2012 MERCEDES-BENZ CLS COUPE lock

Display messages Possible causes/consequences and
M Solutions
T!
÷
inoperative See
Owner'
sManual EB
D( electronic brak eforce distribution), ABS, ESP ®
,B AS ,PRE-
SAFE ®
,t he HOLD function and hill start assist are unavailable due
to am alfunction.
The adaptive brak elights ,BAS PLU Sand PRE-SAFE ®
Brake may
also hav efailed.
In addition ,the ÷ ,å and! warnin glamp sligh tupin
the instrument cluster and awarning ton esounds.
G WARNING
The brake system continues to function normally, but without the
function slisted above. The fron tand rea rwheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Drive on carefully.
X Visit aqualified specialist workshop immediately. J
Release parking
brake You are driving with the parking brake applied.
Awarning tone also
sounds.
X Release th eparking brake. J
Check brake fluid
level Ther
eisi nsufficient brak efluid in the brak efluid reservoir.
In addition, the red Jwarnin glamp light supinthe instrument
cluster and awarnin gtones ounds.
G WARNING
The braking efficiency may be impaired.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible ,paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Secure the vehicle against rollin gaway (Y page 159).
X Consult aqualified specialist workshop.
X Do not top up the brak efluid. This does not correc tthe error. #
Chec
kbrakep ad wear The brak
epads/linings have reached their wear limit.
X Visit aqualified specialist workshop. 234
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
?
Coolan
tStopv ehi‐ cle Switch engine
off The coolan
tistoo hot.
Aw arning tone also sounds.
G WARNING
Never driv ewithano verheate dengine. Drivin gwhen your engine
is overheate dcan caus esom efluids which may have leaked into
the engine compartmen ttocatch fire.
Steam fro manoverheated engine can caus eserious burns, which
can occur just by opening the bonnet.
This pose sarisk of injury.
X Stop the vehicl eimmediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicl eagainst rolling away (Y page159).
X Leave the vehicl eand keep asafe distance from the vehicl euntil
the engine has coole ddown.
X Make sure that the air supply to the engine radiator is not
blocked ,e.g. by frozen slush.
X Do not start the engine again until the display message goes out
and the coolant temperature is under 120 †. The engine may
otherwise be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visi taqualified specialist
workshop immediately.
The reading may rise up to 120 †undernormal driving conditions
if the coolant has been filled correctly. Display messages
241On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
M The bonne
tisopen. Awarning tone also sounds.
G WARNING
The open bonne tmay then bloc kyour view when the vehicle is in
motion.
There is arisk of an accident.
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 Close the bonnet. C At least one door is open.
Awarning tone also sounds.
X Close all doors. _
Rea
rl efts eat backrest not
locked or
Rear right sea
tback‐ res
tn ot locked The backres
tinthe rear is not engaged on the left-hand and/or
right-hand side. Awarning tone also sounds.
X Push th ebackres tback until it engages. _
Front lef
tseat backrest not
locked or
Front right sea
tback‐ res
tn ot locked The driver'
sorfront-pa ssenger seat backres tisnot engaged. A
warning tone also sounds.
X Push the backrest back until it engages. &
inoperative Bat‐
tery low The on-board voltage is too low. The auxiliary heating has switched
itself off or cannot be switched on (Y
page 132).
X Drive for alonger distance.
The battery is being charged. The auxiliary heating is operational
againass oon as the on-board electrical system voltage is suf-
ficient. &
inoperative
Refuel
vehicle There is too little fuel in the fuel tank. The auxiliary heating cannot
be switched on (Y
page 132).
X Refuel at the nearest filling station. Display messages
255On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
&
inoperative See
Owner'
sManual The auxiliar
yheatin ghasatem porar ymalfunction or is faulty.
X Whe nthe vehicle is on alevel surface and the engin ehas cooled
down, make up to four attempts to switch on the auxiliary heat-
ing, waiting several minutes between each attempt
(Y page 132).
X If the auxiliary heating does not switch on, consult aqualified
specialist workshop. Ð
Power
steering mal‐
functio
nSee Own‐ er's Manual The power steering assistanc
eisfaulty.
Aw arning tone also sounds.
G WARNING
You will need to use mor eforce to steer.
Ther eisar iskofana ccident.
X Check whethe ryou are able to apply the extraf orce required.
X If you are able to steer safely: carefully drive on toaqualified
specialist workshop.
X If you are unable to steer safely: do not drive on. Contact the
nearest qualified specialist workshop. Telephone No
service Your vehicle is outside the network provider's transmitter/
receiver range.
X
Wait until the mobile phone operational readiness symbol
appears in the multifunction display. ¥
Top
up washer fluid The washer fluid level in the washer fluid reservoir has dropped
below the minimum.
X
Top up the washer fluid (Y page 299).Key
Display messages Possible causes/consequences and
M Solutions
Â
Key does not
belong to vehicle You have put the wrong key in the ignition lock.
X
Use the correc tkey. Â
Replace key The key needs to be replaced.
X
Visit aqualified specialist workshop. 256
Display messagesOn-board computer and displays

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

Problem Possible causes/consequences and
M Solutions
!
The yellowA
BS warning
lamp is lit while the
engine is running. ABS (Anti-lock Brake System) has been deactivated due to
afault.
For this reason, BAS (Brake Assist), BAS PLUS, ESP ®
(Electronic
Stability Program), PRE-SAFE ®
,P RE-SAFE ®
Brake ,the HOLD func-
tion, hill start assist and the adaptive brake lights are also deac-
tivated, for example.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional displaym essages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop.
If the ABS control unit is faulty, there is also apossibility that other
systems, such as the navigation system or the automatic trans-
mission, will not be available. Warning and indicator lampsint
he instrument cluster
261On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
!
The yellowA
BS warning
lamp is lit while the
engine is running. ABS is temporarily unavailable. Therefore, BAS,B
AS PLUS, ESP®
,
EBD (electronic brake force distribution), PRE-SAFE ®
,
PRE-SAFE ®
Brake, the HOLD function, hill start assist and the
adaptive brake lights, for example, are also deactivated.
Possible causes:
R Self-diagnosis is not yet complete.
R the on-board voltage may be insufficient.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
There is arisk of an accident.
X Carefullyd rive onasuitable stretch of road, making slight steer-
ing movements, at aspeed above 20 km/h.
The functions mentioned above are available again when the
warning lamp goes out.
If the warning lamp is still on:
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. 262
Warning and indicator lampsint
he instrument clusterOn-board computer and displays