2016 MERCEDES-BENZ CLS battery

Problem
Possible causes/consequences and P Solutions
The engine cannot be
started using the Smart-
Key. 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 293).
or X
Jump-start the vehicle ( Y
page 294).
or X
Consult a qualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
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 workshop. 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.
Doors
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
Unlocking and opening doors from
the inside You can open a door from inside the vehicle
even if it has been locked.
If the vehicle has previously been locked from
the outside, opening a door from the inside will
trigger the anti-theft alarm system. Switch off
the alarm ( Y
page 75).
You can only open the rear doors from inside the
vehicle if they are not secured by the child-proof
locks ( Y
page 63). Doors 81
Opening and closing Z

Opening and closing X
To open: pull remote operating switch for
trunk lid C until the trunk lid opens.X
To close: press remote operating switch for
trunk lid C until the trunk lid is completely
closed.
You can open and close the trunk lid from the
driver's seat when the vehicle is stationary and
unlocked.
Unlocking the trunk
! The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
If the trunk cannot be unlocked with the Smart-
Key or KEYLESS-GO, use the mechanical key.
If you use the mechanical key to unlock and
open the trunk lid, the anti-theft alarm system
will be triggered. Switch off the alarm
( Y
page 75). X
Take the mechanical key out of the SmartKey
( Y
page 78).X
Insert the mechanical key into the trunk lid
lock as far as it will go. X
Turn the mechanical key from position G
counter-clockwise as far as it will go to posi-
tion H . Simultaneously pull the trunk lid han-
dle.
The trunk is unlocked. X
Turn the mechanical key back to position G
and remove it. X
Insert the mechanical key into the SmartKey
( Y
page 78).
Trunk emergency release You can open the trunk lid from inside the vehi-
cle with the emergency release button.
X
Press emergency release button C briefly.
The trunk lid unlocks and opens.
The trunk lid can be unlocked and opened with
the trunk lid emergency release when the vehi-
cle is stationary or while driving.
The trunk lid emergency release does not open
the trunk lid if the battery is disconnected or
discharged.
Trunk lid emergency release light: R
Emergency release button C flashes for
30 minutes after the trunk lid is opened. R
Emergency release button C 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.86
Side windows
Opening and closing

X
Turn the SmartKey to position 1 or 2 in the
ignition lock ( Y
page 127).X
To switch on: press button C repeatedly
until the desired ventilation level is set. X
To switch off: press button C 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 slid-
ing sunroof using the "Convenience opening"
feature ( Y
page 88). The seat ventilation of
the driver's seat automatically switches to the
highest level. Seats 99
Seats, steering wheel and mirrors Z

Problems with the seat heating or seat ventilation Problem
Possible causes/consequences and P Solutions
The seat heating or seat
ventilation has switched
off prematurely or can-
not be switched on. The on-board voltage is too low because too many electrical consum-
ers 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 or seat
ventilation can be switched back on manually.
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 electri-
cally
C
To adjust the steering wheel height D
To adjust the steering wheel position (fore-
and-aft adjustment)
i Further related subjects: R
EASY-ENTRY/EXIT feature ( Y
page 102)R
Storing settings ( Y
page 105)
Steering wheel heating
Switching on/off100
Steering wheel
Seats, steering wheel and mirrors

