ECU MERCEDES-BENZ S-CLASS COUPE 2014 Workshop Manual

Safety systems
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions J
N
The yellow brake system warning lamp lights up while the engine is running.
G WARNING
The brake system is malfunctioning and the braking characteristics may be
affected.
There is a risk of an accident. X If the multifunction display shows a display message, please observe this.
X Drive on carefully.
X Visit a qualified specialist workshop. J
N
The red brake system warning lamp is lit while the engine is running. A
warning tone also sounds.
G WARNING
The brake boosting effect is malfunctioning and the braking characteristics
may be affected.
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 under any circumstan-
ces.
X Secure the vehicle to prevent it from rolling away (Y page 178).
X Consult a qualified specialist workshop.
X Observe the additional display messages in the multifunction display. J
N
The red brake system warning lamp is lit while the engine is running. A
warning tone also sounds.
There is insufficient brake fluid in the brake fluid reservoir.
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 under any circumstan-
ces.
X Secure the vehicle against rolling away (Y page 178).
X Do not top up the brake fluid. Topping up will not rectify the fault.
X Consult a qualified specialist workshop.
X Observe the additional display messages in the multifunction display. Warning and indicator lamps in the instrument cluster
301On-board computer and displays Z

Engine
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ;
N
The yellow engine diagnostics warning lamp lights up while the engine is
running.
There may be a fault, for example:
R in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignition system
R in the fuel system
The emission limit values may be exceeded and the engine may be running in emergency mode.
X Have the vehicle checked as soon as possible at a qualified specialist work-
shop. 8
N
The yellow reserve fuel warning lamp is on while the engine is running.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops into the reserve range.
X Refuel at the nearest filling station. ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge is at the start of the bar display.
The temperature sensor for the coolant temperature gauge is faulty.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
X Stop the vehicle immediately, paying attention to road and traffic condi-
tions, and switch off the engine. Do not continue driving under any circum-
stances.
X Secure the vehicle against rolling away (Y page 178).
X Consult a qualified specialist workshop. Warning and indicator lamps in the instrument cluster
307On-board computer and displays Z

Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ?
N
The red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked
or the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled sufficiently.
X Observe the additional display messages in the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic condi-
tions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 178).
X Leave the vehicle and keep a safe distance from the vehicle until the engine
has cooled down.
X Check the coolant level and top up the coolant, observing the warning notes
(Y page 340).
X If you have to top up the coolant frequently, have the engine cooling system
checked.
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 coolant temperature is below 125 †.
The engine may otherwise be damaged.
X Drive 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. ?
N
The red coolant warning lamp comes on while the engine is running. A
warning tone also sounds.
The coolant temperature has exceeded 124 †. The airflow to the engine radi- ator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Driving when your engine is overhea-
ted can cause some fluids which may have leaked into the engine compart-
ment 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 Observe the additional display messages in the multifunction display.
X Stop the vehicle immediately, paying attention to road and traffic condi-
tions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 178).308
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Tyres
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions h
N
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction)
is lit.
The tyre pressure monitor has detected a loss of pressure in at least one of the
tyres.
G WARNING
Underinflated tyres pose the following risks:
R the tyres may burst, especially as the load and vehicle speed increase
R the tyres may wear excessively and/or unevenly, which may greatly impair
tyre traction
R the driving characteristics, as well as steering and braking, may be greatly
impaired
There is a risk of an accident.
X Stop the vehicle without making any sudden steering or braking manoeu-
vres. Pay attention to the traffic conditions as you do so.
X Secure the vehicle to prevent it from rolling away (Y page 178).
X Observe the additional display messages in the multifunction display.
X Check the tyres and, if necessary, follow the instructions for a flat tyre
(Y page 356).
X Check the tyre pressure (Y page 381).
X If necessary, correct the tyre pressure. h
N
The yellow tyre pressure monitor warning lamp (pressure loss/malfunction)
flashes for approximately one minute and then remains lit.
The tyre pressure monitor is faulty.
G WARNING
The system is possibly unable to detect or register low tyre pressure.
There is a risk of an accident.
X Observe the additional display messages in the multifunction display.
X Visit a qualified specialist workshop. 310
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variations are pos- sible. Note that your vehicle may not be
equipped with all of the functions descri-
bed. This is also the case for systems and
functions relevant to safety.
i Read the information on qualified special-
ist workshops: (Y page 25). Stowage areas
Loading guidelines
G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the boot
lid is open when the engine is running, espe-
cially if the vehicle is in motion. There is a risk of poisoning.
Always switch off the engine before opening
the boot lid. Never drive with the boot lid
open. G
WARNING
If objects, luggage or loads are not secured or not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury, especially when braking or abruptly changing directions.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey. G
WARNING
The exhaust tail pipe and tail pipe trim can
become very hot. If you come into contact
with these parts of the vehicle, you could burn
yourself. There is a risk of injury. Always be particularly careful around the
exhaust tail pipe and the tail pipe trim. Allow
these components to cool down before touch-
ing them.
The handling characteristics of a laden vehi-
cle are dependent on the distribution of the
load within the vehicle. For this reason, you
should observe the following notes when
transporting a load:
R never exceed the maximum permissible
gross vehicle weight or the permissible axle
loads for the vehicle (including occupants).
R the boot is the preferred place to carry
objects.
R position heavy loads as far forwards as pos-
sible and as low down in the boot as pos-
sible.
R the load must not protrude above the upper
edge of the seat backrests.
R always place the load behind unoccupied
seats if possible.
R secure the load with sufficiently strong and
wear-resistant lashing material. Pad sharp
edges for protection.
i Load restraints are available at any quali-
fied specialist workshop, e.g. a Mercedes-
Benz Service Centre. Stowage spaces
Important safety notes G
WARNING
If you do not correctly store objects in the
vehicle interior, they can slip or be flung
around, thus striking vehicle occupants.
There is a risk of injury, especially when brak- ing or abruptly changing directions.
R Always store objects so that they cannot be
flung around in these or in similar situa-
tions.
R Always make sure that objects do not pro-
trude from stowage compartments, lug-
gage nets or stowage nets. 314
Stowage areasStowing and features

R
Close lockable stowage compartments
while driving.
R Stow and secure objects that are heavy,
hard, pointy, sharp-edged, fragile or too
large in the boot.
Observe the loading guidelines (Y page 314).
Front stowage compartments Glove compartment
X
To open: pull handle :and open glove
compartment flap ;.
X To close: fold glove compartment flap ;
upwards until it engages.
The glove compartment can be cooled
(Y page 155).
The glove compartment contains a coin
holder, a pen holder, three credit card holders
and a holder for the COMAND remote control. The glove compartment can only be locked
and unlocked using the emergency key ele-
ment. X
To lock: insert the emergency key element
into the lock and turn it 90° clockwise to
position 2.
X To unlock: insert the emergency key ele-
ment into the lock and turn it 90° anti-
clockwise to position 1.
Spectacles compartment X
To open: press marking :.
The spectacles compartment opens down- wards.
X To close: press marking :again and the
spectacles compartment returns upwards
and engages.
Make sure that the spectacles compartment
is always closed while the vehicle is in motion.
Stowage compartments in the centre con-
sole X
To open: briefly press marking ;.
X To close: push stowage compartment :
in the direction of the arrow until it
engages. Stowage areas
315Stowing and features Z

