2011 MERCEDES-BENZ CLS COUPE Owners Manual

Display messages Possible causes/consequences and
M Solutions
b
Front left indica‐
tor
or
Front
right indica‐
tor The front left-hand or front right-hand turn signal is faulty.
X
Visit a qualified specialist workshop. b
Left
mirror indica‐
tor
or
Right mirror indi‐
cator The turn signal in the left-hand and/or right-hand exterior mirror
is faulty.
X
Visit a qualified specialist workshop. b
Third brake lamp The third brake lamp is faulty.
X
Visit a qualified specialist workshop. b
Left-hand tail
lamp/brake lamp
or
Right-hand tail
lamp/brake lamp The lef
torright-hand tail lamp/brake lamp is faulty.
X Visit a qualified specialist workshop. b
Left main beam
or
Right main beam The left or right-hand high beam is faulty.
X
Visit a qualified specialist workshop. b
Rear left fog lamp
or
Rear
right fog lamp The rear foglamp is faulty.
X
Visit a qualified specialist workshop. b
Front
left parking
lamp
or
Front right park‐
ing lamp The front left or front right parking lamp is faulty.
X
Visit a qualified specialist workshop. 222
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
b
Left revers. lamp
or
Right revers. lamp The lef
torright-hand reversing lamp is faulty.
X Replace the bulb (Y page 104).
or
X Visit a qualified specialist workshop. b
Left daytime driv‐
ing lamp
or
Right
daytime driv‐
ing lamp The left or right-hand daytime driving lamp is defective.
X
Visit a qualified 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 a qualified specialist workshop. b
Malfunction See
Owner's Manual The exterior lighting is faulty.
X
Visit a qualified specialist workshop. b
AUTO
lights inoper‐
ative The light sensor is faulty.
X
Visit a qualified 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 c.Adaptive Main-beam
Assist inoperative Adaptive Highbeam Assist is faulty.
X
Visit a qualified specialist workshop. Adaptive Main-beam
Assist currently
unavailable See
Owner's Manual Adaptive Highbeam Assist is deactivated and temporarily inoper-
ative if:
R
the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
X Clean the windscreen.
Adaptive Highbeam Assist is available again if:
R the dirt (e.g .slush) drops away while the vehicle is in motion.
R the system detects that the camera is fully operational again.
The Adaptive Main-beam Assist available again message
is displayed. Display messages
223On-board computer and displays Z

Engine
Display messages Possible causes/consequences and
M Solutions
+
Top
up coolant See
Owner's Manual The coolant level is too low.
X
Top up the coolant, observing the warning notes before doing
so (Y page 268).
X If the coolant needs topping up more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop. ?
Coolant Stop vehi‐
cle Switch engine
off The coolant is too hot.
X
Pull ove rand stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Make sure tha tthe air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Wait until the display message disappears before restartingt he
engine. Otherwise, there is a risk of engine damage.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately. The poly-V-belt may have torn.
X
Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! do not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X Wait until the display message disappears before restartingt he
engine. Otherwise, there is a risk of engine damage.
X Pay attention to the coolant temperature display.
X Visit a qualified specialist workshop. ? The fan motor is faulty.
X
If the coolant temperature is less than 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-start driving. 224
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
# The battery is no
tbeing charged.
Possible causes are:
R a faulty alternator
R a torn poly-V-belt
R a malfunction in the electronics
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! do not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X Visit a qualified specialist workshop. 4
Check eng. oil
lev. when next
refuelling The engine oil level has dropped to a critical level.
Aw
arning tone also sounds.
X Chec kthe oil level (Y page 267).
X If necessary, top up the engine oil (Y page 268).
X Have the engine checked for leaks if the engine oil needs top-
ping up more often than usual. 8
Reserve fuel level The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated when the fuel level
drops into the reserve range.
X
Refuel at the nearest filling station. C There is only a very small amount of fuel in the fuel tank.
The auxiliary heating cannot be operated.
X
Refuel at the nearest filling station without fail. ¸
Replace
air cleaner Vehicles with a diesel engine: the engine air filter is dirty and must
be replaced.
X
Visit a qualified specialist workshop. !
Clean
the fuel fil‐
ter Vehicles with a diesel engine: there is water in the fuel filter. The
water must be drained off.
X
Visit a qualified specialist workshop. Display messages
225On-board computer and displays Z

