ECU MERCEDES-BENZ C CLASS 2018 Repair Manual

Stowage areas
Loading guidelines
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engine is running,
especially if the vehicle is in motion. There is a
risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
open.
GWARNING
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, particu-
larly in the event of sudden braking or a sud-
den change in direction.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
GWARNING
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 vehicle
are dependent on the distribution of the load
within the vehicle. For this reason, you should
observe the following notes when transporting a
load:
RNever exceed the maximum permissible
gross vehicle mass or the gross axle weight
rating for the vehicle (including occupants).
The values are specified on the vehicle iden- tification plate on the B-pillar of the driver's
door.
RThe trunk is the preferred place to carry
objects.
RPosition heavy loads as far forwards as pos-
sible and as low down in the trunk as possible.
RThe load must not protrude above the upper
edge of the seat backrests.
RAlways place the load behind unoccupied
seats if possible.
RSecure the load with sufficiently strong and
wear-resistant tie-downs. Pad sharp edges for
protection.
Stowage spaces
Important safety notes
GWARNING
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.
RAlways stow objects so that they cannot be
thrown around in such situations.
RAlways make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets.
RClose the lockable stowage spaces before
starting a journey.
RAlways stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
Observe the loading guidelines (
Ypage 280).
280Stowage areas
Stowage and features

Vehicle occupants could be struck in the
event of sudden braking or an accident, for
instance, if you:
Rtransport other heavy or sharp-edged
objects in the skibag
Rdo 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.
Securing the ski and snowboard bag in
the trunk
XFold the middle rear seat backrest forwards
(Ypage 284).
XSlide the ski and snowboard bag between the
two outside rear seat backrests. Ensure that
the wheels of the ski and snowboard bag are
in the trunk.
XOpen the ski/snowboard bag with zip :and
place the skis or snowboards inside it.
XClose the ski and snowboard bag.
XPull tensioning strap ;tight by the loose end
until the skis or snowboards are held firmly
inside the ski/snowboard bag.
XEngage tensioning strap =in a diagonal pat-
tern on hooks ?in cargo tie-down rings Aas
shown.
Rear bench seat through-loading fea-
ture
Important safety notes
GWARNING
If the rear bench seat/rear seat and seat
backrest are not engaged they could fold for-
wards, e.g. when braking suddenly or in the
event of an accident.
RThe vehicle occupant would thereby be
pushed into the seat belt by the rear bench
seat/rear seat or by the seat backrest. The
seat belt can no longer offer the intended
level of protection and could even cause
injuries.
RObjects or loads in the trunk cannot be
restrained by the seat backrest.
There is an increased risk of injury.
Before every trip, make sure that the seat
backrests and the rear bench seat/rear seat
are engaged.
!When folding the rear seat backrest for-
wards, ensure that there are no items lying on the seat cushions. These items could other-
wise be damaged or could themselves dam-
age the rear seats.
Observe the loading guidelines (
Ypage 280).
The outside and the middle rear seat backrests
can be folded down separately to increase the
trunk capacity. The division ratio is 40/20/40.
Stowage areas283
Stowage and features
Z

Middle rear seat backrest
XMove the driver's or front-passenger seat
forward if necessary.
XFold seat backrest:back until it engages.
Red lock status indicator ;is no longer visi-
ble.
XAdjust the head restraints if necessary
(Ypage 103).
XMove 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.
XTo lock: fold the left and center seat backr-
ests forward. Make sure that the center and
left seat backrests are engaged and joined
together.
XSlide catch :upwards.
XTo unlock: fold the left and center seat backr-
ests forward.
XSlide catch :downwards.
Securing loads
Cargo tie-down rings
Observe the following notes on securing loads:
RObserve the loading guidelines (Ypage 280).
RSecure the load using the cargo tie-down
rings.
RDistribute the load on the cargo tie-down
rings evenly.
RDo not use elastic straps or nets to secure a
load, as these are only intended as an anti-slip protection for light loads.
RDo not route tie-downs across sharp edges orcorners.
RPad sharp edges for protection.
Vehicles with the through-loading feature in the
rear bench seat:
XFold up the carpet around the rear seat back-
rest.
XFold up the front cargo tie-down rings and
insert them through the slot in the carpet.
Bag hook
GWARNING
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.
Stowage areas285
Stowage and features
Z

