2018 MERCEDES-BENZ G-CLASS stop start

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
?NThe 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 defective.
The coolant is too hot and the engine is no longer being cooled sufficiently.
XObserve the additional display messages in the multifunction display.
XPull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 122).
XLeave the vehicle and keep a safe distance from the vehicle until the engine has cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 234).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the air supply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
XDo not start the engine again until the coolant temperature gauge is below the H
marking (Ypage 161). Otherwise, the engine could be damaged.
XDrive to the nearest qualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-and-go traffic.
?N The red coolant warning lamp comes on while the engine is running.
The coolant temperature gauge has exceeded the Hmarking (
Ypage 161). The
airflow to the engine radiator may be blocked or the coolant level may be too low.
GWARNING
The engine is not being cooled sufficiently and may be damaged.
Do not drive when your engine is overheated. This can cause some fluids which
may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can also cause serious burns which can occur
just by opening the hood.
There is a risk of injury.
XObserve the additional display messages in the multifunction display.
XPull over and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 122).
XLeave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 234).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the air supply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
200Warning and indicator lamps in the instrument cluster
On-board computer and displays

GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
Notes on the oil level
Depending on your driving style, the vehicle
consumes up to 0.9 US qt (0.8 liters) of oil per
600 mile s(1000 km). The oil consumption may
be higher than this when the vehicle is new or if you frequently drive at high engine speeds.
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
Rif the engine is not at normal operating tem-
perature, e.g. if the engine was only started
briefly, wait approximately 30 minutes before
carrying out the measurement
Checking the oil level using the oil dip-
stick
Example: engine compartment
On the G 63 AMG, the oil level can be checked
using the oil dipstick.
XPull oil dipstick :out of the dipstick guide
tube.
XWipe off oil dipstick :.
XSlowly slide oil 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.
On all other models, the on-board computer
must be used to check the engine oil level.
Checking the oil level using the on-
board computer
G 550: the oil level can only be checked using
the on-board computer.
XMake sure that the SmartKey is in position 2
in the ignition lock.
XPress 9or: on the steering wheel to
select the following message: Measuring
EngineOilLevelAccurateOnlyWhenVehicle Is Level
The measurement takes a few seconds. You will
see one of the following messages in the multi-
function display:
REngine Oil Level OK
RAdd1.1litersEng.OilatNextRefu‐eling
XAdd oil if necessary.
If the engine is at normal operating temperature and the Reduce Engine Oil Level
display
appears, too much oil has been added.
XHave excess oil siphoned off.
If the For Engine Oil Level Ignition
Must Be Onmessage appears:
XTurn the SmartKey to position 2in the igni-
tion lock (Ypage 105).
If the Need More Time to Check Engine
Oil Levelmessage appears:
XIf the engine is at normal operating tem-
perature: repeat the measurement after
approximately five minutes.
XIf the engine is not at normal operating
temperature: e.g. if the engine was only star-
ted briefly, repeat the measurement after
approximately 30 minutes.
232Engine compartment
Maintenance and care

XMake sure that tab;is below when re-
installing cover ring :(Ypage 245).
XFor safety reasons, regularly check to ensure
that the wheel is securely fastened.
Flat tire
Preparing the vehicle
Observe the notes on changing a wheel
(Ypage 275).
XStop the vehicle on solid, non-slippery and
level ground, as far away as possible from
traffic.
XSwitch on the hazard warning lamps.
XSecure the vehicle against rolling away
(Ypage 122).
XIf possible, bring the front wheels into the
straight-ahead position.
XSwitch off the engine.
XRemove the SmartKey from the ignition lock.
The steering wheel lock stays active for as
long as the SmartKey is removed.
XMake sure that the passengers are not endan-
gered as they do so. Make sure that no one is
near the danger area while a wheel is being
changed. Anyone who is not directly assisting
in the wheel change should, for example,
stand behind the barrier.
XGet out of the vehicle. Pay attention to traffic
conditions when doing so.
XClose the driver's door.
XPlace the warning triangle a suitable distance
away (Ypage 243). Observe legal require-
ments.
Battery (vehicle)
Important safety notes
Special tools and expert knowledge are required
when working on the battery, e.g. removal and
installation. You should therefore have all work
involving the battery carried out at a qualified
specialist workshop.
GWARNING
Work carried out incorrectly on the battery
can lead, for example, to a short circuit and
thus damage the vehicle electronics. This can
lead to function restrictions applying to
safety-relevant systems, e.g. the lighting sys-
tem, the ABS (anti-lock braking system) or the
ESP
®(Electronic Stability Program). The oper-
ating safety of your vehicle may be restricted.
You could lose control of the vehicle, for
example:
Rwhen braking
Rin the event of abrupt steering maneuvers
and/or when the vehicle's speed is not
adapted to the road conditions
There is a risk of an accident.
In the event of a short circuit or a similar inci- dent, contact a qualified specialist workshop
immediately. Do not drive any further. You
should have all work involving the battery car-
ried out at a qualified specialist workshop.
For further information about ABS and ESP
®,
see (Ypage 58) and (Ypage 59).
GWARNING
Electrostatic build-up can lead to the creation of sparks, which could ignite the highly explo-
sive gases of a battery. There is a risk of an
explosion.
Before handling the battery, touch the vehicle
body to remove any existing electrostatic
build-up.
The highly flammable gas mixture forms when
charging the battery as well as when jump-start-
ing.
Always make sure that neither you nor the bat-
tery is electrostatically charged. A build-up of
electrostatic charge can be caused, for exam-
ple:
Rby wearing clothing made from synthetic
fibers
Rdue to friction between clothing and seats
Rif you push or pull the battery across the car-
pet or other synthetic materials
Rif you rub the battery with a cloth
GWARNING
During the charging process, a battery produ-
ces hydrogen gas. If a short circuit occurs or
246Battery (vehicle)
Breakdown assistance