Driving systems
Display messages Possible causes/consequences and
M Solutions
À
Attention Assist:
Drowsiness detec‐
ted Based on specific criteria, ATTENTION ASSIST has determined that
the driver is tired or paying less attention
.Awarning tone also
sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good time so you get
enough rest. À
Attention Assist
inoperative ATTENTION ASSIST has failed.
X
Visi taqualified specialist workshop. ¨
Vehicle rising Your vehicle is adjusting to the level you have selected.
¨
Vehicle rising
Please wait The vehicle level is too low when the vehicle is stationary.
Awarn-
ing tone also sounds.
X Do no tpull away.
The vehicle level is set when the display message disappears. ¨
Stop vehicle Vehi‐
cle too low You have pulled away while the vehicle level is still too low.
AIRMATIC sets the vehicle to the selected level after a short
period.
X
Pull ove rand stop the vehicle safely as soo nas possible, paying
attention to road and traffic conditions.
X Apply the parking brake.
X Wait until the display message disappears before pulling away. G
Risk of accident
AIRMATIC is faulty. Awarning tone also sounds.
X Do not exceed a maximum speed of 80 km/h.
X Make only sligh tsteering movements. Otherwise, the front wing
or the tyres could be damaged if the steering movement is too
large.
X Liste nfor scraping sounds.
X Pull over and stop the vehicle safely, paying attention to road
and traffic conditions, and select a higher vehicle level.
Depending on the malfunction, it may be possible to raise the
vehicle.
X Visit a qualified specialist workshop. 226
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
¨
Malfunction G
Risk of accident
The AIRMATIC function is restricted. The vehicle's handling char-
acteristics may be affected.
X Do not exceed a maximum speed of 80 km/h.
X Visit a qualified specialist workshop. Speed Limit Assist
currently unavail‐
able See Owner's
Manual Speed Limit Assis
tis deactivated and temporarily inoperative if:
R the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
Speed Limit Assist is operational againa nd the display message
disappears if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects tha tthe camera is fully operational again.
If the display message continues to be displayed:
X Cleant he windscreen. Speed Limit Assist:
Unavailable in
this country Speed Limit Assist is only available in certain countries.
X
Drive on.
Speed Limit Assist is available again as soon as you drive into a
country in which its use is approved. Speed Limit Assist
inoperative Speed Limit Assist is faulty.
X
Visit a qualified specialist workshop. HOLD
Off The HOLD function is deactivated. The vehicle is skidding.
Aw
arning tone also sounds.
X Reactivate the HOLD function later (Y page 165).Radar sensor
deactivated See
Owner's Manual The radar sensor system is deactivated.
X Chec kwhether or not the radar sensor system may be activated
(Y page 327).
X Switch on the radar sensor system (Y page 210). Display messages
227On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
Radar sensor
deactivated autom.
See Owner's Manual Vehicles with a navigation system: the vehicle is close to a radio
telescope facility and is therefore prohibited from transmitting any
rada
rsignals .The radar sensor system has switched off automat-
ically.
DISTRONIC PLUS (Y page 154) is switched off automatically if it
is activated. Awarning tone also sounds.
If Blind Spot Assist (Y page 183) or Active Blind Spot Assist
(Y page 186) are activated, they are switched off automatically.
The yellow 9indicator lamps also light up in the exterior mir-
rors.
BAS PLUS (Brake Assist PLUS) (Y page 57) and the
PRE-SAFE ®
Brake (Y page 61) are also no tavailable.
X Drive on.
These functions are available again as soon as the vehicle is far
enough away from the radio telescope facility (Y page 327).Lane Keeping
Assist currently
unavailable. see
Owner's Manual
or
Active Lane Keep‐
ing Assist cur‐
rently unavailable
see Owner's Manual Lane Keeping Assist or Active Lane Keeping Assist is deactivated
and temporarily inoperative if:
R
the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
R there are no lane markings for a longer period.
R the lane markings are worn, dark or covered, for example by dirt
or snow.
Lane Keeping Assist or Active Lane Keeping Assist is operational
again and the display message disappears if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects that the camera is fully operational again.
If the display message continues to be displayed:
X Clean the windscreen. Lane Keeping
Assist inoperative
or
Active Lane Keep‐
ing Assist inoper‐
ative Lane Keeping Assist or Active Lane Keeping Assist is faulty.
X
Visi taqualified specialist workshop. 228
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
Blind Spot Assist
currently unavail‐
able See Owner's
Manual
or
Active Blind Spot
Assist currently
unavailable See
Owner's Manual Blind Spot Assis
torActive Blind Spot Assist is temporarily inop-
erative if:
R the sensors are dirty.
R its function is impaired due to heavy rai norsnow.
R the rada rsensor system is outside the operating temperature
range.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
The yellow 9indicator lamps also light up in the exterior mir-
rors.
Blind Spot Assist or Active Blind Spot Assist is operational again
and the display message disappears if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects that the sensors are fully available again.
R the radar sensor system is back within the operatin gtempera-
ture range.
If the display message continues to be displayed:
X Clean the sensors (Y page 274).
X Restart the engine. Blind Spot Assist
inoperative
or
Active Blind Spot
Assist inoperative Blind Spot Assist or Active Blind Spot Assist is faulty.
The yellow
9indicator lamps also light up in the exterior mir-
rors.
X Visit a qualified specialist workshop. Park Assist
cancelled The driver's door is open and the driver's seat belt has not been
fastened.
X Repeat the parking process with the seat belt fastened and the
driver's door closed. You have inadvertently touched the multifunction steering wheel
while steering intervention was active.
The vehicle has started to skid and ESP
®
has intervened.
X Use Active Park Assist again later (Y page 173). Display messages
229On-board computer and displays Z