2012 MERCEDES-BENZ CLS COUPE keyless

Display messages Possible causes/consequences and
M Solutions
Â
Change key batter‐
ies The batterie
softheKEYLESS-GO ke yare discharged.
X Change th ebatterie s(Ypage 79). Â
Key not detected
(re
dd isplay message) The KEYLESS-GO ke
yisnotin th evehicle.
Aw arning tone also sounds.
If th eengineiss witched off ,you can no longer loc kthe vehicle
centrally or start the engine.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 159).
X Locate the KEYLESS-GO key. The KEYLESS-GO key is not detected while the engine is running
because there is interference from
astrongs ource of radio waves.
Aw arning tone also sounds.
X Pull ove rand stop the vehicl esafelyass oonasp ossible,p aying
attention to road and traffic conditions.
X Secure the vehicle against rolling away( Ypage 159).
X Operate the vehicle with the key in the ignition lock if necessary. Â
Key not detected
(white displaym
es-
sage) The KEYLESS-GO key cannot be detected at present.
X
Change the location of the key with the KEYLESS-GO functions
in the vehicle.
If the KEYLESS-GO key is still not detected:
X Operate the vehicle with the key in the ignition lock if necessary. Â
Key still in vehi‐
cle The KEYLESS-GO key has been detected inside the vehicle during
locking.
X
Remove the KEYLESS-GO key from the vehicle. Display messages
257On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
Â
Remove starting
button
,then insert key The KEYLESS-GO ke
yisnot continually detected.
KEYLESS-GO is temporaril ymalfunctioning or is defective. Awarn-
ing tone also sounds.
X Inser tthe keyintot he ignition loc kand tur nittot hedesired
position.
X Visi taq ualified specialist workshop. Â
Close doors to
lock vehicle At least one door is open.
Awarning tone also sounds.
X Close all door sand loc kthe vehicle again. Warning and indicator lamps in the
instrument cluster
Warning and indicator lamps over-
view
L Dipped-beam headlamps
(Ypage 111)
T Side lamps (Y page 112)
K Main-beam headlamps
(Ypage 113)
#! Turn signals (Y page 113)
R Rear foglamp (Y page 112)
ü Seat belts (Y page 259)
J Brakes (Ypage 260)
! ABS (Ypage 261)
÷ ESP®
(Y page 263)
å ESP®
OFF (Y page 263)
M SPORT handling mode in AMG
vehicles (Ypage 264)
6 SRS (Ypage 266)
; Enginediagnostics
(Y page 266)
8 Reserve fuel (Y page 267)
? Coolant (Ypage 267)
· Distancewarning signal
(Y page 269) %
Diesel engine: preglow
(Ypage 143)
h Tyre pressure monitor
(Ypage 270) 258
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variation sare pos-
sible. Not ethat your vehicle may not be
equipped with all of the function sdescri-
bed. This is also the case for system sand
function srelevan ttosafety.
i Read the information on qualified special-
ist workshops: (Y page 23). Engine compartment
Bonnet
Opening the bonnet G
WARNING
Do not pull the release lever while the vehicle
is in motion. If you do so, the bonnet may open
up and block your view. G
WARNING
There is arisk of injury if the bonnet is open,
even if the engin eisnot running.
Some engin ecomponents can become very
hot.
To avoid the risk of burns, only touc hthose
components described in the Owner's Manual
and observ ethe relevan tsafet ynotes. G
WARNING
The radiator fan between th eradiator and the
engine can start automatically, even if th ekey
has been remove dfromt heignitio nlock. For
this reason, you must not reach into the fan
rotation area. You could otherwise be injured. Vehicles with
apetrol engine: The elec-
tronic ignitio nsystem uses high voltage. For
this reason ,you mus tnever touch ignition
system components( ignition coil, ignition
cables, spark plug connectors or test socket)
while:
R the engine is running
R the engine is being started
R the ignition is switched on and the engine
is being cranked by hand
You could otherwise suffer an electric shock
and be seriously or even fatally injured.
Vehicles with adiesel engine: The elec-
tronic injection control uses high voltage. For
this reason ,you must never touc hinjection
system components while:
R the engin eisrunning
R the engin eisbeing started
R the ignition is switched on
You could otherwise suffer an electric shock
and be seriously or even fatally injured. G
WARNING
The windscreen wipers and wiper linkage
could be set in motion.
