warning light MERCEDES-BENZ C CLASS 2016 Repair Manual

Display messages
Possible causes/consequences and P Solutions
Radar Sensor s Dirty
See Operator' s Man ‐
ual At least on e of th e followin g drivin g systems or drivin g safet y systems
is temporarily restricted or inoperative: R
PRE-SAF E ®
PLU SR
PRE-SAF E ®
BrakeR
COLLISION PREVENTION ASSIST PLU SR
Active Lan e Keepin g Assis tR
Active Blind Spot Assis tR
DISTRONI C PLU S wit h Steering Assis t and Stop&Go Pilo t
If th e radar sensor system in fron t is dirty, Active Blind Spot Assis t will
no t perfor m a course-correcting brak e application .
Possibl e causes are: R
th e sensor s in th e radiato r trim and/o r in th e bumpers are dirtyR
th e function of th e drivin g system or drivin g safet y system is
impaire d due to heav y rain or snow
A warning tone also sounds.
Whe n th e causes state d abov e no longer apply, th e display message
disappears. Al l drivin g systems or drivin g safet y systems are operative
again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 177).X
Switc h off th e engine.X
Clean th e sensor s in th e followin g location s ( Y
page 339):R
in th e radiato r trimR
in th e fron t bumper R
in th e rear bumper, particularly in th e middle of th e rear bumperX
Restart th e engine.
The display message disappears.
u SRS Malfunction Ser ‐
vic e Required The restrain t system is faulty. The u warning lamp also lights up in
th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.
Fo r further information about th e restrain t system, see ( Y
page 46) .Display messages 26 3
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
u Front Lef t Malfunc‐
tio n Servic e
Required or Front
Right Malfunction
Servic e Required The restrain t system has malfunctioned at th e fron t on th e lef t or right .
The u warning lamp also lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.
u Rea r Lef t Malfunc‐
tio n Servic e
Required or Rea r
Right Malfunction
Servic e Required The rear left-han d or right-hand restrain t system has malfunctioned.
The u warning lamp also lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.
u Rea r Center Malfunc‐
tio n Servic e
Required The rear center restrain t system has malfunctioned. The u warning
lamp also lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.
u Lef t Sid e Curtai n
Airbag Malfunction
Servic e Required or
Right Sid e Curtai n
Airbag Malfunction
Servic e Required There is a malfunction in th e left-han d or right-hand window curtai n air
bag. The u warning lamp also lights up in th e instrumen t cluster.
G WARNIN G
The lef t or right window curtai n air bag may either be triggered unin-
tentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.264
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P SolutionsX
Visit a qualified specialist workshop immediately.
Fo r further information about th e Occupant Classification System, see
( Y
page 54).
Lights Display messages
Possible causes/consequences and P Solutions
I Check Lef t Low Bea m
(Example) The correspondin g bulb is faulty.X
Visit a qualified specialist workshop .
or X
Chec k whether you are permitte d to replace th e bulb yourself
( Y
page 122).
i LE D ligh t sources: th e display message for th e correspondin g
lamp only appear s when all th e LEDs in th e lamp hav e failed.
I Active Headlamps
Inoperative The active ligh t function is faulty.X
Visit a qualified specialist workshop .
I Malfunction See
Operator’ s Manual The exterio r lighting is defective. X
Visit a qualified specialist workshop .
I Aut o Lam p Function
Inoperative The ligh t sensor is faulty. X
Visit a qualified specialist workshop .
I Switch Off Lights You leav e th e vehicl e and th e lights are switched on . A warning tone
also sounds. X
Turn th e ligh t switch to th e X position .
I Switch On Headlamps You are drivin g wit h low-beam headlamp s switched off .X
Turn th e ligh t switch to th e X or X position .Display messages 26 7
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
= Sto p Vehicl e See
Operator' s Manual The battery is no longer bein g charged and th e battery charg e level is
to o low.
A warning tone also sounds. X
Pull ove r and stop th e vehicl e safely and switch off th e engine, pay-
ing attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 177).X
Observ e th e instruction s in th e = See Operator' s Manual
display message .X
Consult a qualified specialist workshop .
= Sto p Vehicl e Leave
Engine Runnin g The battery charg e level is to o low.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions. Do no t continu e drivin g
under any circumstances. X
Leav e th e engin e running.X
Wait until th e display message disappear s before pullin g away.
= Start Engine See
Operator' s Manual The engin e is switched off and th e battery charg e level is to o low.X
Switc h off electrical consumer s that you do no t need, suc h as th e
rear window defroste r and interior lighting .X
Leav e th e engin e runnin g for a few minute s or drive a lon g distance.
The battery is bein g charged.