Problems with the steering wheel heating Problem
Possible causes/consequences and P Solutions
The steering wheel heat-
ing has switched off pre-
maturely or cannot be
switched on. The on-board voltage is too low because too many electrical consum-
ers 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 steering wheel heating
will switch back on automatically.
EASY-ENTRY/EXIT feature
Important safety notes
G WARNING
When the EASY-ENTRY/EXIT feature adjusts
the steering wheel, you and other vehicle
occupants – particularly children – could
become trapped. There is a risk of injury.
While the EASY-ENTRY/EXIT feature is mak-
ing adjustments, make sure that no one has
any body parts in the sweep of the steering
wheel.
Move the steering wheel adjustment lever if
there is a risk of entrapment by the steering
wheel. The adjustment process is stopped.
Vehicles with a memory function: if there is a
risk of becoming trapped by the steering wheel,
you can also one of the memory function posi-
tion buttons. The adjustment process is stop-
ped.
G WARNING
If children activate the EASY-ENTRY/EXIT fea-
ture, they can become trapped, particularly
when unattended. 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.
G WARNING
If you drive off while the EASY-ENTRY/EXIT
feature is making adjustments, you could lose
control of the vehicle. There is a risk of an
accident. Always wait until the adjustment process is
complete before driving off.
The EASY-ENTRY/EXIT feature makes getting in
and out of your vehicle easier.
You can activate and deactivate the EASY-
ENTRY/EXIT feature in the on-board computer
( Y
page 208).
Position of the steering wheel when the
EASY-ENTRY/EXIT feature is active The steering wheel swings upwards when you: R
remove the SmartKey from the ignition lock R
with KEYLESS-GO: open the driver's door;
KEYLESS-GO must be in position 1R
with the SmartKey: open the driver's door;
the SmartKey is in position 0 or 1 must be in
the ignition lock ( Y
page 127).
i The steering wheel only moves upwards if it
has not already reached the upper stop.
Position of the steering wheel for driv-
ing The steering wheel is moved to the last selected
position when: R
the driver's door is closed R
with KEYLESS-GO: you press the Start/Stop
button once
or R
with the SmartKey: you insert the SmartKey
into the ignition lock
When you close the driver's door with the igni-
tion switched on, the steering wheel is also
automatically moved to the previously set posi-
tion.102
Steering wheel
Seats, steering wheel and mirrors

Folding the exterior mirrors in or out
electrically
This function is only available in Canada. X
Turn th e SmartKey to position 1 or 2 in th e
ignition loc k ( Y
page 127).X
Briefly press butto n C .
Both exterio r mirror s fol d in or out .
i Mak e sure that th e exterio r mirror s are
always folded out fully while driving . They
could otherwise vibrate .
i If you are driving faste r than 30 mph
(47 km/h), you can no longer fol d in th e exte -
rio r mirrors.
Setting the exterior mirrors If th e battery has been disconnected or com-
pletely discharged, th e exterio r mirror s must be
reset . The exterio r mirror s will otherwise no t
fol d in when you select th e "Fold in mirror s when
locking" function in th e on-board computer
( Y
page 208). X
Turn th e SmartKey to position 1 in th e ignition
loc k ( Y
page 127).X
Briefly press butto n C .
Folding the exterior mirrors in or out
automatically This function is only available in Canada.
If th e "Fold in mirror s when locking" function is
activated in th e on-board computer
( Y
page 208): R
th e exterio r mirror s fol d in automatically as
soo n as you loc k th e vehicl e from th e outside .R
th e exterio r mirror s fol d out again automati-
call y as soo n as you unlock th e vehicl e and
then open th e driver' s or front-passenger
door . i If th e exterio r mirror s have been folded in
manually, they do no t fol d out .
Exterior mirror pushed out of position If an exterio r mirror has been pushed out of
position , procee d as follows :X
Vehicles without electricall y folding exte-
rior mirrors : mov e th e exterio r mirror int o
th e correct position manually. X
Vehicles with electricall y folding exterior
mirrors : press and hold mirror-foldin g butto n
until you hear a click and then th e mirror s
engage in position ( Y
page 104).
The mirror housing is engage d again and you
can adjust th e exterio r mirror s as usual
( Y
page 103).
Automatic anti-glare mirrors
G WARNIN G
Electrolyte may escape if th e glass in an auto -
matic anti-glare mirror breaks . The electrolyt e
is harmful and causes irritation . It must no t
come int o contact wit h your skin, eyes, res -
piratory organs or clothing or be swallowed.
Ther e is a ris k of injury.
If you come int o contact wit h th e electrolyte,
observ e th e following: R
Rins e off th e electrolyt e from your skin
immediately wit h water.R
Immediately rinse th e electrolyt e out of
your eyes thoroughly wit h clean water.R
If th e electrolyt e is swallowed, immediately
rinse your mout h out thoroughly. Do no t
induce vomiting . R
If electrolyt e comes int o contact wit h your
skin or hair or is swallowed, seek medical
attention immediately. R
Immediately chang e out of clothing whic h
has come int o contact wit h electrolyte.R
If an allergic reaction occurs, seek medical
attention immediately.104
Mirrors
Seats, steering wheel and mirrors

