heating MERCEDES-BENZ G-CLASS SUV 2016 Owner's Guide

Display messages
Possible causes/consequence
sand M
MSolutions The poly-V-belt may have torn.
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Check the poly-V-belt.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult aqualified specialist workshop.
If the poly-V-belt is OK:
X Wait until the display message disappears before restarting the
engine. The engine may otherwise be damaged.
X Pay attention to the coolant temperature gauge.
X Consult aqualified specialist workshop. # The battery is no longer being charged.
Aw
arning tonea lso sounds.
Possible causes:
R faulty alternator
R torn poly-V-belt
R am alfunction in the electronics
X Stop the vehicle immediately, paying attention to road and traffic
conditions, and switch off the engine.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult aqualified specialist workshop.
If the poly-V-belt is OK: X Consult aqualified specialist workshop. 4
Check Check
eng.
eng.oil
oillev.
lev.
when
when next
nextrefuelling
refuelling The engine oil level has dropped to the minimum level.
Aw
arning tonea lso sounds.
X Check the oil level when next refuelling, at the latest (Y page 213).
X If necessary, top up the engine oil (Y page 213).
X Have the engine checked at aqualified specialist workshop if the
engine oil needs topping up more often than usual. 8
Reserve fuel level Reserve fuel level 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. Display me
ssages
147On-board compute rand displays Z

Display messages
Possible causes/consequence
sand M
MSolutions C There is very little fuel in the fuel tank.
Operation of the auxiliary heating is deactivated.
X You must refuel at the nearest filling station. ¸
Replace Replace
air
aircleaner
cleaner
element
element Veh
icleswithad ieselengine: the engine ai rfilter is dirty and must
be replaced.
X Consult aquali fied specialist workshop. !
Clean the fue
lfil‐
Clean the fuel fil‐
ter ter Veh
icleswithad ieselengine: there is water in the fue lfilter. The
water mus tbed raine doff.
X Consult aquali fied specialist workshop. Ø
Refill AdBlue See Refill AdBlue See
Owner'
sManual
Owner's Manual The AdBlue
®
level has fallen below the reserve range. Awarning tone
also sounds.
X Have AdBlue ®
refilled as soon as possible at aqualified specialist
workshop.
or X Refill AdBlue ®
yourself as soon as possible (Y page 111).Ø
Refill AdBlue No Refill AdBlue No
start in .. km start in .. km The AdBlue
®
level is only sufficient for the indicated distance. Awarn-
ing tonea lso sounds.
X Have AdBlue ®
refilled as soon as possible at aqualified specialist
workshop.
or
X Refill AdBlue ®
yourself immediately (Y page 111).Ø
Refill AdBlue Eng. Refill AdBlue Eng.
start not possible start not possible The AdBlue
®
tank is empty. Awarning tonea lso sounds. You can no
longer start the engine.
X Consult aqualified specialist workshop immediately.
or X Refill AdBlue ®
yourself immediately (Y page 111).Ø
Check AdBlue See Check AdBlue See
Owner's Manual Owner's Manual The AdBlue
®
system is malfunctioning. Awarning tonea lso sounds.
X Consult aqualified specialist workshop. Ø
Eng. start not pos‐ Eng. start not pos‐
sible in ..km sible in ..km The AdBlue
®
system is malfunctioning. Awarning tonea lso sounds.
X Consult aqualified specialist workshop immediately. Ø
Eng. start not pos‐ Eng. start not pos‐
sible sible The AdBlue
®
system is malfunctioning. Awarning tonea lso sounds.
You can no longer start the engine.
X Consult aqualified specialist workshop immediately. 148
Display messagesOn-board computer and displays