When the bonnet is open, you or others could
be injured by the wiper linkage.
Make sure that the windscreen wipers are
switched off. Remove the key or make sure
that no ignition position has been selected
with KEYLESS-GO. All indicator lamps must be
off in the instrumen tpanel.
! Make sure that the windscreen wipers are
not folded away from the windscreen .Oth-
erwise, yo ucould damage the windscreen
wipers or the bonnet. 296
Engine compartmentMaintenance and care

X
Replac ecap : on th efiller neck and turn
clockwise.
Mak esuret hatthe cap locks securel yinto
place.
X Chec kthe oil level again with the oil dip-
stick (Y page 298).
For further information on engine oil, see
(Y page 363). Other service products
Checking the coolant level G
WARNING
The cooling system is pressurised. Therefore,
only unscrew the cap once the engine has
cooled down. The coolant temperature gauge
must display less than 70 †.Otherwise, you
could be scalded if hot coolant escapes. X
Park the vehicl eonalevel surface.
Onl ycheck the coolant level if the vehicle
is on alevel surface and the engine has
coole ddown.
X Turn the key to position 2in the ignition
lock (Y page 141).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (Y page 141).
X Check the coolant temperatur edisplay in
the instrument cluster.
Th ec oolant temperatur emustbeb elow
70 †.
X Turn the key to position 0(Y page 141) in
the ignition lock. X
Slowl yturnc ap : half aturna nti-clock-
wise to allow exces spressure to escape.
X Turn cap :further anti-clockwis eand
remove it.
If th ecoolan tisatt heleve lofm arkerbar
= in th efille rneck when cold, ther eis
enough coolant in coolant expansion
tank ;.
If the coolant level is approximately
1.5 cm above marker bar =in the filler
neckw hen warm, there is enough coolant
in coolant expansion tank ;.
X If necessary, top up with coolant that has
been tested and approved by Mercedes-
Benz.
X Replace cap :and turn it clockwise as far
as it will go.
For further information on coolant, see
(Y page 365).
Topping up the windscreen washer sys-
tem/headlam pcleaning system G
WARNING
Windscreen washer fluid/antifreez eishighly
flammable. Avoid spilling windscreen washer
fluid/antifreez eonhot engin ecomponent sas
it can ignit eand burn. Severe burns could be
the result. X
To open: pull cap:upwards by the tab.
X Top up with the premixed washer fluid.
X To close: press cap :ontothe filler neck
until it engages. Engine compartment
299Maintenance and care Z

R
Vehicles with akey:
do not remove the key from the ignition
lock. Do not open the driver's door or
front-passenger door when the engine is
switched off. Otherwise, the automatic
transmission selects park position P
automatically and locks the wheels. You
can prevent this by shifting the auto-
matic transmission to Nbeforehand.
R Vehicles with KEYLESS-GO:
do not open the driver's door or front-
passenger door when the engine is
switched off. Otherwise, the automatic
transmission selects park position P
automatically and locks the wheels.
Observe the following to make sure that the
automatic transmission stays in position N:
X Make sure the vehicle is stationary and the
ignition is switched off.
X Turn the key to position 2(Ypage 141) in
the ignition lock.
Use the key instead of the Start/Stop but-
ton on vehicles with KEYLESS-GO.
X Depress and hold the brake pedal.
X Shift the automatic transmission to posi-
tion N.
X Release the brake pedal.
X Release the electric parking brake.
X Switch off the ignition and leave the key in
the ignition lock.
You can wash the vehicle in an automatic car
wash from the very start.
Wash off excess dirt before cleaning the vehi-
cle in an automatic car wash.
After using an automatic car wash, wipe off
wax from the windscreen and the wiper
blades. This will prevent smears and reduce
wiping noises caused by residueont he wind-
screen.
Washing by hand In some countries, washing by hand is only
allowed at specially equipped washing bays. Observe the legal requirements for each indi-
vidual country.
X Do not use hot water and do not wash the
vehicle in direct sunlight.
X Use asoft sponge to clean.
X Use amild cleaning agent, such as acar
shampoo approved by Mercedes-Benz.
X Thoroughly hose down the vehicle with a
gentle jet of water.
X Do not point the water jet directly towards
the air inlet.