Hybrid drive system Display messages
Possible causes/consequences and P Solutions
r Vehicle Operational
Switch the Ignition
Off Before Exiting PLUG-IN HYBRID vehicles:
You are exiting the vehicle when it is in a ready-to-drive state. The
READY indicator in the multifunction display is on. A warning tone also
sounds.
If you leave the vehicle: X
Secure the vehicle against rolling away ( Y
page 177).X
Switch off the ignition and remove the SmartKey.
If you do not leave the vehicle: X
Switch off the electrical consumers, e.g. automatic climate control,
seat heating.
Please note the following: The electrical consumers are supplied by
the 12 V battery. If the vehicle is left in a ready-to-drive state for an
extended period, it will switch off once the 12 V battery is almost
empty. It will then only be possible to start the vehicle using a second
battery (jump-starting).
Change the current
drive program
before changing the
operating mode. or
Exit manual drive
program M before
changing the operat‐
ing mode. PLUG-IN HYBRID vehicles:
You have attempted to change the operating mode in the automatic
drive program S (Sport), S+ (Sport Plus) or in the manual drive pro-
gram M . X
Activate drive program C (Comfort) or E (Economy) ( Y
page 229).X
Select the preferred operating mode HYBRID , E-MODE , E-SAVE or
CHARGE ( Y
page 226).
E-MODE Currently
Unavailable PLUG-IN HYBRID vehicles:
The condition of charge of the high-voltage battery has dropped to the
lower limit and the E-MODE operating mode has been switched off.
Driving with the internal combustion engine is activated and the oper-
ating mode switches to the basic HYBRID setting.X
Continue driving using the internal combustion engine.
You can switch to the E-SAVE or CHARGE operating mode as
required ( Y
page 226).
If you select CHARGE , the high-voltage battery is charged.
Once the charge level display for the high-voltage battery has
increased slightly, you can switch to the E-MODE operating mode
again.272
Display messages
On-board computer and displays