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.
:Bag hook
Parcel net
Important safety notes
GWARNING
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.
RAlways stow objects so that they cannot be
thrown around in such situations.
RAlways make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets.
RClose the lockable stowage spaces before
starting a journey.
RAlways stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects in
the trunk.
Observe the following notes:
RObserve the loading guidelines (Ypage 280).
Attaching the parcel net
XVehicles with rear bench seat through-
loading facility: fold up the front cargo tie-
down rings and push them through the slots in
the carpet.
XAttach parcel net :to the front and rear
cargo tie-down rings.
EASY-PACK trunk box
Important safety notes
GWARNING
When the floor moves up, your hands may
become trapped on the frame of the EASY-
PACK trunk box and objects may be flung
upwards. There is a risk of injury.
When the floor moves up, make sure that your
hands are not within the movement area of
the floor. If someone becomes trapped, care- fully push the center of the floor down. Before
the floor moves up, move all objects from the
floor.
!When the EASY-PACK trunk box is exten-
ded, objects may neither be placed on the
frame of the box nor pushed down onto the
frame from above. The box may otherwise be damaged.
!Sharp-edged, pointed or fragile objects can
damage the EASY-PACK trunk box and may be
thrown out. There is a risk of injury.
Do not transport sharp-edged, pointed or
fragile objects in the EASY-PACK trunk box.
Always store and secure these or similar
objects in the trunk outside the EASY-PACK
trunk box.
286Stowage areas
Stowage and features

!If you exceed the maximum permitted load
of the EASY-PACK trunk box, objects may be
thrown out of the EASY-PACK trunk box and
strike vehicle occupants. There is a risk of
injury, particularly in the event of sudden
braking or a sudden change in direction.
Always observe the maximum permitted load
of the EASY-PACK trunk box. Always store
and secure heavy objects in the trunk outside
the EASY-PACK trunk box.
The maximum permitted load of the EASY-PACK
trunk box is 22 lbs (10 kg). With a load of above
approximately 11 lbs (5 kg), the bottom of the
box moves down until it rests on the mat of the
trunk floor. Thus, overloading of the box is avoi-
ded.
Adjusting the height to any position
Example: EASY-PACK trunk box
XPull the box out by handle :in the direction
of the arrow as far as it will go.
XTo lower the load surface: push down with
your hand in the center of load surface ;in
the direction of the arrow until load sur-
face ;has reached the desired position.
XTo raise the load surface: press switch=.
Load surface ;of the box moves up auto-
matically.
XTo stow the box: push the box in by han-
dle :as far as it will go.
Removing and installing
XTo install: insert retainer ;of box :into
slots =
XRaise box :and press hooks Ainto anchor-
age ?as far as they will go.
XTurn left-hand rotating catch Bcounter-
clockwise and right-hand rotating catch B
clockwise by 90°.
XTo remove: turn left-hand rotating catch B
clockwise and right-hand rotating catch B
counter-clockwise by 90°.
XMove box :downwards and pull it out from
anchorages ?.
Store the EASY-PACK trunk box in a horizontal
position after removal, e.g. on a suitable shelf.
Stowage well under the trunk floor
The following items are located beneath the
trunk floor, for example:
Rthe folding box
Rtire-change tool kit
RTIREFIT kit
!Unhook the handle before again before clos-
ing the trunk lid and clip it in securely to pre-
Stowage areas287
Stowage and features
Z

vent the handle flap from protruding. Other-
wise, you could damage the handle.
XTo open:pull handle :up.
XHook handle :into rain trough ;.
Roof carrier
Important safety notes
GWARNING
When you load the roof, the center of gravity
of the vehicle rises and the driving character-
istics change. If you exceed the maximum roof
load, the driving characteristics, as well as
steering and braking, will be greatly impaired.
There is a risk of an accident.
Never exceed the maximum roof load and
adjust your driving style.
You will find information on the maximum roof
load in the "Technical data" section
(
Ypage 367).
!Mercedes-Benz recommends that you only
use roof carriers that have been tested and approved for Mercedes-Benz vehicles. This
helps to avoid damage to the vehicle.
Position the load on the roof carrier in such a
way that the vehicle will not sustain damage
even when it is in motion.
Depending on the vehicle equipment, ensure
that when the roof carrier is installed you can:
Rraise the sliding sunroof/panorama roof
with power tilt/sliding panel fully
Ropen the trunk lid fully
!To avoid damaging or scratching the covers,
do not use metallic or hard objects to open
them.
An incorrectly secured roof carrier or roof load
may become detached from the vehicle. You
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
XCarefully open covers :in the direction of
the arrow and fold upwards.
XOnly secure the roof carrier to the anchorage points under covers :.
XObserve the manufacturer's installation
instructions.
288Stowage areas
Stowage and features