Display messages
Possible causes/consequence
sand M
MSolutions ^
Rear Rear
left
leftseat
seatback‐
back‐
rest not
rest not
locked lockedorFront right Front right
seat backrest not
seat backrest not
locked locked G
WARNING
The driver's or front-passenger seat backrest is not engaged.
X Push the backrest back until it engages. D
Power steering mal‐ Power steering mal‐
function See Own‐ function See Own‐
er's Manual er's Manual The power steering assistance is faulty.
Aw
arning tonea lso sounds.
G WARNING
You will need to use more force to steer.
There is arisk of an accident.
X Check whether you are able to apply the extras teeringforce
required.
X If you are able to steer safely: carefully drive on toaqualified
specialist workshop.
X If you are unable to steer safely: do not drive on. Contact the
nearest qualified specialist workshop. &
inoperative inoperative
Battery
Battery
low
low You have attempted to switch on the auxiliary heating or to activate a
departure time using the on-board computer after operating the aux-
iliary heating twice.
X Let the engine run for ten seconds.
The auxiliary heating is operational again. The on-board voltage is too low. The auxiliary heating has switched
itself off or cannot be switched on (Y page 89).
X Drive for aconsiderable distance.
The battery charges. The auxiliary heating is operational again as
soon as the on-board electrical system voltage is sufficient. &
inoperative Refuel inoperative Refuel
vehicle vehicle There is too little fuel in the fuel tank.T
he auxiliary heating cannot be
switched on (Y page 89).
X Refuel at the nearest filling station. &
inoperative inoperative
See
SeeOwn‐
Own‐
er's Manual
er's Manual The auxiliary heating is temporarily malfunctioning or faulty.
X When the vehicle is on alevel surface and the engine has cooled
down, make up to four attempt stoswitch on the auxiliary heating,
waiting several minutes between each attempt (Y page 89).
X If the auxiliary heating does not switch on, consult aqualified spe-
cialist workshop. ¥
Top up washer fluid Top up washer fluid The washer fluid level in the washer fluid reservoir has dropped below
the minimum.
X Top up the washer fluid (Y page 215).154
Display messagesOn-board computer and displays

Engine
Warning/
indicator
lamp
N N
Signal type
Possible causes/consequences and M
MSolutions ;
N
The yellow engine diagnostics warning lamp lights up whil ethe engine is run-
ning.
There may be afault with the following, for example:
R engine management
R fuel injection system
R exhaust system
R fuel system
The emission limit values may be exceeded and the engine may be runnin gin
emergenc ymode.
X Consult aqualified specialist workshop immediately.
Vehicles with adiesel engine: the fuel tank has been run dry (Y page 110).
X Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergenc ymode is
cancelled. The vehicle does not have to be checked. 8
N
The yellow reserve fuel warning lamp lights up 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
On diesel engine vehicles, the preglow indicator lamp does not light up when the
key is in position 2(Y page 96).
The preglow system is malfunctioning.
X Consult aqualified specialist workshop immediately. ?
N
The red coolant warning lamp lights up while the engine is running and the
coolant temperature display is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored. The engine could be dam-
aged if the coolant temperature is too high.
X Stop the vehicle immediately,p aying attention to road and traffic conditions,
and switch off the engine. Do not continue driving.
X Secure the vehicle against rolling away (Y page 113).
X Consult aqualified specialist workshop. 162
Warning and indicator lamps on the instrument clusterOn-board computer and displays

Cigarett
elighter G
WARNING
Yo uc an burn yourself if you touch the hot
heating element or the socket of the cigarette lighter.
In addition, flammable materials can ignite if:
R the hot cigarette lighter falls
R ac hild hold sthe hot cigarette lighter to
objects, for example
There is arisk of fire and injury.
Always hold the cigarette lighter by the knob.
Always make sure that the cigarette lighter is
out of reach of children. Never leave children unattended in the vehicle. X
Pres sinc igarett elighter :.
Cigarette lighter :will pop out automatically
when the heating element is red-hot.
You can use the cigarett elighter socket for
accessories up to 180 W(Ypage 209). 12
Vsockets
General notes !
If you are simultaneously using all three
socketsint he vehicle, make sure that you do
not exceed the maximum current draw of
45 A. Otherwise, you will overload the fuses.
The sockets can be used for accessories with a maximum current draw of 180 W(15 A) each,
e.g. chargers fo rmobile phones.
If you use the sockets for long periods whe nthe
engine is switched off, the battery may dis-
charge. X
Turn the key to position 2in the ignition
lock.
Socket in the front-passenger footwell X
Lift up the cover of the socket.
The cigarette lighter socket can be also used
(Y page 209). It can also be used if the key has
been removed from the ignition lock.
Socket in the rear compartment X
Lift up the cover of the socket.
Socket in the luggag ecompartment Features
209Stowing and features Z

