2014 MERCEDES-BENZ CLS warning lights

Display messagesPossible causes/consequences andSolutions

Check Front Left
SidemarkerLampor
Check Front Right
SidemarkerLamp
The leftorright frontside markerlamp is defective.
XVisitaqualified specialist workshop.

Check RearLeft
SidemarkerLampor
Check RearRight
SidemarkerLamp
The rear leftorright side marker lamp is defective.
XVisitaqualified specialist workshop.

CheckLeftDaytime
Running Lightor
CheckRight
Daytime Running
Light
The left-handorright-handdaytime running lamp is faulty.
XVisitaqualified specialist workshop.

Active Light
System Inoperative
The active light function is defective.
XVisitaqualified specialist workshop.

Malfunction See
Operator's Manual
The exterior lighting is defective.
XVisitaqualified specialist workshop.

AutoLampFunction
Inoperative
The light sensor is defective.
XVisitaqualified specialist workshop.

Switch Off Lights
The lightsare still switched on when you leave the vehicle. A
warningtonealso sounds.
XTurn the light switchto\r.
Display messages247
On-board computer and displays
Z

Display messagesPossible causes/consequences andSolutions

VehicleRising
Your vehicleisadjustingtothelevel you haveselected.

VehicleRising
Please Wait
The vehiclelevel is toolow when thevehicleisstationary. A
warningtonealso sounds.
XDo notpull away.
The vehiclelevelisset when thedisplay message disappears.

StopVehicle
VehicleToo Low
You have pulled away while thevehiclelevelisstill toolow.
AIRMATIC setsthevehicletotheselected levelafterashort
period.
XPull overand stop the vehiclesafelyassoonaspossible,paying
attention to road and traffic conditions.
XSecure the vehicle against rolling away(Ypage 167).
XWait until the displaymessage disappears before pulling away.
AIRMATIC is defective.Awarning tone also sounds.
XDo notdriveatspeeds above50mph (80 km/h).
XMakeonlyslightsteering movements. Otherwise, the front
fender or the tires could be damagedifthe steering movement
is too large.
XListenfor scraping sounds.
XPull over and stop the vehicle safely, paying attention to road
and traffic conditions, and selectahigher vehicle level.
Depending on the malfunction, it may be possible to raise the
vehicle.
XVisitaqualified specialist workshop.

Malfunction
The AIRMATICfunction is restricted. The vehicle's handling
characteristics may be affected.
XDo not drive at speeds above 50 mph (80 km/h).
XVisitaqualified specialist workshop.

Off
The HOLD function is deactivated. The vehicle is skidding.
Awarning tone also sounds.
XReactivatetheHOLD function later(Ypage 186).
Radar Sensors
Deactivated See
Operator'sManual
The radar sensor system is deactivated.
XSwitch on theradar sensor system (Ypage 232).
252Display messages
On-boar dc omputer and displays

Safety
Seat belts
ProblemPossible causes/consequences andSolutions

After startingthe
engine, the red seat
belt warning lamp lights
up for6seconds.
The seat belt warning lamp reminds the driver and frontpassenger
to fasten their seat belts.
XFastenyour seat belt (Ypage 56).

After starting the
engine, the red seat
belt warning lamp lights
up. In addition, a
warning tonesounds
for up to six seconds.
The driver's seat belt is not fastened.
XFasten your seat belt (Ypage 56).
The warning toneceases.

The red seat belt
warning 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.
XFasten your seat belt (Ypage 56).
The warning lamp goes out.
There are objectsonthe front-passenger seat.
XRemove the objectsfrom the front-passenger seat and stow
them inasecure place.
The warning lamp goes out.