In the event of damage to the engine,
transmission or electrical system
XShift thetransfer cas eto neutra l
(Ypage 150).
XShift th eautomatic transmission to position
i.
In the event of damage to the transfer
case
Hav eth epropelle rshafts between th eaxles and
th etransfer cas eremoved.
In the event of damage to the front axle
Hav eth epropelle rshaf tbetween th erear axl e
and th etransfer cas eremoved.
Then hav eth evehicl etowed away wit hth efron t
axl eraised.
In the event of damage to the rear axle
Hav eth epropelle rshaf tbetween th efron taxl e
and th etransfer cas eremoved.
Then hav eth evehicl etowed wit hth erear axl e
raised and whee lroller sunder th efron taxle.
Tow-starting (emergency engine
starting)
!
Vehicles wit hautomatic transmission must
no tbe tow-started. You could otherwise dam-
age th eautomatic transmission .
You can fin dinformation on "Jump-starting "
under (
Ypage 249).
Fuses
Important safety notes
GWARNIN G
If you manipulat eor bridge afault yfus eor if
you replace it wit h afusewit h a higher amper-
age, th eelectric cables could be overloaded.
This could result in afire. Ther eis aris kof an
acciden tand injury.
Always replace fault yfuses wit hth especifie d
ne wfuses having th ecorrec tamperage .The fuses in your vehicl
eserve to close down
fault ycircuits. If afus eblows ,all th ecompo -
nent son th ecircuit and their function sstop
operating .
Blown fuses must be replace dwit hfuses of th e
sam erating ,whic hyou can recogniz eby th e
color and value .The fus erating sare listed in th e
fus eallocation chart (
Ypage 255).
If anewly inserted fus ealso blows ,hav eth e
caus etrace dand rectifie dat aqualified special-
ist workshop, e.g. an authorize dMercedes-Ben z
Center.
!Only use fuses that hav ebeen approve dfor
Mercedes-Ben zvehicles and whic hhav eth e
correc tfus erating for th esystem concerned.
Otherwise, component sor systems could be
damaged.
!Mak esur ethat no moisture can ente rth e
fus ebox when th ecover is open .
!When closingth ecover ,mak esur ethat it is
lyin gcorrectl yon th efus ebox .Moistur eseep -
ing in or dirt could oth
erwise impair th
eoper -
ation of th efuses.
Before changing a fuse
Pay attention to th eimportant safet ynote s
(Ypage 254).
XSwitc hoff th eengine.
XSwitc hoff all electrical consumers.
XRemove th eSmartKey from th eignition lock.
All indicator lamp sin th einstrumen tcluste r
must be off .
XSecureth evehicl eagainst rollin gaway
(Ypage 122).
The fuses are locate din various fus eboxes:
RMain fus ebox on th efront-passenger side of
th edashboar d
RFusebox in th efront-passenger footwell
RFus ebox in th etransmission tunne l
RFusebox in th ecargo compartmen t
The fus eallocation chart and th espar efuses are
in th efus ebox on th edashboar don th efront-
passenger side (
Ypage 255).
The fus eextractor is in th evehicl etool kit
(
Ypage 244).
254Fuses
Breakdown assistance