the daytime running lamps.
USA only:
The daytime running lamps improve the visi-
bility of your vehicle during the day. To do this,
the daytime running lamps function must be
switched on using the on-board computer
(Y page 312).
If the engine is running and you turn the light
switch to TorL, the manual settings
take precedence over the daytime running
lamps.
à is the favored light switch setting. The
light setting is automatically selected accord- ing to the brightness of the ambient light
(exception: poor visibility due to weather con-
ditions such as fog, snow or spray):
R SmartKey in position 1in the ignition lock:
the parking lamps are switched on or off automatically depending on the brightness
of the ambient light.
R With the engine running: if you have acti-
vated the "daytime running lamps" function
via the on-board computer, the daytime
running lamps or the parking lamps and the
low-beam headlamps are switched on or off automatically depending on the brightnessof the ambient light.
X To switch on automatic headlamp
mode: turn the light switch to Ã.
Low-beam headlamps
Even if the light sensor does not detect that it is dark, the parking lamps and low-beam
headlamps switch on when the ignition is
switched on and the light switch is set to the L position. This is a particularly useful
function in the event of rain and fog.
X To switch on the low-beam headlamps:
turn the SmartKey in the ignition lock to
position 2or start the engine.
X Turn the light switch to L.
The green Lindicator lamp in the instru-
ment cluster lights up.
Parking lamps ! If the battery has been excessively dis-
charged, the parking lamps or standing
lamps are automatically switched off to
enable the next engine start. Always park
your vehicle safely and sufficiently lit
according to legal standards. Avoid the
continuous use of the Tparking lamps
for several hours. If possible, switch on the
X right or the Wleft standing lamp.
X To switch on: turn the light switch to T.
The green Tindicator lamp in the instru-
ment cluster lights up.
Standing lamps
Switching on the standing lamps ensures the
corresponding side of the vehicle is illumina-
ted. Exterior lighting
151Lights and windshield wipers Z

users are recognize, the high-beam head-
lamps are switched on.
If you are driving at speeds below approx-
imately 16 mph (25 km/h) or the roads are
adequately illuminated:
The high-beam headlamps are switched off automatically. The Kindicator lamp in
the instrument cluster goes out. The _
indicator lamp in the multifunction display
remains lit.
X To switch off: move the combination
switch back to its normal position or move the light switch to another position.
The _ indicator lamp in the multifunc-
tion display goes out. Headlamps fogged up on the inside
Certain climatic and physical conditions may
cause moisture to form in the headlamp. This moisture does not affect the functionality of
the headlamp. Interior lighting
Overview of interior lighting
Front overhead control panel :
p To switch the left-hand front reading
lamp on/off
; | To switch the automatic interior
lighting control on/off
= c To switch the front interior lighting
on/off ?
u To switch the rear interior lighting
on/off
A p To switch the right-hand front read-
ing lamp on/off
Control panel in the grab handle (rear
compartment) X
To switch on on the corresponding side
of the vehicle: press button;.
Reading lamp :and the make-up lamp
light up.
X To switch off: press button;.
Press once: the make-up lamp goes out.
Press twice: reading lamp :goes out.
X To switch on on both sides of the vehi-
cle: press button =.
Reading lamp :and the make-up lamp
light up.
X To switch off: press button=.
Reading lamp :and the make-up lamp go
out. Interior lighting control
General notes In order to prevent the vehicle's battery from
discharging, the interior lighting functions are
automatically deactivated after some time
unless the SmartKey is in position 2in the
ignition lock.
The color, brightness, zone and display lamp
for the ambient lighting can be set using Interior lighting
155Lights and windshield wipers Z