2016 MERCEDES-BENZ C-CLASS CABRIOLET stop start

Display messages
Possible causes/consequences and
M
MSolutions !
Parking brake inop‐ Parking brake inop‐
erative erative The yellow
!warning lamp lights up. The red !indicator lamp
flashes for about ten seconds after the electric parking brake has been applied or released. It then goes out or remains lit.
The electric parking brake is malfunctioning, e.g. because of over-
voltage or undervoltage.
X Rectify the cause of the overvoltage or undervoltage, e.g. by charg-
ing the battery or restarting the engine.
X Apply or release the electric parking brake.
If the electric parking brake still cannot be applied or released: X Switch off the ignition and switch it back on.
X Apply or release the electric parking brake.
If the electric parking brake still cannot be released: X Consult a qualified specialist workshop.
If the electric parking brake still cannot be applied:
X Consult a qualified specialist workshop. The yellow
!warning lamp lights up and the red !indicator
lamp flashes.
The electric parking brake cannot be applied manually.
X Vehicles with manual transmission: engage first gear.
X Vehicles with automatic transmission: shift the transmission to
position P.
X Consult a qualified specialist workshop. J
Check brake fluid Check brake fluid
level level There is insufficient brake fluid in the brake fluid reservoir.
In addition, the red Jwarning lamp lights up on the instrument
cluster and a warning tone sounds.
G WARNING
Braking efficiency may be impaired.
There is a risk 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.
X Secure the vehicle against rolling away (Y page 159).
X Consult a qualified specialist workshop.
X Do not top up the brake fluid. This does not correct the fault. #
Check Check
brake
brakepad
padwear
wear The brake pads/linings have reached their wear limit.
X Consult a qualified specialist workshop. G
Inoperative Inoperative Vehicles with Audio 20 multimedia system:
Malfunction of one or more main functions of the MB Contact system.
X Consult a qualified specialist workshop. Display
messages
247On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions G
Inoperative Inoperative Vehicles with COMAND Online multimedia system:
Malfunction of one or more main functions of the Mercedes connect
me system.
X Consult a qualified specialist workshop. Collision Preven‐ Collision Preven‐
tion Assist Plus tion Assist Plus
currently unavaila‐ currently unavaila‐
ble ble
See
SeeOwner's
Owner's Man‐
Man‐
ual
ual COLLISION PREVENTION ASSIST PLUS is temporarily inoperative.
Possible causes:
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations or other sources of electromagnetic radiation
R The system is outside the operating temperature range
R The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
disappears.
COLLISION PREVENTION ASSIST PLUS is operational again.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 159).
X Restart the engine. Collision Preven‐ Collision Preven‐
tion Assist Plus tion Assist Plus
inoperative inoperative COLLISION PREVENTION ASSIST PLUS is inoperative due to a mal-
function. Adaptive Brake Assist may also have failed.
X Consult a qualified specialist workshop immediately. PRE-SAFE inopera‐ PRE-SAFE inopera‐
tive See Owner's tive See Owner's
Manual Manual
Important PRE-SAFE
®
functions have failed. All other occupant safety
systems, e.g. airbags, remain available.
X Consult a qualified specialist workshop immediately. PRE-SAFE Functions
PRE-SAFE Functions
currently limited currently limited
See Owner's Manual See Owner's Manual
PRE
‑SAFE ®
PLUS or PRE‑ SAFE®
Brake is temporarily inoperative.
Possible causes:
R The function is impaired due to heavy rain or snow
R The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation
R Mercedes-AMG vehicles: ESP ®
is deactivated
R The system is outside the operating temperature range
R The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
disappears.
PRE ‑SAFE ®
PLUS and PRE ‑SAFE®
Brake are operational again.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 159).
X Restart the engine.
X Mercedes-AMG vehicles: reactivate ESP ®
(Y page 74). 248
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions PRE-SAFE Functions
PRE-SAFE Functions
limited limited
See
SeeOwner's
Owner's
Manual
Manual PRE
‑SAFE ®
PLUS or PRE‑ SAFE®
Brake is unavailable due to a mal-
function. BAS PLUS with Cross-Traffic Assist may also have failed.
X Consult a qualified specialist workshop immediately. Radar
Radar
sensors
sensors dirty
dirty
See Owner's Manual
See Owner's Manual The radar sensor system is malfunctioning.