Engine compartment
Bonnet
Importan tsafety notes G
WARNING
An unlocked bonne tmay open up when the
vehicl eisinm otion and block yourv iew.There
is ar isk of an accident.
Never unlock the bonnet when driving. Before
every trip, ensure that the bonnet is locked. G
WARNING
When being opened and closed ,the bonnet
may suddenly fall into the closed position.
There is arisk of injury to persons in the range
of movement of the bonnet.
Open and close the bonnet only when nobody
is in the range of movement. G
WARNING
If you open the bonnet while the engine is
overheating or while there is afire in the
engine compartment, you coul dcome into
contact with hot gase sorother leaking ser-
vice products. There is adange rofinjury.
Allow an overheating engine to cool down
before opening the bonnet. If there is afire in
the engine compartment, leave the bonnet
closed and notify the fire brigade. G
WARNING
The ignitio nsystem and the fuel injection sys-
tem operate with ahigh voltage. If you touch
the live components, you coul dreceive an
electric shock. There is adange rofinjury.
Never touch components of the ignitio nsys-
tem or the fuel injection system when the
ignitio nisswitched on. G
WARNING
There are moving components in the engine
compartment. Certain components may con-
tinue to move or suddenly move again even
after the ignitio nhas been switched off, e.g.
the radiator fan. There is arisk of injury. If you have to carry out work in the engine
compartment:
R switch off the ignition
R never touch the dangerou sarea ssurround-
ing moving components, e.g. the rotation
area of the fan
R remove jewellery and watches
R keep items of clothing and hair, for exam-
ple, awayf rom moving parts.
Do not touch the diagnostics socket when the
ignition is switched on.
Openin gthe bonnet G
WARNING
Certain components in the engine compart-
ment could be very hot, e.g. the engine, the
radiator and parts of the exhaust system.
There is arisk of injury when accessing the
engine compartment.
As far as possible,a llow the engine to cool
downa nd only touch the components descri-
bed in the following. G
WARNING
When the bonnet is open, and the windscreen wipers are set in motion, you can be injured by
the wiper linkage. There is arisk of injury.
Always switch off the windscreen wipers and
the ignitio nbefore opening the bonnet.
! Make sure that the windscreen wipers are
not folde dawayfrom the windscreen. Other-
wise, you coul ddamage the windscreen wip-
ers or the bonnet. Engine compartment
211Maintenanceand care Z

The bonnet release lever is in the footwell on the
left-hand side of the vehicle when viewed in the
direction of travel.
X Make sure that the windscreen wipers are
switched off.
X Pull bonnet release lever :.
The bonnet is released. X
Lift the bonnet slightly.
X Push bonnet catch ;in the direction of the
arrow and lift the bonnet.
The bonnet is opened and held open auto-
matically by the gas-filled strut.
Closing the bonnet X
Lower the bonnet and let it fall from aheight
of approximately 20 cm.
X Check that the bonnet has engaged properly.
If the bonnet can be raiseds lightly, it is not
properl yengaged .Open it again and close it
with alittle more force. Radiator
Do not cover up the radiator. Do not use thermal mats, insect protection covers or anything sim-
ilar. Otherwise, the valuesoft he Europeanon-
board diagnostics may be affected .Some of
thes evalue sare required by la wand must
always be correct. Engine oil
Importan tsafety notes G
WARNING
Certain components in th eengine compart-
ment coul dbevery hot, e.g. the engine, the radiator and parts of the exhaust system.
There is
arisk of injury when accessing the
engine compartment.
As far as possible, allow the engine to cool
down and only touch the components descri- bed in the following. G
WARNING
There are moving components in the engine
compartment. Certain components may con-
tinue to move or suddenly move again even
after the ignitio nhas been switched off, e.g.
the radiator fan. There is arisk of injury.
If you have to carry out work in the engine
compartment:
R switch off the ignition
R never touch the dangerous area ssurround-
ing moving components, e.g. the rotation
area of the fan
R remove jewellery and watches
R keep items of clothing and hair, for exam-
ple,a wayfrom moving parts. G
WARNING
If engine oil comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is arisk of fire and injury.
Make sure that engine oil does not spil lout
over the filler neck. Allow the engine to cool
downa nd thoroughly clea nthe components
that have come into contact with engine oil
before you start the engine. G
WARNING
If you open the bonnet while the engine is
overheating or while there is afire in the
engine compartment, you coul dcome into
contact with hot gase sorother leaking ser-
vice products. There is adange rofinjury.
Allow an overheating engine to cool down
before opening the bonnet. If there is afire in
the engine compartment, leave the bonnet
closed and notify the fire brigade. 212
Engine compartmentMaintenanc
eand care

