engine MERCEDES-BENZ CLA 2014 Service Manual

Problems with the seat heating
ProblemPossible causes/consequences and
Solutions
The seat heating has
switched off
prematurely or cannot
be switched on.
The on-board voltage is too low because too many electrical
consumers are switched on.
XSwitch 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 will
switch back on automatically.
AMG Performance Seat
To adjust the contour of the seat and for
improved lateral support, you can individually
adjust the front seats.
Adjusting the seat cushion length
XTo extend the seat cushion:press
button.
XTo retract the seat cushion:press
button.
Adjusting the side bolsters of the seat
cushion
XTo set the side bolsters of the seat
cushion narrower:press button".
XTo set the side bolsters of the seat
cushion wider:press button!.
Adjusting the seat backrest side
bolsters
XTo set the side bolsters of the seat
cushion narrower:press button.
XTo set the side bolsters of the seat
cushion wider:press button .
Steering wheel
Important safety notes
GWARNING
You could lose control of your vehicle if you
do the following while driving:
Radjust the driver's seat, head restraint,
steering wheel or mirrors
Rfasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint,
steering wheel and mirror and fasten your
seat belt before starting the engine.
GWARNING
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.
96Steering wheel
Seats, steering wheel and mirrors

Automatic headlamp mode
GWARNING
When the lightswitch is set to, 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, turnthe light switch to
.
The automatic headlamp feature is only an
aid. The driver is responsible for the vehicle's
lighting at all times.
is the favored light switch setting. The
light setting is automatically selected
according to the brightness of the ambient
light (exception: poor visibility due to weather
conditions such as fog, snow or spray):
RSmartKey in position1in the ignition lock:
the parking lamps are switched on or off
automatically depending on the brightness
of the ambient light.
RWith the engine running: if you have
activated the daytime running lamps
function via the on-board computer, the
daytime running lamps or the low-beam
headlamps and parking lamps are switched
on or off automatically depending on the
brightness of the ambient light.
XTo switch on automatic headlamp
mode:turn the light switch to.
The daytime running lamps improve the
visibility of your vehicle during the day. The
daytime running lamps function is required by
law in Canada.
When the engine is running and the vehicle is
stationary: if you move the selector lever from
a drive position toP, the daytime running
lamps/low-beam headlamps go out after
three minutes.
When the engine is running, the vehicle is
stationary and in high ambient light: if you
turn the light switch to, you turn on the
daytime running lamps and parking lamps.
If the engine is running and you turn the light
switch to, the manual settings take
precedence over the daytime running lamps.
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
position. This is a particularly useful
function in the event of rain and fog.
XTo switch on the low-beam headlamps:
turn the SmartKey in the ignition lock to
position2or start the engine.
XTurn the light switch to.
The greenindicator lamp in the
instrumentcluster lights up.
Front fog lamps
In conditions where visibility is poor due to
fog, snow or rain, the fog lamps improve
visibility as well as making it easier for other
road users to see you. They can be operated
together with the parking lamps or together
with the parking lamps and low-beam
headlamps.
XTo switch on the front fog lamps:turn
the SmartKey in the ignition lock to position
2or start the engine.
XTurn the light switch toor.
XPress the\rbutton.
The green\rindicator lamp in the
instrumentcluster lights up.
XTo switch off the front fog lamps:press
the\rbutton.
The green\rindicator lamp in the
instrumentcluster goes out.
Only vehicles with front fog lamps are
equipped with the "fog lamp" function;
information on the fog lamp function for
vehicles with Intelligent Light System
(Ypage 108).
Exterior lighting105
Lights and windshield wipers
Z

Rear fog lamp
The rearfog lamp improves visibility of your
vehicle for the traffic behind in the event of
thick fog. Please take note of the country-
specific regulations for the use of rear fog
lamps.
XTo switch on the rear fog lamps:turn the
SmartKey in the ignition lock to position2
or start the engine.
XTurn the light switch toor.
XPress thebutton.
The yellowindicator lamp in the
instrument cluster lights up.
XTo switch off the rear fog lamp:press the
button.
The yellowindicator lamp in the
instrument cluster goes out.
iWhen the rear fog lamp is switched on,
the center brake lamp in the tail lamp
switches off due to a legal requirement.
Parking lamps
!If the battery has been excessively
discharged, 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 theparking lamps
for several hours. If possible, switch on the
right or theleft standing lamp.
XTo switch on:turn the light switch to
.
The greenindicator lamp in the
instrumentcluster lights up.
Standing lamps
Switching on the standinglamps ensures the
corresponding side of the vehicle is
illuminated.
XTo switch on the standing lamps:the
SmartKey is not in the ignition lock or it is
in position0.
XTurn the light switch to(left-hand side
of the vehicle) or(right-hand side of
the vehicle).
Combination switch
Turn signal
High-beam headlamps
Turn signal, right
"High-beam flasher
!Turn signal, left
XTo indicate briefly:press the combination
switch briefly to the pressure pointinthe
direction of arrowor!.
The corresponding turn signal flashes three
times.
XTo indicate:press the combination switch
beyond the pressure point in the direction
of arrowor!.
High-beam headlamps
XTo switch on the high-beam headlamps:
turn the SmartKey in the ignition lock to
position2or start the engine.
XTurn the light switch toor.
106Exterior lighting
Lights and windshield wipers