General notes The multimedia system section in this manual
describes the basic principles for operation.
More information can be found in the Digital
Operator's Manual.
Important safety notes
G WARNING
If you operate information systems and com-
munication equipment integrated in the vehi-
cle while driving, you will be distracted from
traffic conditions. You could also lose control
of the vehicle. There is a risk of an accident.
Only operate the equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
You must observe the legal requirements for the
country in which you are currently driving when
operating the multimedia system.
The multimedia system calculates the route to
the destination without taking the following into
account, for example: R
traffic lights R
stop and yield signs R
parking or stopping restrictions R
road narrowing R
other road and traffic rules and regulations
The multimedia system may give incorrect nav-
igation recommendations if the actual street/
traffic situation does not correspond with the
digital map's data.
For example: R
a diverted route R
the road layout or the direction of a one-way
street has been changed
For this reason, you must always observe road
and traffic rules and regulations during your
journey. Road and traffic rules and regulations
always have priority over multimedia system
driving recommendations.
Navigation announcements are intended to
direct you while driving without diverting your
attention from the road and driving. Please always use this feature instead of con-
sulting the map display for directions. Looking
at the icons or map display can distract you from
traffic conditions and driving, and increase the
risk of an accident.
This equipment complies with FCC radiation
exposure limits set forth for uncontrolled equip-
ment and meets the FCC radio frequency (RF)
Exposure Guidelines in Supplement C to OET65.
This equipment has very low levels of RF energy
that is deemed to comply without maximum
permissive exposure evaluation (MPE). But it is
desirabl e tha t it should be installed and oper-
a
ted with at least 8i nches (20 cm) and more
between the radiator and a person's body
(excluding extremities: hands, wrists, feet and
legs.)
G WARNING
Modifications to electronic components, their
software as well as wiring can impair their
function and/or the function of other net-
worked components. In particular, systems
relevant to safety could also be affected. As a
result, these may no longer function as inten-
ded and/or jeopardize the operating safety of
the vehicle. There is an increased risk of an
accident and injury.
Never tamper with the wiring as well as elec-
tronic components or their software. You
should have all work to electrical and elec-
tronic equipment carried out at a qualified
specialist workshop.
If you make any changes to the vehicle elec-
tronics, the general operating permit is ren-
dered invalid.
Function restrictions
For safety reasons, some functions are restric-
ted or unavailable while the vehicle is in motion.
You will notice this, for example, because either
you will not be able to select certain menu items
or a message will appear to this effect.298
Function restrictions
Multimedia system

Depending on the vehicle's equipment, the fol-
lowing may be in the stowage space: R
a multimedia connector unit with 2 USB ports
and a SD card slot, e.g. for use with an iPod ®
,
iPhone ®
or MP3 player, see the separate
Operator's Manual R
a small stowage space in the upper front sec-
tion
Stowage compartment in the doors
You can store items such as a rolled-up fluores-
cent jacket (driver's door) and the vehicle docu-
ment wallet (front-passenger door) in stowage
compartment C in the doors.
In doors D you can store bottles with a capacity
of up to 34 fl. oz. (1.0 liter).
Stowage space in the rear
Stowage compartment in the rear seat
armrest
! Do not sit on or support your body weight on
the rear seat armrest when it is folded down,
as you could otherwise damage it.
! Close the cover of the stowage compart-
ment before folding the rear seat armrest
back into the seat backrest. X
To open: fold down the seat armrest. X
Press on the front of release catch C and fold
the cover of the armrest upwards.
Additional stowage space Depending on the equipment, the following
additional stowage areas are available in the
vehicle: R
card and coin holder in the dashboard above
the light switch (not suitable for holding thin
objects such as shopping tokens) R
the open stowage compartment in the center
console R
stowage net in front-passenger footwell R
the map pockets on the back of the driver's
and front-passenger seat R
the parcel nets on the left and right-hand side
in the trunk
Observe the loading guidelines ( Y
page 308)
and the safety notes regarding stowage spaces
( Y
page 308).
Ski and snowboard bag
Important safety notes
G WARNING
The skibag in conjunction with the lashing
straps cannot restrain any objects other than
skis.
Vehicle occupants could be struck in the
event of sudden braking or an accident, for
instance, if you: R
transport other heavy or sharp-edged
objects in the skibag R
do not secure the skibag with the lashing
straps
There is a risk of accident and injury.
Store only skis in the skibag. Always secure
the skibag with the lashing straps so that it
cannot move around.
A maximum of four pairs of skis or two snow-
boards can be transported in the ski and snow-
board bag.310
Sto wag e areas
Stowag e an d features