Possible causes:
R Dirt on sensors
R Heavy rain or snow
R Driving on inter-urban roads without traffic or infrastructure, e.g. in
desert-like areas
At least one driving system or driving safety system is malfunctioning
or is temporarily unavailable:
R PRE-SAFE ®
PLUS
R PRE-SAFE ®
Brake
R COLLISION PREVENTION ASSIST PLUS
R Active Lane Keeping Assist
R Active Blind Spot Assist
R DISTRONIC PLUS with Steering Assist and Stop&Go Pilot
If the front radar system sensor is dirty, Active Blind Spot Assist will
not perform a course-correcting brake application.
Once the cause of the problem is no longer present, the driving sys-
tems and driving safety systems will be available again. The display
message disappears.
If the display message does not disappear:
X Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 159).
X Switch off the engine.
X Clean all sensors (Y page 319).
X Restart the engine.
The display message disappears. 6
Restraint sys. mal‐ Restraint sys. mal‐
function Consult function Consult
workshop workshop The restraint system is malfunctioning. The
6warning lamp also
lights up on the instrument cluster.
G WARNING
The airbags or belt tensioners may either be triggered unintentionally or, in the event of an accident, may not be triggered.
This poses an increased risk of injury!
X Consult a qualified specialist workshop immediately.
Further information about the restraint system (Y page 42). Display
messages
249On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions b
Switch on headlamps Switch on headlamps You are driving without dipped-beam headlamps.
X
Turn the light switch to the Lorà position. Adaptive Highbeam Adaptive Highbeam
Assist Plus cur‐ Assist Plus cur‐
rently unavailable rently unavailable
See Owner's Manual See Owner's Manual Adaptive Highbeam Assist Plus is deactivated and temporarily inop-
erative. 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 again, the
Adaptive Highbeam Assist Plus available again
Adaptive Highbeam Assist Plus available again message is
displayed.
Adaptive Highbeam Assist Plus is operational again. Adaptive Highbeam Adaptive Highbeam
Assist Plus inoper‐ Assist Plus inoper‐
ative ative Adaptive Highbeam Assist Plus is faulty.
X Consult a qualified specialist workshop. Engine
Display messages
Possible causes/consequences and
M
MSolutions +
Top up coolant See Top up coolant 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 when doing so
(Y page 312).
If you have to top up the coolant frequently: X Contact a qualified specialist workshop and have the engine cooling
system checked. ? The fan motor is faulty.
X If the coolant temperature is below 120 †, drive on to the nearest
qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in moun-
tainous terrain and stop-start traffic. 254
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions ?
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 has
overheated can cause any fluids that 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 traffic
conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 159).
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 otherwisebe damaged.
X Pay attention to the coolant temperature gauge.
If the temperature increases again:
X Consult a qualified specialist workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 120 †. #
See Owner's Manual See Owner's Manual The battery is no longer being charged.
A warning tone also sounds.
Possible causes:
R faulty alternator
R torn poly-V-belt
R a malfunction in the electronics
! Do not continue driving. The engine could otherwise overheat.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 159).
X Consult a qualified specialist workshop. Display
messages
255On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions #
Stop vehicle See Stop vehicle See
Owner's Manual Owner's Manual The battery is no longer being charged and the charge status is too
low.
A warning tone also sounds.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 159).
X Observe the instructions in the display #See
See Owner's Owner's Manual
Manual
message.
X Consult a qualified specialist workshop. #
Stop vehicle Leave Stop vehicle Leave
engine running engine running The battery charge status is too low.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving.
X Leave the engine running.
X Wait until the display message disappears before pulling away. #
Start engine See Start engine See
Owner's Manual Owner's Manual The engine is off and the charge status is too low.
X Switch off any electrical consumers that you do not need, such as
the rear window heating and interior lighting.
X Leave the engine running for a few minutes, or drive for an extended
period.
The battery charges. 4
Check Check
eng.
eng.oil
oillev.
lev.
when
when next
nextrefuelling
refuelling The engine oil level has dropped to the minimum level.
A warning tone also sounds.
! Avoid long journeys when there is too little coolant in the cooling
system. Otherwise the engine will be damaged.
X Check the engine oil level when next refuelling, at the latest
(Y page 310).
X If necessary, top up the engine oil (Y page 311).
If you have to top up the engine oil frequently:
X Contact a qualified specialist workshop and have the engine
checked.