XPress the combination switch beyond the
pressure point in the direction of
arrow.
In theposition, the high-beam
headlamps are only switched on when it is
dark and the engine is running.
The blueindicator lamp in the
instrument cluster lights up when the high-
beam headlamps are switched on.
XTo switch off the high-beam
headlamps:move the combination switch
back to its normal position.
The blueindicator lamp in the
instrument cluster goes out.
iVehicles with Adaptive Highbeam Assist:
when Adaptive Highbeam Assist is active,
it controls activation of the high-beam
headlamps (Ypage 108).
High-beam flasher
XTo switch on:turn the SmartKey in the
ignition lock to position1or2or start the
engine.
XPull the combination switch in the direction
of arrow".
Hazard warning lamps
The hazard warning lamps automatically
switch on if:
Ran air bag is deployed
Rthe vehicle decelerates rapidly from a
speed of more than 45mph(70 km/h) and
comes to a standstill
XTo switch on the hazard warning lamps:
press button.
All turn signals flash. If you now switch on
a turn signal using the combination switch,
only the turn signal lamp on the
corresponding side of the vehicle will flash.
XTo switch off the hazard warning
lamps:press button.
The hazard warning lamps switch off
automatically if the vehicle reaches a speed
of over 6mph (10km/h) again after a full
brake application.
iThe hazard warning lamps still operate if
the ignition is switched off.
Headlamp cleaning system
The headlamps are cleaned automatically if
the "Wipe with washer fluid" function is
operated five times while the lights are on and
the engine is running (Ypage 115). When you
switch off the ignition, the automatic
headlamp cleaning system is reset and
counting is resumed from 0.
Cornering light function
The cornering light function improves the
illumination of the road over a wide angle in
the direction you are turning, enabling better
visibility in tight bends, for example. The
cornering light function can only be activated
whenthe low-beam headlamps are switched
on.
Exterior lighting107
Lights and windshield wipers
Z

Crash-responsive emergency lighting
The interiorlighting is activated automatically
if the vehicle is involved in an accident.
XTo switch off the crash-responsive
emergency lighting:press the hazard
warning lamp button.
or
XLockand then unlock the vehicle using the
key.
Replacing bulbs
Important safety notes
Xenon bulbs
GDANGER
Xenonbulbs carry a high voltage. You can get
an electric shock if you remove the cover of
the Xenon bulb and touch the electrical
contacts. There is a risk of fatal injury.
Never touch the parts or the electrical
contacts of the Xenon bulb. Always have work
on the Xenon bulbs carried out at a qualified
specialist workshop.
If your vehicle is equipped with Xenon bulbs,
you can recognize this by the following: the
cone of light from the Xenon bulbs moves
from the top to the bottom and back again
when you start the engine. For this to be
observed, the lights must be switched on
before starting the engine.
Bulbs and lamps are an important aspectof
vehicle safety.You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly.
Other bulbs
GWARNING
Bulbs, lamps and connectors can get very hot
when operating. If you change a bulb, you
could burn yourself on these components.
There is a risk of injury.
Allow these components to cool down before
changing a bulb.
Do not use a bulb that has been dropped or if
its glass tube has been scratched.
The bulb may explode if:
Ryou touch it
Rit is hot
Ryou drop it
Ryou scratch it
Only operate bulbs in enclosed lamps
designed for that purpose. Only install spare
bulbs of the same type and the specified
voltage.
Marks on the glass tube reduce the service
life of the bulbs. Do not touch the glass tube
with your bare hands. If necessary, clean the
glass tube when cold with alcohol or spirit and
rub it off with a lint-free cloth.
Protectbulbs from moisture during
operation.Do not allow bulbs to come into
contact with liquids.
There are bulbs other than the Xenon bulbs
that you cannot replace. Replace only the
bulbs listed (Ypage 111). Have the bulbs that
you cannot replace yourself changed at a
qualified specialist workshop.
If you require assistance changing bulbs,
consult a qualified specialist workshop.
If the new bulb still does not light up, consult
a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly.
Overview: changing bulbs/bulb types
You can change the following bulbs. The bulb
type can be found in the legend.
Replacing bulbs111
Lights and windshiel dw ipers
Z