The red seat belt
warning lamp flashes
and an intermittent
audible warning
sounds.
The driver or front passenger has not fastened their seat belt. You
are driving faster than 15 mph (25 km/h) or have briefly driven
faster than 15 mph (25 km/h).
XFasten your seat belt (Ypage 56).
The warning lamp goes out and the intermittentwarning tone
ceases.
Thereare objectsonthefront-passenger seat.You are driving
faster than 15 mph (25 km/h) or have briefly driven faster than
15 mph (25 km/h).
XRemove the objectsfrom the front-passenger seat and stow
them inasecure place.
The warning lamp goes out and the intermittentwarning tone
ceases.
Indicator and warning lamps in theinstrumentcluster265
On-boar dc omputer and displays
Z

Engine
ProblemPossible causes/consequences andSolutions
\n
The yellow Check
Enginewarning lamp
lightsupwhile the
engineisrunning.
Theremay beamalfunction, for example:
Rin theenginemanagement
Rin thefuel injection system
Rin theexhaust system
Rin theignition system
Rin thefuel system
The emission limit values may be exceeded and theenginemay
be runninginemergencymode.
XHavethevehicle checked as soon as possible ataqualified
specialist workshop.
iIn somestates, you must immediately visitaqualified
specialist workshopassoon as theyellow CheckEngine warning
lamp lights up.This is due to the legal requirements in effect in
these states. If in doubt, check whether such legal regulations
apply in the state in which you are currently driving.

The yellow reserve fuel
warning lamp lights up
while the engine is
running.
The fuel level has dropped into the reserve range.
XRefuel at the nearest gas station.

The yellow reserve fuel
warning lamp flashes
while the vehicle is in
motion.
In addition, the\n
Check Enginewarning
lamp may light up.
The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
XCheck that the fuel filler cap is correctly closed.
XIf the fuel filler cap is not correctly closed:close the fuel filler
cap.
XIf the fuel filler cap is closed:visitaqualified specialist
workshop.

The red coolant
warning lamp lights up
while the engine is
running and the coolant
temperature gauge is
at the start of the scale.
The temperature sensor for the coolant temperature gauge is
defective.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
XPull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 167).
XConsultaqualified specialist workshop.
Indicator and warning lampsinthe instrument cluster273
On-board computer and displays
Z

ProblemPossible causes/consequences andSolutions
XLeave the vehicle and keepasafe distance from the vehicle until
the engine has cooled down.
XCheck the coolant level and add coolant, observing the warning
notes (Ypage 308).
XIf you need to add coolant more often than usual, have the
engine coolant system checked.
XMake sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
XAt coolant temperatures under 248‡(120 †), drive to the next
qualified specialist workshop.
XAvoid subjecting the engine to heavy loads, e.g. driving in
mountainousterrain, and stop-and-go traffic.
Driving systems
ProblemPossible causes/consequencesandSolutions

The red distance
warning lamp lights up
while the vehicle is in
motion.
The distance to the vehicle in front is too smallfor the speed
selected.
XIncrease the distance.

The red distance
warning lamp lights up
while the vehicle is in
motion.Awarning tone
also sounds.
You are approachingavehicle orastationary obstacle in your line
of travel at too highaspeed.
XBe prepared to brake immediately.
XPay careful attention to the traffic situation. You may have to
brake or take evasive action.
Further information on PRE-SAFE®Brake (Ypage 72).
Indicator and warning lampsinthe instrument cluster275
On-board computer and displays
Z