X
Adjust the head restraints if necessary
( Y
page 107). X
Move the driver's or front-passenger seat
back if necessary.
You should always engage the rear seat backr-
ests if you do not need the through-loading fea-
ture. This will prevent unauthorized access to
the trunk from the vehicle interior.
Locking the center rear seat backrest
In order to prevent the trunk from being
accessed by unauthorized persons, the center
seat backrest can be locked using a catch. The
center seat backrest can only be folded forward
together with the left seat backrest. X
To lock: fold the left and center seat backr-
ests forward. Make sure that the center and
left seat backrests are engaged and joined
together. X
Slide catch C upwards.
The release mechanism of the center seat
backrest is locked. X
To unlock: fold the left and center seat backr-
ests forward. X
Slide catch C downwards.
Securing cargo
Cargo tie-down rings
Observe the following notes on securing loads: R
Observe the loading guidelines ( Y
page 308).R
Secure the load using the cargo tie-down
rings. R
Distribute the load on the cargo tie-down
rings evenly. R
Do not use elastic straps or nets to secure a
load, as these are only intended as an anti-slip
protection for light loads. R
Do not route tie-downs across sharp edges or
corners. R
Pad sharp edges for protection.
Vehicles with the through-loading feature in the
rear bench seat: X
Fold up the cargo tie-down rings next to the
rear seat backrest and put them through the
slots in the carpet.
Bag hook
G WARNING
The bag hooks cannot restrain heavy objects
or items of luggage. Objects or items of lug-
gage could be flung around and thereby hit
vehicle occupants when braking or abruptly
changing directions. There is a risk of injury.
Only hang light objects on the bag hooks.
Never hang hard, sharp-edged or fragile
objects on the bag hooks.
! The bag hook can bear a maximum load of
6.6lbs (3kg) and should not be used to secure
a load.Stowage areas 313
Sto wag e an d features Z

must therefore ensure that you observe the roof
carrier manufacturer's installation instructions.
Vehicles with a panorama roof with power
tilt/sliding panel: the panorama roof with
power tilt/sliding panel cannot be opened if a
roof carrier is installed. The panorama roof with
power tilt/sliding panel can still be raised to
allow ventilation of the vehicle interior.
If the panorama roof with power tilt/sliding
panel makes contact with a roof carrier
approved by Mercedes-Benz, the sunroof will
lower slightly but remain raised at the rear.
Attaching the roof carrier
X
Open covers C carefully in the direction of
the arrow. X
Fold covers C upwards.X
Only secure the roof carrier to the anchorage
points under covers C .X
Observe the manufacturer's installation
instructions.
Features
Cup holder
Important safety notes
G WARNING
If objects in the passenger compartment are
stowed incorrectly, they can slide or be
thrown around and hit vehicle occupants. In
addition, cupholders, open stowage spaces
and mobile phone brackets cannot always
retain all objects they contain. There is a risk
of injury, particularly in the event of sudden
braking or a sudden change in direction. R
Always stow objects so that they cannot be
thrown around in such situations. R
Always make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets. R
Close the lockable stowage spaces before
starting a journey. R
Always stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
! Only use the cup holders for containers of
the right size and which have lids. The drinks
could otherwise spill.
! Do not expose drinks bottles in the cup
holder in the center console to continuous,
strong and direct sunlight. The passenger
compartment in the area of the center con-
sole can otherwise be damaged by the con-
centrated and reflected sunlight.
Observe the loading guidelines ( Y
page 308).
Cup holder in the front-compartment
center console
If you remove the cup holder insert, you can use
the resulting compartment for stowage. X
To open: open the stowage compartment
( Y
page 309). X
To remove: slide catch

Cup holder in the rear seat armrest
! Do not sit on or support your body weight on
the rear seat armrest when it is folded down,
as you could otherwise damage it.
! Close the cup holder before folding the rear
seat armrest up. Otherwise, the cup holder
could be damaged.
X
Fold down the rear seat armrest. X
To open: press the front of cup holder C
or D .
Cup holder C or D extends automatically.X
To fold out: place a container in the cup
holder.
The cup holder folds down automatically. X
To fold in: remove the container.
The cup holder folds in automatically. X
To close: slide cup holder C or D back until
it engages.
Sun visors
Overview
G WARNING
If the mirror cover of the vanity mirror is folded
up when the vehicle is in motion, you could be
blinded by incident light. There is a risk of an
accident.
Always keep the mirror cover folded down
while driving. C
Mirror light D
Bracket