Features
Cup holder
Important safety notes
GWARNIN G
The cup holder canno thold acontainer secure
whils ttraveling .If you use acup holder whils t
traveling ,th econtainer may be flun garoun d
and liquid may be spilled. The vehicl eoccu-
pants may come int ocontact wit hth eliquid
and if it is hot ,they may be scalded. You may
be distracte dfrom th etraffic condition sand
you could lose control of th evehicle. Ther eis
a ris kof an acciden tand injury.
Only use th ecup holder when th evehicl eis
stationary. Only use th ecup holder for con-
tainers of th eright size. Always close th econ-
tainer, particularly if th eliquid is hot .
GWARNING
If object sin th epassenger compartmen tare
stowed incorrectly, they can slide or be
thrown aroun dand hit vehicl eoccupants. In
addition ,cupholders, open stowage spaces
and mobile phon ebrackets canno talways
retain all object sthey contain .Ther eis aris k
of injury, particularly in th eevent of sudde n
braking or asudde nchang ein direction .
RAlways stow object sso that they canno tbe
thrown aroun din suc hsituations.
RAlways mak esure that object sdo no tpro -
trude from stowage spaces, parcel nets or
stowage nets .
RClose thelockable stowage spaces before
starting ajourney.
RAlways stow and secure heavy, hard ,poin -
ted, sharp-edged, fragile or bulk yobject sin
th etrunk .
!Only use th ecup holders for containers of
th eright siz eand whic hhave lids. The drinks
could otherwise spill .
!Do notexpos edrinks bottles in th ecup
holder in th ecente rconsole to continuous,
stron gand direct sunlight. The passenger
compartmen tin th earea of th ecente rcon- sole can otherwise be damaged by th
econ-
centrate dand reflecte dsunlight.
Observ eth eloadin gguidelines (
Ypage 280).
Cup holder in the front center console
If you remove th ecup holder insert ,you can use
th eresulting compartmen tfor stowage .
XTo open:open th estowage compartmen t
(Ypage 281).
XTo remove: slide catch=forward and pull
out cup holder ;.
XTo insert:insert cup holder ;and slide bac k
catch =.
XTo close: push cover :of th estowage com-
partmen tclosed.
You can remove th ecup holder' srubber mat for
cleaning. Clean wit hclear, lukewarm water only.
Cup holder in the rear seat armrest
!Do no tsit on or support your body weigh ton
th erear seat armres twhen it is folded down ,
as you could otherwise damag eit.
!Close th ecup holder before foldin gth erear
seat armres tup. Otherwise, th ecup holder
could be damaged.
Features289
Stowage and features
Z

Emergency call
Important safety notes
GWARNING
It can be dangerous to remain in the vehicle,
even if you have pressed the SOS button in an emergency if:
Ryou see smoke inside or outside of the vehi-
cle, e.g. if there is a fire after an accident
Rthe vehicle is on a dangerous section of
road
Rthe vehicle is not visible or cannot easily beseen by other road users, particularly when
dark or in poor visibility conditions
There is a risk of an accident and injury.
Leave the vehicle immediately in this or simi-
lar situations as soon as it is safe to do so.
Move to a safe location along with other vehi-
cle occupants. In such situations, secure the
vehicle in accordance with national regula-
tions, e. g. with a warning triangle.
General notes
Observe the notes on system activation
(Ypage 293).
An emergency call is dialed automatically if an
air bag or Emergency Tensioning Device is trig-
gered. You cannot end an automatically trig-
gered emergency call yourself.
An emergency call can also be initiated man-
ually.
As soon as the emergency call has been initi-
ated, the indicator lamp in the SOS button
flashes. The Connecting Call
message
appears in the multifunction display.
The audio output is muted.
Once the connection has been made, the Call
Connectedmessage appears in the multifunc-
tion display.
All important information on the emergency is
transmitted, for example:
RCurrent location of the vehicle (as determined
by the GPS system)
RVehicle identification number
RInformation on the severity of the accident
Shortly after the emergency call has been initi-
ated, a voice connection is automatically estab- lished between the Customer Assistance Center
and the vehicle occupants.
RIf the vehicle occupants respond, the
Mercedes-Benz Customer Assistance Center
attempts to get more information on the
emergency.
Rif there is no response from the vehicle occu-
pants, an ambulance is immediately sent to
the vehicle.
If no voice connection can be established to the
Mercedes-Benz Customer Assistance Center,
the system has been unable to initiate an emer-
gency call.
This can occur, for example, if the relevant
mobile phone network is not available. The indi-
cator lamp in the SOS button flashes continu-
ously.
The Call Failed
message appears in the mul-
tifunction display and must be confirmed.
In this case, summon assistance by other
means.
Making an emergency call
XTo initiate an emergency call manually:
press cover :briefly to open.
XPress and hold the SOS button for at least one
second ;.
The indicator lamp in SOS button ;flashes
until the emergency call is concluded.
XWait for a voice connection to the Mercedes-
Benz Customer Assistance Center.
XAfter the emergency call, close cover :.
If the mobile phone network is unavailable,
mbrace will not be able to make the emergency
call. If you leave the vehicle immediately after
pressing SOS button ;, you do not know if
mbrace has successfully made the emergency
call. In this case, always summon assistance by
other means.
294Features
Stowage and features