Useful information
iThis Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
iRead the information on qualified
specialist workshops: (Ypage 25).
Overview of climate control systems
Important safety notes
Observe the settings recommended on the
following pages. The windows could
otherwise fog up.
To preventthe windows from fogging up:
Rswitch off climate control only briefly
Rswitch on air-recirculation mode only
briefly
Rswitch on the cooling with air
dehumidification function
Rswitch on the defrost windshield function
briefly, if required
The automatic climate control regulates the
temperature and the humidity of the vehicle
interior and filters out undesirable
substances from the air.
Automatic climate control/dual-zone
automatic climate control is only operational
when the engine is running. Optimum
operation is only achieved with the side
windows and panorama roof with power tilt/
sliding panel closed.
The residual heat function can only be
activated or deactivated with the ignition
switched off (Ypage 131).
iVentilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature (Ypage 84).
This will speed up the cooling process and
the desired vehicle interior temperature
will be reached more quickly.
iThe integrated filter filters out most
particles of dust and soot and completely
filters out pollen. With dual-zone automatic
climate control, gaseous pollutants and
odors will also be reduced.Aclogged filter
reduces the amountofair supplied to the
vehicle interior.For this reason, you should
always observe the interval for replacing
the filter, which is specified in the
Maintenance Booklet.As it depends on
environmental conditions, e.g. heavy air
pollution, the interval may be shorter than
stated in the Maintenance Booklet.
iIt is possible that the dehumidification
function of the climate control system may
be activated automatically an hour after the
SmartKey has been removed. The vehicle
is then ventilated for 30 minutes.
120Overview of climate control systems
Climate control

!Activates/deactivates air-recirculation mode (Ypage 131)
Sets the airflow (Ypage 128)
Switches cooling with airdehumidification on/off (Ypage 125)
Switches the rear window defroster on/off (Ypage 130)
Notes on using climate control
Automatic climate control
The following contains notes and
recommendations on optimum use of the
automatic climate control.
RSwitch on the air-conditioning system by
turning control knobclockwise to the
desired position (except position0).
RSet the temperature to 72 ‡ (22 †).
RRecommendation for preventing
fogged up windows with low outside
temperatures or rain:switchon for
the air distribution and switchand
off if possible (Ypage 128).
In air-recirculation mode, switchoff
(Ypage 131).
Set airflow controlto a setting between
3and6(Ypage 128).
RRecommendation for rapid cooling or
heating of the vehicle interior:briefly set
airflow controlto a setting between3
and6(Ypage 128).
RRecommendation for a constant
vehicle interior temperature:set airflow
controlto a setting between1and3
(Ypage 128).
RRecommendation for air distribution in
the winter:setand
(Ypage 128).
Recommendation for air distribution in
the summer:setorand
(Ypage 128).
ROnly use the "Windshield defrosting"
function briefly until the windshield is clear
again.
ROnly use air-recirculation mode briefly, e.g.
if there are unpleasant outside odors or
when in a tunnel. The windows could
otherwise fog up, since no fresh air is drawn
into the vehicle in air-recirculation mode.
RVehicles with COMAND:if you change the
settings of the climate control system, the
climate status display appears for three
seconds at the bottom of the screen in the
COMAND display. See also the separate
COMAND operating instructions. You will
see the currentsettings of the various
climate control functions.
ECO start/stop function
During automatic engine switch-off, the ECO
start/stop function only operates at a
reduced capacity. If you require the full
climate control output, you can switch off the
ECO start/stop function by pressing the ECO
button (Ypage 140).
122Overview of climate control systems
Climate control

ROnly available on vehicles for Canada:
use the residual heat function if you want
to heat or ventilate the vehicle interior
when the ignition is switched off. The
residual heat function can only be activated
or deactivated with the ignition switched
off.
RVehicles with COMAND:if you change the
settings of the climate control system, the
climate status display appears for three
seconds at the bottom of the screen in the
COMAND display. See also the separate
COMAND operating instructions. You will
see the currentsettings of the various
climate control functions.
ECO start/stop function
During automatic engine switch-off, the ECO
start/stop function only operates at a
reduced capacity. If you require the full
climate control output, you can switch off the
ECO start/stop function by pressing the ECO
button (Ypage 140).
Operating the climate control
systems
Switching climate control on/off
Points to observe before use
When the climate control is switched off, the
air supply and air circulation are also
switched off. The windows could fog up.
Therefore, switch off climate control only
briefly
Activating/deactivating
Automatic climate control
XTurn the SmartKey to position2in the
ignition lock (Ypage 137).
XTo switch on:turn controlclockwise to
the desired position (except position0)
(Ypage 121).
XTo switch off:turn controlcounter-
clockwise to position0(Ypage 121).
Dual-zone automatic climate control
XTurn the SmartKey to position2in the
ignition lock (Ypage 137).
XTo activate:press thebutton.
The indicator lamp in thebutton lights
up. Airflow and air distribution are set to
automatic mode.
or
XPress thebutton.
The indicator lamp in thebutton goes
out. The previously selected settings are
restored.
XTo deactivate:press thebutton.
The indicator lamp in thebutton lights
up.
iDual-zone automatic climate control:
switch on climate control primarily using
thebutton.
Activating/deactivating cooling with
air dehumidification
Points to observe before use
If you deactivate the "Cooling with air-
dehumidification" function, the air inside the
vehicle will not be cooled. The air inside the
vehicle will also not be dehumidified. The
windows can fog up more quickly. Therefore,
only deactivate the "Cooling with air-
dehumidification" function briefly.
The cooling with air dehumidification function
is only available when the engine is running.
The air inside the vehicle is cooled and
Operating the climate control systems125
Climate control