light switch to ` , the daytime running lamps
and parking lamps switch on.
If the engine is running and you turn the light
switch to X , the manual settings take prec-
edence over the daytime running lamps.
USA only:
The daytime running lamps improve the visibility
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 206).
If the engine is running and you turn the light
switch to ` or X , the manual settings
take precedence over the daytime running
lamps.
Low-beam headlamps
G WARNING
When the light switch is set to X , the low-
beam headlamps may not be switched on
automatically if there is fog, snow or other
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
X .
Even if the light sensor does not detect that it is
dark, the parking lamps and low-beam head-
lamps switch on when the ignition is switched on
and the light switch is set to the X 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 posi-
tion 2 or start the engine.X
Turn the light switch to X .
The green X indicator lamp in the instru-
ment cluster lights up.
Parking lamps
! If the battery charge is very low, the parking
lamps or standing lamps are automatically
switched off to enable the next engine start.
Always park your vehicle safely and suffi-
ciently lit according to legal standards. Avoid
using the parking lamps ` over a period of
several hours. If possible, switch on the right-
hand d or left-hand c standing lamp. X
To switch on: turn the light switch to ` .
The green ` indicator lamp in the instru-
ment cluster lights up.
Standing lamps Switching on the standing lamps ensures the
corresponding side of the vehicle is illuminated. X
To switch on the standing lamps: the
SmartKey should not be in the ignition lock or
it should be in position 0 .X
Turn the light switch to c (left-hand side of
the vehicle) or d (right-hand side of the
vehicle).
Combination switch
C
High-beam headlamps D
Turn signal, right

Problems with the rear window defroster Problem
Possible causes/consequences and P Solutions
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.
Switching air-recirculation mode
on/off
General notes You can deactivate the flow of fresh air if
unpleasant odors are entering the vehicle from
outside. The air already inside the vehicle will
then be recirculated.
If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Activating or deactivating X
Turn the SmartKey to position 2 in the ignition
lock ( Y
page 127).X
To activate: press the r button.
The indicator lamp in the r button lights
up.
i Dual-zone automatic climate control: air-
recirculation mode is automatically activated
at high outside temperatures.
3-zone automatic climate control: air-recircu-
lation mode is automatically activated at high
levels of pollution or at high outside temper-
atures.
When air-recirculation mode is activated
automatically, the indicator lamp above the
r button does not light up. Outside air is
added after about 30 minutes. X
To deactivate: press the r button.
The indicator lamp in the r button goes
out. i Air-recirculation mode deactivates auto-
matically: 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
Switching the residual heat on or off
General notes The residual heat function is only available with
dual-zone automatic climate control.
It is possible to make use of the residual heat of
the engine to continue heating the vehicle for
approximately 30 minutes after the engine has
been switched off. The heating time depends on
the set interior temperature.
Activating/deactivating X
Turn the SmartKey to position 0 in the ignition
lock or remove it ( Y
page 127).X
To activate: press the K button.
The indicator lamp in the K button lights
up.
i If the residual heat function is activated, the
windows may fog up on the inside.
i The blower will run at a low speed regardless
of the airflow setting.124
Operating the climate control systems
Climate control