The following cause engine failure or damage
to the exhaust system:
R Use of engine oils and oil filters that have
not been expressly approved for the service
system
R Replacement of engine oil and oil filter after
the replacement interval specified by the
service system has expired
R Use of engine oil additives
! Do not add too much oil. If the oil level is
above the "max" mark on the dipstick ,too
much oil has been added. This can lead to
damage to the engine or the catalytic con-
verter .Have excess oil siphoned off. H
Environmental note
When topping up the oil, take care not to spill
any. If oil enters the soil or waterways, it is
harmful to the environment. X
Turn cap :anti-clockwise and remove it.
X Top up with the amount of engine oil required.
Observe the specification sinthe on-board com-
puter when doing so or fill carefully to the max- imum mark on the oil dipstick.
The differenc ebetween the minimum mark and
the maximum mark on the oil dipstick is approx- imately 2.0 litres.
X Replace cap :on the filler neck and turn
clockwise.
Make sure that the cap locks securely into
place.
For further information on engine oil, see
(Y page 252). Other service products
Important safety notes G
WARNING
Certain components in the engin ecompart-
ment coul dbevery hot, e.g. the engine, the
radiator and parts of the exhaust system.
There is arisk of injury when accessing the
engine compartment.
As far as possible,a llow the engine to cool
downa nd only touch the components descri-
bed in the following. G
WARNING
There are moving components in the engine
compartment. Certain components may con-
tinue to move or suddenly move again even
after the ignitio nhas been switched off, e.g.
the radiator fan. There is arisk of injury.
If you have to carry out work in the engine
compartment:
R switch off the ignition
R never touch the dangerous area ssurround-
ing moving components, e.g. the rotation
area of the fan
R remove jewellery and watches
R keep items of clothing and hair, for exam-
ple,a wayfrom moving parts. G
WARNING
The cooling system is pressurised ,particu-
larl yw hen the engine is warm .Ifyou open the
cap, you coul dbescalded if hot coolant
sprays out. There is arisk of injury.
Let the engine cool downb efore you open the
cap. Wearg lovesand eye protection. Open
the cap slowly to release the pressure. G
WARNING
If you open the bonnet while the engine is
overheating or while there is afire in the
engine compartment, you coul dcome into
contact with hot gase sorother leaking ser-
vice products. There is adange rofinjury. 214
Engine compartmentMaintenanc
eand care

Allow an overheating engine to coo
ldown
before opening the bonnet. If ther eisafirein
the engine compartment, leav ethe bonnet
closed and notify the fir ebrigade.
Checkin gthe coolant level Example: checking the coolant level
X Park the vehicl eonalevel surface.
Check the coolant level onl yifthe vehicl eis
on alevel surface and the engine ha scooled
down.
X Turn the key to position 2in the ignition lock
(Y page 96).
X Check the coolant temperatur edisplay in the
instrument cluster.
The coolant temperatur emustbeb elow
70 †.
X Slowl yturnc ap : half aturna nti-clockwise
and allo wexcess pressure to escape.
X Turn cap :furthe ranti-clockwise and
remove it.
If the coolant is at the level of marker bar =
in the fille rneck when cold, there is enough
coolant in coolant expansio ntank ;.
If the coolant level is approximately 1.5 cm
above marker bar =in the fille rneck when
warm, there is enoug hcoolant in coolant
expansio ntank ;.
X If necessary ,top up with coolant tha thas
been teste dand approved by Mercedes-Benz.
X Replace cap :and tur nitclockwise as fa ras
it will go.
Furthe rinformatio noncoolant (Y page 253). Topping up the windscreen washe
rsys-
tem/headlamp cleanin gsystem G
WARNING
If wind screen washer concentrate comes into
contact with hot components of the engine or
the exhaust system, it can ignite. There is a
risk of fire and injury.
Make sure the windscreen washer concen-
trate does not come into contact with the filler neck. Example: topping up the windscreen washer
system
X To open: pull cap:upwards by the tab and
open.
X Top up with the premixed washe rfluid.
X To close: press cap :onto the fille rneck
unti lite ngages.
The washe rfluid reservoi risusedf or both the
windscree nwashe rs ystem and the headlamp
cleaning system.
If the washe rfluid level drops belo wthe recom-
mended minimu mof3.5 litres ,amessage
appear sinthe multifunctio ndisplay prompting
yo utot op up the washe rfluid (Y page 154).
Furthe rinformatio nonwashe rfluid
(Y page 254). Service
ASSYST service interval display
Service messages Yo
uc an obtain up-to-dat einformation concern-
ing the servicin gofyour vehicle from aqualified
specialis tworkshop, e.g. aMercedes-Ben zSer-
vice Centre. Service
215Maintenance and care Z

