2012 MERCEDES-BENZ CLS COUPE warning lights

Display messages Possible causes/consequences and
M Solutions
The brak
esystem continues to function normally, but without the
function slisted above. The wheels could therefore loc kifyou
brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergenc ybraking 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. ÷
inoperative See
Owner's Manual ESP
®
,B AS, PRE-SAFE ®
,t he HOLD functio nand hill start assist are
unavailable du etoamalfunction.
The adaptive brake lights ,BAS PLU Sand PRE-SAFE ®
Brake may
also have failed.
In addition, the ÷andå warning lamps light up in the
instrument cluster.
The self-diagnosi sfun ctio nm ay no tbec omplete, for example.
ATTENTION ASSISTisd eactivated.
G WARNING
The brake system continues to function normally, but without the
function slisted above.
The brakin gdistanc einane mergency brakin gsituation can thus
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an acciden tincreases.
X Carefully drive on asuitabl estretch of road, making slight steer-
ing movements at aspeed above 20 km/h.
If the display message disappears, the functions mentioned
above ar eavailable again.
If the display message continue stobedisplayed:
X Driv eonc arefully.
X Visi taq ualified specialist workshop. Display messages
233On-boardcomputer and displays Z

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
ý If th
esymbol appears in th emultifunction display, aseat belt
tongue has not been inserted in arear seat belt buckle.
G WARNING
As eat belt which is not worn correctly, or which has not been
engaged in the seat belt buckle correctly, cannot provide the
intended level of protection.
This poses an increased risk of injury.
X If necessary, ask the occupants in the rear to fasten their seat
belts (Y page 49).
For further information on the status indicator for the rear seat
belts, (Y page 51). 6
Restraint syst.
malfunction Con‐
sult workshop There is
amalfunction in the SRS (Supplemental Restraint Sys-
tem). The 6warning lamp also lights up in the instrument clus-
ter.
G WARNING
The airbags or belt tensioners may either be triggered uninten-
tionally or, in the event of an accident, may not be triggered.
This poses an increased risk of injury.
X Visit aqualified specialist workshop.
For further information about the Supplemental Restraint System,
see (Y page 41). 6
Front
left malfunc‐
tion Consult work‐
shop orFront right
malfunction Con‐
sult workshop SRS has malfunctioned at the fron
tonthe left or right. The 6
warning lamp also lights up in the instrument cluster.
G WARNING
The airbags or belt tensioners may either be triggered uninten-
tionally or, in the event of an accident, may not be triggered.
This poses an increased risk of injury.
X Visit aqualified specialist workshop. 236
Display messagesOn-boar
dcomputer and displays

Display messages Possible causes/consequences and
M Solutions
6
Rea
rl eftm alfunc‐ tio
nC onsul twork‐ shop or
Rea rr ight malfunction Con‐
sul
tw orkshop G
WARNING
The airbags or belt tensioners may either be triggered uninten-
tionally or, in th eevent of an accident, may no tbetriggered.
This poses an increased risk of injury.
SRS has malfunctioned at the rear on the left or right. The 6
warning lamp also lights up in the instrument cluster.
X Visit aqualified specialist workshop. 6
Left
windowbag mal‐
functio
nConsult workshop or
Right windowbag malfunc‐
tion Consult work‐
shop There is
amalfunction in the left-hand and/or right-hand window-
bag.
The 6 warning lamp also lights up in the instrument cluster.
G WARNING
The left or right windowbag may either be triggered unintentionally
or, in the event of an accident, may not be triggered.
This poses an increased risk of injury.
X Visit aqualified specialist workshop. Lights
i Display messages about LEDs:
This display message will only appear if all LEDsh ave failed.Display messages Possible causes/consequences and
M Solutions
b
Left cornering
light or
Right cor‐ nering light The left or right-hand cornering light is faulty.
X
Check whether you are permitted to replace the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Left dipped beam
or
Right dipped beam The left or right-hand dipped-beam headlamp is faulty.
X
Check whether you are permitted to change the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. Display messages
237On-boardcomputer and displays Z

