2014 MERCEDES-BENZ C-CLASS SALOON Owners Manual

Display messages
Possible causes/consequences and
M
MSolutions 6
Rear centre mal‐ Rear centre mal‐
function Consult function Consult
workshop workshop The rear centre restraint system has malfunctioned. 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 a qualified specialist workshop. 6
Left Left
windowbag
windowbag mal‐
mal‐
function Consult
function Consult
workshop workshoporRight Right
windowbag malfunc‐
windowbag malfunc‐
tion Consult work‐ tion Consult work‐
shop shop There is a malfunction in the left or right windowbag. 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 a qualified specialist workshop. 326
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions Front-passenger
Front-passenger
airbag disabled airbag disabled
See Owner's Manual See Owner's Manual The front-passenger front airbag is disabled during the journey
although:
R an adult
or
R a person larger than a certain size is occupying the front-
passenger seat
If additional forces are applied to the seat, the weight the system
detects may be too low.
G WARNING
The front-passenger front airbag does not deploy during an acci-
dent.
This poses an increased risk of injury. 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 207).
X Switch the ignition off.
X Have the occupant on the front-passenger seat step out of the
vehicle.
X Make sure that the seat is unoccupied, close the front-
passenger door and switch on the ignition.
X Observe the PASSENGER AIRBAG indicator lamps in the centre
console and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the PASSENGER AIR BAG OFF and PASSENGER AIR BAG ON
indicator lamps must light up simultaneously for approx-
imately six seconds.
R the PASSENGER AIRBAG OFF indicator lamp must then light
up and remain lit. If the indicator lamp is on, the automatic
front-passenger front airbag deactivation system has disa-
bled the front-passenger front airbag (Y page 54).
R the display messages Front-passenger
Front-passenger airbag airbagenabled
enabled
See
See Owner's
Owner's Manual
ManualorFront-passenger
Front-passenger airbag
airbag disa‐
disa‐
bled See Owner's Manual
bled See Owner's Manual must not appear in the multi-
function display.
X Wait for a period of at least 60 seconds until the necessary sys-
tem checks have been completed.
X Make sure that the display messages do not appear in the mul-
tifunction display.
If these conditions are met, the front-passenger seat can be occu- pied again. Whether the PASSENGER AIRBAG OFF or ON indicator
lamp remains lit or goes out depends on how the automatic front- Display
messages
327On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions passenger front airbag deactivation system classifies the occu-
pant.
If the conditions are not met, the system is not operating correctly.
X Visit a qualified specialist workshop immediately.
Further information on the automatic front-passenger front airbag deactivation feature (Y page 54).Front-passenger Front-passenger
airbag airbag
enabled
enabled See
See
Owner's Manual
Owner's Manual The front-passenger front airbag is enabled during the journey
although:
R a child, a small adult or an object weighing less than the system
weight threshold is located on the front-passenger seat
or
R the front-passenger seat is not occupied
The system may detect objects or forces that are adding to the
weight applied to the seat.
G WARNING
The airbag may deploy unintentionally.
This poses an increased risk of injury. 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 207).
X Switch the ignition off.
X Open the front-passenger door.
X Remove the child and the child restraint system from the front-
passenger seat.
X Make sure there are no objects applying additional force to the
seat.
The system may otherwise detect the additional force and inter- pret the seat occupant's weight as greater than it actually is.
X Make sure that the seat is unoccupied, close the front-
passenger door and switch on the ignition.
X Observe the PASSENGER AIRBAG indicator lamps in the centre
console and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the PASSENGER AIR BAG OFF and PASSENGER AIR BAG ON
indicator lamps must light up simultaneously for approx-
imately six seconds.
R the PASSENGER AIRBAG OFF indicator lamp must then light
up and remain lit. If the indicator lamp is on, the automatic 328
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions front-passenger front airbag deactivation system has disa-
bled the front-passenger front airbag (Y
page 54).
R the display messages Front-passenger Front-passengerairbag
airbagenabled
enabled
See
See Owner's
Owner's Manual
ManualorFront-passenger
Front-passenger airbag
airbagdisa‐
disa‐
bled See Owner's Manual
bled See Owner's Manual must not appear in the multi-
function display.
X Wait for a period of at least 60 seconds until the necessary sys-
tem checks have been completed.
X Make sure that the display messages do not appear in the mul-
tifunction display.
If these conditions are met, the front-passenger seat can be occu- pied again. Whether the PASSENGER AIRBAG OFF or ON indicator
lamp remains lit or goes out depends on how the automatic front- passenger front airbag deactivation system classifies the occu-
pant.
If the conditions are not met, the system is not operating correctly.
X Visit a qualified specialist workshop immediately.
Further information on the automatic front-passenger front airbag deactivation feature (Y page 54).Lights
i Display messages about LEDs:
This display message will only appear if all the LEDs have failed. Display messages
Possible causes/consequences and
M MSolutions b
Left cornering Left cornering
light light
orRight cor‐
Right cor‐
nering light
nering light The left or right-hand cornering light is faulty.
X Visit a qualified specialist workshop. b
Left dipped beam Left dipped beam
or
Right dipped Right dipped
beam beam The left or right-hand dipped-beam headlamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 142).
or
X Visit a qualified specialist workshop. b
Trailer left tail Trailer left tail
lamp lampor
Trailer
Trailer
right tail lamp right tail lamp The left or right-hand trailer tail lamp is faulty.
X Observe the separate operating instructions provided by the
trailer manufacturer. Display
messages
329On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions b
Trailer left indi‐ Trailer left indi‐
cator catororTrailer
Trailer
right indicator
right indicator The left or right-hand trailer turn signal lamp is faulty.