The garage door opener is compatible with
devices which operate in the frequency range
of 280 to 433 MHz.
RReplace the batteries in garage door remote
controlA. This increases the likelihood that
garage door remote control Awill transmit a
strong and precise signal to the integrated
garage door opener.
RWhen programming, hold remote control A
at varying distances and angles and from but-
tons ;to? which you are programming. Try
various angles at a distance between 2and
8 inches (5to 20 cm) or at the same angle but
at varying distances.
RIf another remote control Ais available for
the same garage door drive, repeat the same
programming steps with this remote control
A. Before performing these steps, make sure
that new batteries have been installed in
garage door drive remote control A.
RNote that some remote controls only transmit
for a limited amount of time (the indicator
lamp on the remote control goes out). Press
buttonBon remote control Aagain before
transmission ends.
RAlign the antenna cable of the garage door
opener unit. This can improve signal recep-
tion/transmission.
Opening/closing the garage door
After it has been programmed, the integrated
garage door opener performs the function of the
garage door system remote control. Please also
read the operating instructions for the garage
door system.
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 136).
XPress button ;,=or? which you pro-
grammed to operate the garage door.
Garage door system with a fixed code: indi-
cator lamp :lights up green.
Garage door system with a rolling code: indi-
cator lamp :flashes green.
The transmitter will transmit a signal as long
as the button is pressed. The transmission is
halted after a maximum of ten seconds and
indicator lamp :lights up yellow.
XPress button ;,=or? again if necessary.
Clearing the memory
Make sure that you clear the memory of the
integrated garage door opener before selling the
vehicle.
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 136).
XPress and hold buttons ;and ?.
The indicator lamp initially lights up yellow
and then green.
XRelease buttons ;and ?.
The memory of the integrated garage door
opener in the rear-view mirror is cleared.
Floormats
GWARNING
Objects in the driver's footwell can restrict the pedal travel or obstruct a depressed pedal.
The operating and road safety of the vehicle is
jeopardized. There is a risk of an accident.
Make sure that all objects in the vehicle are
stowed correctly, and that they cannot enter
the driver's footwell. Install the floormats
securely and as specified in order to ensure
sufficient clearance for the pedals. Do not use
loose floormats and do not place floormats on
top of one another.
XSlide the relevant seat back.
XTo install: place the floormat in the footwell.
XPress studs :onto retainers ;.
XTo remove:pull the floormat off retainers ;.
XRemove the floormat.
302Features
Stowage and features

Depending on the engine, the oil dipstick may be
in a different location.
When checking the oil level:
Rpark the vehicle on a level surface
Rthe engine should be switched off for approx-
imately five minutes if the engine is at normal
operating temperature
Rall vehicles (except Mercedes‑AMG C 63
and Mercedes ‑AMG C 63 S):if the engine is
not at normal operating temperature, e.g. if
the engine was started only briefly, wait
approximately 30 minutes before carrying out
the measurement
Mercedes ‑AMG C 63 and Mercedes ‑AMG C
63 S: the oil level must only be checked when
the engine is at normal operating temperature.
Checking the oil level using the oil dip-
stick
Check the oil level with the oil dipstick (exam-
ple)
XPull oil dipstick :out of the dipstick guide
tube.
XWipe off oil dipstick :.
XSlowly slide dipstick :into the guide tube to
the stop, and take it out again after approx-
imately three seconds.
If the level is between MIN mark =and MAX
mark ;, the oil level is correct.
XIf the oil level has dropped to MIN mark =or
below, add 1.1 US qt (1.0 l) of engine oil.
Adding engine oil
HEnvironmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful to
the environment.
!Use only engine oils and oil filters that are
approved for vehicles with a service system. A list of the engine oils and oil filters that have
been tested and approved in accordance with
Mercedes-Benz Specifications for Service
Products is available at any authorized
Mercedes-Benz Center.
The following cause engine failure or damage
to the exhaust system:
RUse of engine oils and oil filters that have
not been expressly approved for the service
system
RReplacement of engine oil and oil filter after
the replacement interval specified by the
service system has expired
RUse of engine oil additives
!Do not add too much oil. adding too much
engine oil can result in damage to the engine
or to the catalytic converter. Have excess
engine oil siphoned off.
Add engine oil (example)
XTurn cap :counter-clockwise and remove it.
XAdd engine oil.
If the oil level is at or below the MIN mark on
the oil dipstick, add 1.1 US qt (1.0 l)of engine
oil.
XReplace cap :on the filler neck and tighten
clockwise.
Ensure that the cap locks into place securely.
XCheck the oil level again with the oil dipstick
(Ypage 305).
Further information on engine oil (
Ypage 364).
Engine compartment305
Maintenance and care
Z