X Use plenty of water and rinse out the
sponge frequently.
X Rinse the vehicle with clean water and dry
thoroughly with achamois.
X Do not let the cleaning agent dry on the
paintwork.
When using the vehicle in winter, remove all
traces of road salt deposits carefully and as
soon as possible.
High-pressure cleaninge quipment G
WARNING
Do not use high-pressure cleaners with circu-
lar-jet nozzles (dirt grinders) to clean your
vehicle, in particular the tyres. You could oth-
erwise damage the tyres and cause an acci-
dent.
! Always maintain adistance of at least
30 cm between the vehicle and the high-
pressure cleaner nozzle. Information about
the correct distance is available from the
equipment manufacturer.
Move the high-pressure cleaner nozzle
around when cleaning your vehicle.
Do not aim directly at any of the following:
R tyres
R door gaps, roof gaps, jointse tc.
R electrical components
R battery
R connectors
R lights 302
CareMaintenance and care

Cleaning th
ewindows G
WARNING
Switch off th ewindscree nwipers and remove
the key fro mthe ignition lock before cleaning
the windscreen or the wiper blades. On vehi-
cles with KEYLESS-GO, press the Start/Stop
button repeatedly until all indicator lamps in
the instrument cluster have gone off. The
windscreen wipers could otherwise move and
injure you.
! Do not use dry cloths, abrasive products,
solvents or cleaning agents containing sol-
ventstoc lean the inside of the windows.
Do not touch the insides of the windows
with hard objects, e.g. an ice scraper or
ring. There is otherwise arisk of damaging
the windows.
! Cleant he water drainage channels of the
windscreen and the rear window at regular
intervals. Deposits such as leaves, petals
and pollen may under certain circumstan-
ces prevent water from draining away.T his
can lead to corrosion damage and damage
to electronic components.
X Cleant he inside and outside of the win-
dows with adamp cloth and acleaning
agent that is recommended and approved
by Mercedes-Benz.
Cleaningt he wiper blades G
WARNING
Switch off the windscreen wipers and remove
the key from the ignition lock before cleaning
the windscreen or the wiper blades. On vehi-
cles with KEYLESS-GO, press the Start/Stop
button repeatedly until all indicator lamps in
the instrumentc luster have gone off. The
windscreen wipers could otherwise move and
injure you.
! Do not pull on the wiper blade. Otherwise,
the wiper blade could be damaged.
! Do not clean wiper blades too often and
do not rub them too hard. Otherwise, the graphite coating could be damaged. This
could cause wiper noise.
! Hold the wiper arm securely when folding
back. The windscreen could be damaged if
the wiper arm hits against it suddenly.
X Fold the wiper arms away from the wind-
screen.
X Carefully clean the wiper blades with a
damp cloth.
X Fold the windscreen wipers back again
before switching on the ignition.
Cleaningt he exterior lighting !
Only use cleaning agents or cleaning
cloths that are suitable for plastic lenses.
Unsuitable cleaning agents or cleaning
cloths could scratchord amage the plastic
lenses of the exterior lighting.
X Cleant he plastic lenses of the exterior
lighting using awet sponge and amild
cleaning agent, e.g. Mercedes-Ben zcar
shampoo or cleanin gcloths.
Mirror turn signal !
Only use cleanin gagents or cleaning
cloth sthata re suitable for plastic lenses.
Unsuitable cleanin gagents or cleaning
cloth scould scratch or damag ethe plastic
lenses of th emirror tur nsignals.
X Clean the plastic lenses of the mirror turn
signals in the exterior mirror housing using
aw et sponge and mild cleanin gagent, e.g.
Mercedes-Benz car shampoo or cleaning
cloths.
Cleaning the sensors !
If you clean th esensor swithah igh-pres-
sure cleaner, mak esure that you keep a
distanc eofatl east 30 cm between the
vehicle and th ehigh-pressure cleane rnoz-
zle. Information about the correc tdistance
is available from the equipment manufac-
turer. 304
CareMaintenance and care

The vehicle tool kit contains:
R
Foldable wheel chock
R Fuse allocation chart
R Jack
R Centrin gpin
R One pair of gloves
R Wheel wrench
R Towing eye
Vehicles with acollapsible emergency
spare wheel (AMG vehicles) :
Towin geye
; Onep air of gloves
= Jack
? Folding wheel chock
A Centrin gpin
B Sheet for fault ywheel
C Tyre inflatio ncompressor
D Wheel wrench
E Fuse allocation chart
X Open the boot lid.