Defrosting the windshield
You can use this function to defrost the
windshield or to defrost theinside of the
windshield and the side windows.
iYou should only select the "Windshield
defrosting" functionuntil the windshield is
clear again.
XTurn the SmartKey to position2in the
ignition lock (Ypage 137).
XTo activate:press the button.
The indicator lamp in the button lights
up.
The climate control system switches to the
following functions:
Rhigh airflow
Rhigh temperature
Rairdistribution to the windshield and
front side windows
Rair-recirculation mode off
iThe "Windshield defrosting" function
automatically sets the blower output to the
optimum defrosting effect. As a result, the
airflow may increase or decrease
automatically after the button is pressed.
iYou can adjust the blower output
manually while the "Windshield defrosting"
function is in operation:
RAutomatic climate control: turn airflow
controlclockwise or counter-
clockwise (Ypage 121).
RDual-zone automatic climate control:
press theorbutton.
XTo deactivate:press the button.
The indicator lamp in the button goes
out. The previously selected settings are
restored. Air-recirculation mode remains
deactivated.
or
XDual-zone automatic climate control: press
thebutton.
The indicator lamp in the button goes
out. Airflow and air distribution are set to
automatic mode.
or
XAutomatic climate control: turn
temperature controlclockwise or
counter-clockwise (Ypage 121).
Dual-zone automatic climate control: turn
temperature controlorclockwise or
counter-clockwise (Ypage 123).
MAX COOL maximum cooling
The MAX COOL function is only available in
vehicles for the USA.
MAX COOL is only operational when the
engine is running.
XTo activate:press the
button.
The indicator lamp in the button lights up.
XTo deactivate:press the
button
again.
The indicator lamp goes out. The previously
selected settings are restored.
When you activate MAX COOL, climate
control switches to the following functions:
Rmaximum cooling
Rmaximum airflow
Rair-recirculation mode on
Defrosting the windows
Windows fogged up on theinside
Automatic climate control
XActivate the"Cooling with air
dehumidification" function.
XIf the windows continue to fog up, activate
the "Windshield defrosting" function.
iYou should only select this setting until
the windshield is clear again.
Operating the climate control systems129
Climate control

Problems with the rear window defroster
ProblemPossible causes/consequences and
Solutions
The rear window
defroster has
deactivated
prematurely or cannot
be activated.
The battery has not been sufficiently charged.
XSwitch 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-
recirculation mode
Points to observe before use
You can deactivate the flow of fresh air if
unpleasant odors are enteringthe vehicle
from outside. The air already inside the
vehicle will then be recirculated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in
particular at low temperatures. Only use air-
recirculation mode briefly to prevent the
windows from fogging up.
The operation of air-recirculation mode is the
same for all control panels.
Activating/deactivating
XTurn the SmartKey to position2in the
ignition lock (Ypage 137).
XTo activate:press thebutton.
The indicator lamp in thebutton lights
up.
iAir-recirculation mode is activated
automatically at high outside
temperatures. When air-recirculation mode
is activated automatically, the indicator
lamp in thebutton is not lit.
Outside air is added after about
30 minutes.
XTo deactivate:press thebutton.
The indicator lamp in thebutton goes
out.
iAir-recirculation mode deactivates
automatically:
Rafter approximately five minutes at
outside temperatures below
approximately 41 ‡ (5 †)
Rafter approximately five minutes if the
"Cooling with air dehumidification"
function is deactivated
Rafter approximately 30 minutes at
outside temperatures above
approximately 41‡(5†) if the "Cooling
with air dehumidification" function is
activated
Activating/deactivating the residual
heat function
The residual heat function is only available in
vehicles for Canada with 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 temperature that has been
set.
iThe blower will run at a low speed
regardless of the airflow setting.
iIf you activate the residual heat function
at high temperatures, only the ventilation
will be activated. The blower runs at
medium speed.
Operating the climate control systems131
Climate control