Example: current tire pressure display
Important safety notes
GWARNING
Each tire,including the spare (ifprovided),
should be checked at least once every two
weeks when cold and inflated to the pressure
recommended by the vehiclemanufacturer
on the Tire and Loading Information placard
on the driver'sdoor B-pillar or the tire
pressure label on the inside of the fuel filler
flap.Ifyour vehicle has tires ofadifferent size
than the size indicated on the Tire and Loading
Information placard or, if available, the tire
pressure label, you should determinethe
proper tire pressure for those tires.
As an added safety feature, your vehicle has
been equipped withatire pressure monitoring
system (TPMS) that illuminatesalow tire
pressure telltale when one or more of your
tires are significantly underinflated.
Accordingly, when the low tire pressure
telltale lights up, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Drivingona
significantly underinflated tire causes the tire
to overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that
the TPMS is notasubstitute for proper tire
maintenance, and it is the driver's
responsibility to maintain correcttire
pressure, even if underinflation has not
reached the level to trigger illumination of the
TPMS low tire pressure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the
system detectsamalfunction, the warning
lamp will flash for approximatelyaminute and
then remain continuously illuminated. This
sequence will be repeated every time the
vehicle is started as long as the malfunction
exists. When the malfunction indicator is
illuminated, the system may not be able to
detect or signal low tire pressure as intended.
TPMS malfunctions may occur foravariety of
reasons, including the installation of
incompatible replacement or alternate tires
or wheels on the vehicle that prevent the
TPMS from functioning properly. Always
check the TPMS malfunction telltale after
replacing one or more tires or wheels on your
vehicle to ensure that the replacement or
alternate Tires and wheels allow the TPMS to
continue to function properly.
It is the driver's responsibility to set the tire
pressure to that recommended for cold tires
which is suitable for the operating situation
(Ypage 338). Note that the correcttire
pressure for the current operating situation
must first be taught-in to the tire pressure
monitor. If there isasubstantial loss of
pressure, the warning threshold for the
warning message is aligned to the reference
values taught-in.Restart the tire pressure
monitor after adjustingthe pressure of the
cold tires (Ypage 345). The current
pressures are saved as new reference values.
Asaresult,awarning message will appear if
the tire pressure drops significantly.
The tire pressure monitor does not warn you
of an incorrectly set tire pressure. Observe
the notes on the recommended tire pressure
(Ypage 338).
The tire pressure monitor is not able to warn
you ofasudden loss of pressure, e.g. if the
tire is penetrated byaforeign object. In the
event ofasudden loss of pressure, bring the
vehicle toahalt by brakingcarefully. Avoid
sudden steering movements
Check343
Wheels and tires
Z

The tire pressure monitor hasayellow
warning lamp in the instrument cluster for
indicatingapressure loss or malfunction.
Whether the warning lamp flashes or lights up
indicates whetheratire pressure is too low or
the tire pressure monitor is malfunctioning:
Rif the warning lamp is lit continuously, the
tire pressure on one or more tires is
significantly too low. The tire pressure
monitor is not malfunctioning.
Rif the warning lamp flashes for around a
minute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
If the tire pressure monitor is malfunctioning,
it may take more than ten minutes for the tire
pressure warning lamp to inform you of the
malfunction by flashing for approximately one
minute and then remaining lit. When the
malfunction has been rectified, the tire
pressure warning lamp goes out afterafew
minutes of driving.
The tire pressure values indicated by the on-
board computer may differ from those
measured atagas station withapressure
gauge. The tire pressures shown by the on-
board computer refer to those measured at
sea level. At high altitudes, the tire pressure
values indicated byapressure gauge are
higher than those shown by the on-board
computer.Inthis case, do not reduce the tire
pressures.
The operation of the tire pressure monitor can
be affected by interference from radio
transmitting equipment (e.g. radio
headphones, two-way radios) that may be
being operated in or near the vehicle.
Checking the tire pressure
electronically
XMake sure that the SmartKey is in position
2(Ypage 147) in the ignition lock .
XPress the\norbutton on the
steering wheel to select theServ.menu.
XPress theorbutton to select
Tire Pressure.
XPress thebutton.
The current tire pressure of each tire is
shown in the multifunction display.
If the vehicle was parked for longer than
20 minutes,theTirepressureswillbe
displayed after drivingafew
minutesmessage is shown.
Afterateach-in process, the tire pressure
monitor automatically detects new wheels or
new sensors. As long asaclear allocation of
the tire pressure value to the individual
wheels is not possible, theTire Pressure
Monitor Activedisplaymessage is shown
instead of the tire pressure display. The tire
pressures are already being monitored.
iIf an emergency spare wheel is mounted,
the system may continue to show the tire
pressure of the wheel that has been
removed forafew minutes. If this occurs,
note that the value displayed for the
position where the spare wheel is mounted
is not the same as the current tire pressure
of the emergency spare wheel.
Tire pressuremonitor warning
messages
If the tire pressure monitor detectsapressure
loss in one or more tires,awarning message
is shown in the multifunction displayand the
yellow tire pressure monitor warning lamp
comes on.
RIf theCorrect Tire Pressuremessage
appears in the multifunction display, the
tire pressure in at least one tire is too low
and must be corrected at the next
opportunity.
RIf theCheck Tire Pressuremessage
appears in the multifunction display, the
tire pressure in one or more tires has
dropped significantly and the tires must be
checked.
RIf theTire Malfunctionappears in the
multifunction display, the tire pressure in
344Check
Wheels and tires