X Observe the separate operating instructions provided by the
trailer manufacturer. b
Trailer brake lamp Trailer brake lamp The trailer brake lamp is faulty.
X Observe the separate operating instructions provided by the
trailer manufacturer. b
Rear left indica‐ Rear left indica‐
tor tor
orRear right
Rear right
indicator
indicator The rear left-hand or rear right-hand turn signal is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 142).
or
X Visit a qualified specialist workshop. b
Front left indica‐ Front left indica‐
tor tor
orFront right
Front right
indicator
indicator The front left-hand or front right-hand turn signal is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 142).
or
X Visit a qualified specialist workshop. b
Left Left
mirror
mirror indica‐
indica‐
tor
tor orRight mir‐
Right mir‐
ror indicator
ror indicator The turn signal in the left-hand or right-hand exterior mirror is
faulty.
X Visit a qualified specialist workshop. b
Left brake lamp Left brake lamp
or
Right brake lamp
Right brake lamp The left or right-hand brake lamp is faulty.
X Visit a qualified specialist workshop. b
Third brake lamp Third brake lamp The third brake lamp is faulty.
X Visit a qualified specialist workshop. b
Left-hand tail Left-hand tail
lamp/ brake lamp/ brake
lamp lampor
Right-hand
Right-hand
tail lamp/ brake
tail lamp/ brake
lamp lamp The left or right-hand tail lamp/brake lamp is faulty.
X Visit a qualified specialist workshop. 330
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions b
Left tail lamp Left tail lamp
or
Right tail lamp
Right tail lamp The left or right-hand tail lamp is faulty.
X Visit a qualified specialist workshop. b
Left main Left main
beam beamor
Right main
Right main
beam
beam The left or right-hand main-beam headlamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 142).
or
X Visit a qualified specialist workshop. b
Number plate lamp Number plate lamp The left or right-hand licence plate lamp is faulty.
X Visit a qualified specialist workshop. b
Rear fog lamp Rear fog lamp The rear foglamp is faulty.
X Visit a qualified specialist workshop. b
Front Front
left
leftparking
parking
lamp
lamp orFront
Front
right parking lamp
right parking lamp The front left or front right parking lamp is faulty.
X Visit a qualified specialist workshop. b
Reversing light Reversing light The left or right-hand reversing lamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 142).
or
X Visit a qualified specialist workshop. b
Left daytime driv‐ Left daytime driv‐
ing lamp ing lamp
orRight
Right
daytime driving
daytime driving
lamp lamp The left-hand or right-hand daytime driving lamp is faulty.
X Visit a qualified specialist workshop. b
Active Light Sys‐ Active Light Sys‐
tem inoperative tem inoperative The active light function is faulty.
X Visit a qualified specialist workshop. b
Intell. Light Sys‐ Intell. Light Sys‐
tem inoperative tem inoperative The Intelligent Light System is faulty. The lights remain available
without the Intelligent Light System.
X Visit a qualified specialist workshop. Display
messages
331On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions b
Malfunction See Malfunction See
Owner's Manual Owner's Manual The exterior lighting is faulty.
X Visit a qualified specialist workshop. Vehicles with trailer tow hitch: a fuse may have blown.
X Check the fuses (Y page 424).
X If necessary, replace the blown fuse. Observe the warning notes
as you do so.
If the display message continues to be displayed: X Visit a qualified specialist workshop. b
AUTO AUTO
lights
lights inoper‐
inoper‐
ative
ative The light sensor is faulty.
X Visit a qualified specialist workshop. b
Switch off lights 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.Adaptive Highbeam Adaptive Highbeam
Assist Assist
Plus
Plusinoper‐
inoper‐
ative
ative Adaptive Highbeam Assist Plus is faulty.
X Visit a qualified specialist workshop. Adaptive Highbeam
Adaptive Highbeam
Assist Plus cur‐ Assist Plus cur‐
rently rently
unavailable
unavailable
See Owner's Manual
See Owner's Manual Adaptive Highbeam Assist Plus is deactivated and temporarily
inoperative. Possible causes:
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.
If the system detects that the camera is fully operational, display
message Adaptive
Adaptive Highbeam
HighbeamAssist
Assist Plus
Plusavailable
available again
again
is displayed.
Adaptive Highbeam Assist Plus is operational again. 332
Display
messagesOn-board computer and displays

Engine
Display messages
Possible causes/consequences and
M
MSolutions +
Top Top
up
upcoolant
coolant See
See
Owner’s Manual
Owner’s Manual The coolant level is too low.
! Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Top up the coolant, observing the warning notes before doing so
(Y page 393).
X If the coolant needs topping up more often than usual, have the
engine coolant system checked at a qualified specialist work-
shop. ? ? The fan motor is faulty.
X If the coolant temperature is below 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid putting the engine under heavy load as you do so, e.g.
driving in mountainous terrain and stop-start traffic. ?
Coolant Stop vehi‐ Coolant Stop vehi‐
cle Switch engine cle Switch engine
off off The coolant is too hot.
A warning tone also sounds.
G WARNING
Never drive with an overheated engine. Driving when your engine is overheated can cause some fluids which may have leaked into
the engine compartment to catch fire.
In addition, steam from an overheated engine can cause serious
burns, which can occur just by opening the bonnet.
There is a risk of injury.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicle to prevent it from rolling away (Y page 207).
X Wait until the engine has cooled down.
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 below 120 †. The engine may
otherwise be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant level, the coolant temperature may rise to 120 †. Display messages
333On-board computer and displays Z