X Lift the boot floor upwards (Y page 278).Flat tyre
Preparing the vehicle
Information on changing awheel/fitting
(Y page 336).
Vehicle preparation is not necessary on vehi-
cles with MOExtended tyres. Your vehicle may be equipped with:
R
MOExtended tyres (tyres with run-flat char-
acteristics) (Y page 313)
R aT IREFIT kit (Y page 313)
R an emergenc yspare wheel (only for certain
countries) (Y page 351)
X Stop the vehicle as far away as possible
from traffic on solid, non-slippery and level
ground.
X Switch on the hazard warning lamps.
X Apply the parking brake.
X Bring the front wheels into the straight-
ahead position.
X Shift the transmission to position P.
X Vehicles with AIRMATIC: make sure that
"normal" level is selected (Y page 181).
X Switch off the engine.
X Vehicles without KEYLESS-GO: remove
the key from the ignition lock.
X Vehicles with KEYLESS-GO: open the
driver's door.
The on-board electronics have status 0,
which is the same as the key having been
removed.
X Vehicles with KEYLESS-GO: remove the
Start/Stop button from the ignition lock
(Y page 141).
X All occupant smust get out of the vehicle.
Make sure that they are not endangered as
they do so.
X Make sure that no one is near the danger
area while awheel is being changed. Any-
one who is not directly assisting in the
wheel change should, for example, stand
behind the barrier.
X Get out of the vehicle. Pay attention to traf-
fic conditions when doing so.
X Close the driver's door.
X Place the warning triangle asuitable dis-
tancea way (Y page 310). Observe legal
requirements. 312
Flat tyreBreakdown assistance

Battery aci
discaustic.
Avoid contact with the skin,
eyes or clothing.
Wea rsuitable protective
clothing ,inparticular
gloves, an apro nand aface
mask.
Immediately rins eacid
splashes off with clean
water. Consult adoctor if
necessary. Wear ey
eprotection. Kee
pchildren away. Observ
ethisO wner'sM an-
ual. G
WARNING
For safety reasons ,Mercedes-Benz recom-
mend stha tyou only use batteries which have
been tested and approved for your vehicle by
Mercedes-Benz. These batteries provide
increased impact protection to prevent vehi-
cle occupant sfrom suffering acid burns
should the battery be damaged in the event
of an accident.
To prevent acid burns, observe the following
safety notes when handling batteries:
R do not lean over the battery.
R do not place any metal object sonabattery.
Otherwise, you could cause ashort circuit
and the battery's gas mixture could ignite.
R make sure that you do not create an elec-
trostatic charge, e.g. by wearing synthetic
clothin gorasar esult of friction on fabrics.
Therefore, you should not pull or slide the
battery over carpets or other synthetic
materials. R
never touch the battery first. To discharge
ap ossible electrostatic charge, step out of
the vehicle first and touch the bodywork.
R do not wipe the battery using acloth. The
battery may explode as aresult of electro-
static charge or due to flying sparks. H
Environmental note Batteries contain pollutants.
It is illegal to dispose of them
with the household rubbish.
They must be collected sep-
arately and disposed of in an
environmentally responsible
recycling system. Dispose of batteries in an
environmentally responsible
manner. Take discharged
batteries to
aqualified spe-
cialis tworkshop or to acol-
lection point for used batter-
ies.
! Have the battery checked regularly at a
qualified specialist workshop.
Observe the service intervals in the Service
Booklet or contact aqualified specialist
workshop for more information.
! You should have all work involving the
battery carried out at aqualified specialist
workshop. In th eexcepti onal cas ethatitis
necessar yfor you to disconnect th ebattery
yourself, mak esure that:
R you switch off th eenginea nd remove the
key. On vehicles wit hKEYLESS-GO,
ensure that th eignition is switched off.
Chec kthat all the indicator lamps in the
instrumentc luster are off. Otherwise,
electronic components, such as the
alternator, may be damaged.
R you first remove the negative terminal
clamp and then the positive terminal
clamp. Never swap the terminal clamps. Battery (vehicle)
317Breakdown assistance Z