X
To open: slide cover on chrome element :
backwards.
To close: lightly press chrome element :.
Stowage compartment/telephone com-
partment under the armrest X
To open: press button :or; and fold the
armrest to the left or right.
Depending on the vehicle's equipment, a USB port, an AUX-IN jack or a Media Interface areinstalled in the stowage compartment. A
Media Interface is a universal interface for
portable audio or video equipment, e.g. for an
iPod ®
, iPhone ®
or MP3 player (see the sepa-
rate COMAND Online operating instructions).
Stowage compartment under the driver'sand front-passenger seat G
WARNING
If you exceed the maximum permitted load of the stowage compartment, the cover is
unable to restrain the objects. Objects may be
thrown out of the stowage compartment and
hit vehicle occupants as a result. There is a risk of injury, particularly in the event of sud-
den braking or a sudden change in direction.
Always observe the maximum load of the
stowage compartment. Stow and secure
heavy objects in the boot.
The maximum permissible load of the stow-
age compartment is 1.5 kg. X
To open: pull handle :up and fold
cover ;forwards.
On vehicles with a fire extinguisher, the fire
extinguisher is located in the stowage com-
partment under the driver's seat.
Stowage compartments in the doors You can store items such as a rolled up fluo-
rescent jacket and a small umbrella in stow-
age compartment ;in the doors.
Bottles with a capacity of up to 1.0 lmay be
stored in doors :.316
Stowage areasStowing and features

Rear stowage compartments
Stowage compartment in the rear seat
armrest X
To open: fold down the seat armrest.
X Pull handle :and fold the armrests
upwards.
Stowage compartment in the rear-com-
partment centre console X
To open: if required, fold up the rear seat
armrest.
X Slide cover :in the direction of the arrow.
Depending on the vehicle's equipment, a USB port, an AUX-IN jack, a mobile phone bracketor a 115 V or 230 V socket are installed in the
stowage compartment. Stowage box in the rear seat backrest X
To open: fold down the rear armrest.
X Pull handle :and fold down cover ;.
Depending on the vehicle's equipment, a DVD
player is installed instead of a stowage com-
partment. Stowage nets
Stowage nets are located: R in the front-passenger footwell
R on the back of the driver's and front-
passenger seat
R on the left and right-hand side in the boot
Observe the loading guidelines (Y page 314)
and the safety notes regarding stowage
spaces (Y page 314). Skibag
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 Stowage areas
317Stowing and features
Z

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.
Observe the following points when using the
skibag:
R do not transport more than three pairs of
skis in the skibag.
R when carefully sliding the skis into or
removing them from the skibag, mind the
sharp edges and corners of the skis.
R stow the skis as described in the following:
- when sliding the skis in, position the run-
ning surfaces of the respective pair of
skis together.
- position one pair of skis at the bottom
with the tips of the skis to the outside.
- position the two additional pairs of skis
on the left and right-hand sides above the
lower pair of skis. The tips of the skis
being offset by 90° to the tips of the skis
below.
Unfolding the skibag and loading skis X
Fold down the rear seat armrest.
X Pull handle :and fold down cover ;. X
Release the Velcro fasteners on skibag :.
X Pull skibag :into the vehicle interior and
unfold it.
X Open the boot lid. X
Pull handle :on the flap.
X Fold the flap to the side until it is held in
place by the magnet.
X Slide the skis into the skibag from the boot. X
Pull strap :tight by the loose end until the
skis are held firmly inside the skibag. 318
Stowage areasStowing and features

X
Engage hook ;in securing ring =.
X Pull tensioning strap ?tight by the loose
end.
Removing the skis and folding up the
skibag X
Release lashing strap :.
X Loosen tensioning strap ?.
X Remove hook ;from securing ring =.
X Take the skis carefully out of the skibag
from the boot.
X Close the flap in the boot.
X Fold up the skibag using the folding aid and
close it with the Velcro fasteners.
X Put the skibag into the backrest.
X Fold the cover back up.
You should close the flap in the boot if you do not require the skibag. This will prevent unau-
thorised access to the boot from the vehicle
interior.
Removing the skibag You can remove the skibag if you would like to
clean or dry it.
X Open the boot.
X Open flap :.
X Release the skibag at catch ;and remove. Securing loads using luggage net
hooks
General notes Observe the following notes on securing
loads:
R Secure the load using the luggage net
hooks.
R Do not use elastic straps or nets to secure
a load. These are only intended as an anti-
slip protection for light loads.
R Do not route lashing materials across sharp
edges or corners.
R Pad sharp edges for protection.
Boot There are four luggage net hooks in the boot.
Stowage well under the boot floor
Under the boot floor you can find a multi-pur-
pose recess, e.g. for TIREFIT. Sto
wage areas
319Stowing and features Z