Information on approved engine oils can be obtained from a qualified specialist workshop or on the internet at http://bevo.mercedes-
benz.com. 256
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions 4
Add 1 litre engine Add 1 litre engine
oil when next refu‐ oil when next refu‐
elling elling Mercedes-AMG C 63 vehicles:
The engine oil level has dropped to the minimum level.
! Avoid long journeys when there is too little coolant in the cooling
system. Otherwise the engine will be damaged.
X Check the engine oil level when next refuelling, at the latest
(Y page 310).
X If necessary, top up the engine oil (Y page 311).
If you have to top up the engine oil frequently:
X Contact a qualified specialist workshop and have the engine
checked.
Information on approved engine oils can be obtained from a qualified specialist workshop or on the internet at http://bevo.mercedes-
benz.com. 4
Engine oil level Engine oil level
Stop Stop
vehicle
vehicle Switch
Switch
engine off
engine off Mercedes-AMG C 63 vehicles:
The engine oil level is too low. There is a risk of engine damage.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 159).
X Check the engine oil level (Y page 310).
X If necessary, top up the engine oil (Y page 311).8
Reserve fuel level Reserve fuel level The fuel level has dropped into the reserve range.
X Refuel at the nearest filling station. C There is very little fuel in the fuel tank.
X You must refuel at the nearest filling station. ¸
Replace air cleaner Replace air cleaner Vehicles with a diesel engine:
The engine air filter is dirty and must be replaced.
X Consult a qualified specialist workshop. !
Clean the fuel fil‐ Clean the fuel fil‐
ter ter Vehicles with a diesel engine:
There is water in the fuel filter. The water must be drained off.
X Consult a qualified specialist workshop. Refill AdBlue See Refill AdBlue See
Owner’s Manual Owner’s Manual
The AdBlue
®
level has fallen below the reserve range. A warning tone
also sounds.
X Refill AdBlue ®
as soon as possible (Y page 156).Refill AdBlue No Refill AdBlue No
start in ... mi start in ... mi
The AdBlue
®
level is sufficient only for the indicated distance. A warn-
ing tone also sounds.
X Refill AdBlue ®
immediately (Y page 156).
i If you drive the vehicle at speeds greater than 15 km/h, the
Refill
Refill AdBlue
AdBlueNo
Nostart
start in
in...
... mi
mimessage disappears after
approximately one minute. Display
messages
257On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions Refill AdBlue Eng.
Refill AdBlue Eng.
start not possible start not possible
The AdBlue
®
tank is empty. A warning tone also sounds. You can no
longer start the engine.
X Add at least 3.5 l of AdBlue ®
(Y page 156).
X Turn the ignition on for approximately one minute.
The system requires approximately one minute after refilling to
detect the change in the AdBlue ®
level.
X Start the engine. Check AdBlue See Check AdBlue See
Owner’s Manual Owner’s Manual
The AdBlue
®
system is malfunctioning. A warning tone also sounds.
X Consult a qualified specialist workshop. Eng. start not pos‐
Eng. start not pos‐
sible in ... mi sible in ... mi
The AdBlue
®
system is malfunctioning. A warning tone also sounds.
X Consult a qualified specialist workshop immediately. Eng. start not pos‐
Eng. start not pos‐
sible sible
The AdBlue
®
system is malfunctioning. A warning tone also sounds.
You can no longer start the engine.
X Consult a qualified specialist workshop immediately. Driving systems
Display messages
Possible causes/consequences and
M
MSolutions À
ATTENTION ASSIST: ATTENTION ASSIST:
Take a break! Take a break! Based on certain criteria, ATTENTION ASSIST has detected fatigue or
increasing lapses in concentration on the part of the driver. A warning tone also sounds.
X If necessary, take a break.
During long journeys, take regular breaks in good time so that you get enough rest. À
ATTENTION ASSIST ATTENTION ASSIST
inoperative inoperative ATTENTION ASSIST is inoperative.
X Consult a qualified specialist workshop. ¨
Vehicle rising Vehicle rising The vehicle rises to the level you have selected.
¨
Vehicle rising Vehicle rising
Please wait Please wait The vehicle level is too low when the vehicle is stationary. A warning
tone also sounds.
X Do not pull away.
The vehicle level is set when the display message disappears. ¨
Stop vehicle Vehi‐ Stop vehicle Vehi‐
cle too low cle too low You have pulled away while the vehicle level was too low.
AIRMATIC sets the vehicle to the selected level after a short period.
X
Stop the vehicle, paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 159).
X Wait until the display message disappears before pulling away. 258
Display
messagesOn-board computer and displays