Display messages Possible causes/consequences and
M Solutions
b
Rea
rf og lamp The rear foglam
pisfaulty.
X Chec kwhether you are permitted to change the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Front
left parking
lamp or
Front right parking lamp The front left or front right parking lamp is faulty.
X
Check whether you are permitted to change the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Left revers. lamp
or
Right revers. lamp The left or right-hand reversing lamp is faulty.
X
Check whether you are permitted to change the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Left daytime driv‐
ing lamp or
Right daytime driving
lamp The left-hand or right-hand daytime driving lamp is faulty.
X
Check whether you are permitted to replace the bulb yourself
(Y page 120).
or
X Visit aqualified specialist workshop. b
Intell. Light Sys‐
tem inoperative The Intelligent Light System is faulty. The lights remain available
without the Intelligent Light System.
X
Visit aqualified specialist workshop. b
Malfunction See
Owner's Manual The exterior lighting is faulty.
X
Visit aqualified specialist workshop. b
AUTO
lights inoper‐
ative The light sensor is faulty.
X
Visit aqualified specialist workshop. b
Switch off lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to Ã. Display messages
239On-board computer and displays Z

Safety
Seat belts Problem Possible causes/consequences and
M Solutions
ü
Only for certain coun-
tries: the red seat belt
warning lamp lights up
for six seconds after
the engine starts.
The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X
Fasten your seat belt (Y page 49).ü
Only for certain coun-
tries: the red seat belt
warning lamp lights up
after the engine starts.
In addition,
awarning
tone sounds for up to
six seconds. The driver's seat belt is not fastened.
X
Fasten your seat belt (Y page 49).
The warning tone ceases. ü
The red seat belt warn-
ing lamp lights up after
the engine starts, as
soon as the driver's or
the front-passenger
door is closed.
The driver or front passenger has not fastened their seat belt.
X
Fasten your seat belt (Y page 49).
The warning lamp goes out. There are objectsont
he front-passenger seat.
X Remove the objectsf rom the front-passenger seat and stow
them in asecure place.
The warning lamp goes out. ü
The red seat belt warn-
ing lamp flashes and an
intermittenta
udible
warning sounds. The driver or passenger has no
tfastened their seat belt .Atthe
same time, the car is being driven faster than 25 km/h or has been
briefly driven faster than 25 km/h.
X Fasten your seat belt (Y page 49).
The warning lamp goes out and the intermittent warning tone
ceases. There are objectsont
he front-passenger seat. At the same time,
you are driving faster than 25 km/h or have briefly driven faster
than 25 km/h.
X Remove the objectsf rom the front-passenger seat and stow
them in asecure place.
The warning lamp goes out and the intermittent warning tone
ceases. Warning and indicator lampsint
he instrument cluster
259On-board computer and displays Z

Safety systems
Problem Possible causes/consequences and
M Solutions
J
The yellow brake sys-
tem warning lamp
lights up while the
engine is running.
G
WARNING
The brake system is malfunctioning and the braking characteris-
tics may be affected.
There is arisk of an accident.
X If the multifunction display shows adisplay message, please
observe this.
X Drive on carefully.
X Visit aqualified specialist workshop. J
The red brake system
warning lamp comes on
while the engine is run-
ning.
Awarning tone
also sounds. G
WARNING
The brake boosting effect is malfunctioning and the braking char-
acteristic smay be affected.
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 rolling away (Y page 159).
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. J
The red brake system
warning lamp comes on
while the engine is run-
ning.
Awarning tone
also sounds. There is insufficient brake fluid in the brake fluid reservoir.
G WARNING
The braking efficienc ymay 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 rolling away (Y page 159).
X Do not top up the brake fluid. Topping up will not rectify the
fault.
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. 260
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