Do not touch the surfaces or protective films
with hard objects ,e.g.ar ingori ce scraper.
Yo uc ould otherwis escratch or damage the
surfaces and protective film.
! Do not park up your vehicl
efor alon gp eriod
of time immediatel yafter cleaning, particu-
larly after cleaning the whee lrim with wheel
cleaner. Whee lcleane rmaylead to increased
corrosion of the brake discs and pads .You
shoul dtherefore drive for afew minute safter
cleaning. By heating up the brakes ,the brake
discs and pads dry .The vehicl ecan the nbe
parked up for alon gp eriodoft ime. H
Environmental note
Dispose of empty packaging an dcleaning
cloths in an environmentally responsible man- ner.
Regular car eofyour vehicle is acondition for
retainin gqualit yint helongterm.
Use car eproduct sand cleaning agents recom-
mended and approved by Mercedes-Benz. Washin
gthe vehiclea nd cleaning the
paintwork
Automatic car wash G
WARNING
Braking efficiency is reduced after the vehicle has been washed. There is arisk of an acci-
dent.
After washing the vehicle, brake carefully
while paying attention to the traffic conditions in order to restore full braking efficiency.
! When the HOLD function is activated, the
vehicl ebrakes automatically in certain situa-
tions.
To avoi ddamage to the vehicle, deactivate
the HOLD function in the following or similar
situations:
R when towing away
R in ac ar wash
! Make sure that the automatic car washis
suitable for the size of the vehicle. Fold in the exterior mirrors before the vehicl eiswashed.
The exterior mirrors coul dotherwise be dam-
aged. !
Make sure that the automatic transmission
is in position Nwhen washing your vehicle in
at ow-through car wash. The vehicle could be
damagedift he transmission is in another
position.
! Make sure:
R the side windows and sliding sunroof are
closed completely.
R the blower is switched off
R the windscreen wiper switch is at position
0
The vehicle could otherwise be damaged.
You can wash the vehicle in an automatic car
wash from the very start.
If the vehicle is very dirty, wash off excess dirt
before cleaning the vehicle in an automatic car
wash.
After using an automatic car wash, wipe off the
wax from the windscreen and the windscreen
wiper blades. This will prevent smears and
reduce wiping noises caused by residue on the
windscreen.
Washing by hand In some countries, washing by hand is only
allowed at specially equipped washing bays.
Observe the legal requirements for each indi-
vidual country.
When using the vehicle in winter, remove all
traces of road salt deposits carefully and as
soon as possible.
When washing the underside of the vehicle, also
clean the insides of the wheels.
X Do not use hot water and do not wash the
vehicle in direct sunlight.
X Use asoft sponge to clean.
X Use amild cleaning agent, such as acar
shampo oapproved by Mercedes-Benz.
X Thoroughly hose down the vehicle with agen-
tle jet of water.
X Do not point the water jet directly towards the
air inlet.
X Use plenty of water and rinse out the sponge
frequently.
X Rinse the vehicle with clean water and dry
thoroughl ywithachamois.
X Do not let the cleaning agent dry on the paint-
work. Ca
re
217Maintenance an dcare Z