service MERCEDES-BENZ G-CLASS SUV 2012 Service Manual

G
WARNING
A discharged battery can freeze at tempera-
tures below freezing point. When jump-start-
ing the vehicle or charging the battery, gases
can escape from the battery .There is a risk of
an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting.
! Only charge the installed battery with a
battery charger which has been tested and
approved by Mercedes-Benz. These battery
chargers allow the battery to be charged
while still installed in the vehicle.
! Only use battery chargers with a maxi-
mum charging voltage of 14.8 V.
! Only charge the battery using the jump-
start connection point.
Never charge a battery still installed in the
vehicle unless a battery charger unit
approved by Mercedes-Ben zis being used.
Ab attery charge runit specially adapted for
Mercedes-Benz vehicles and tested and
approved by Mercedes-Benz is available as an
accessory .Itpermits the charging of the bat-
tery in its installed position .Contact a
Mercedes-Benz Service Centre for informa-
tion and availability. Charge the battery in
accordance with the separate instructions for
the battery charger.
The jump-starting connection point is in the
engine compartment (Y page 313).
Read the battery charger's operating instruc-
tions before charging the battery.
X Open the bonnet (Y page 291).
X Connect the battery charger to the positive
terminal and earth point in the same order
as when connecting the donor battery in
the jump-starting procedure
(Y page 313). 312
Battery (vehicle)Breakdown assistance

Do not use a rapid charging device to start the vehicle.
Make sure the jump leads are not damaged.
Make sure the jump leads are not touching any other metal objects when they are connected
to the battery.
If the indicator/warning lamps do not ligh tup at temperatures around or below freezing point,
the discharged battery is likely to be frozen (a commonplace scenario). In this case, do not
jump-start the vehicle or recharge the battery.
Once the battery has thawed out, its service life may be dramatically reduced.
The starting characteristic scan be impaired, particularly at low temperatures.
It is recommended that you have the thawed out battery checked at a qualified specialist
workshop.
Do no tuse a rapid charging device to start the vehicle. If your vehicle's battery is discharged,
the engine can be jump-started from another vehicle or from a second battery using jump
leads. Observe the following points:
R The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible,
jump-start the vehicle using a second battery or ajump-starting device.
R Vehicles with apetrol engine: only jump-star tthe vehicle when the engine and exhaust
system are cold.
R Do not start the engine if the battery is frozen. Let the battery thaw first.
R Jump-starting may only be performed from batteries with a nominal voltage of 12 V.
R Only use jump leads that have a sufficient cross-section and insulated terminal clamps.
R If the battery is fully discharged, leave the battery that is being used to jump-start connected
for a few minutes before attempting to start. This charges the empty battery a little.
R Make sure that the two vehicles do not touch.
Make sure that:
R The jump leads are not damaged.
R Non-insulated parts of the terminal clamps do not come into contact with other metal parts
while the jump leads are connected to the battery.
R The jump leads cannot come into contact with parts such as the pulley or the fan. These
parts move when the engine is started and while it is running.
X Apply the parking brake.
X Move the selector lever to P.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the bonnet (Y page 291).314
Jump-startingBreakdown assistance

X
Observe the safety notes as you do so
(Y page 315).
i Consult a Mercedes-Benz Service Centre.
Engine damage, gear damage or electri-
cal faults X
Move the selector lever to posi-
tion N(Y page 149).
X Shift the transfer case to neu-
tral (Ypage 203).
In the event of damage to the transfer
case Have the propellers
hafts between the axles
and the transfer case removed.
In the event of damage to the front axle Have the propeller shaft between the rear
axle and the transfer case removed.
Have the vehicle towed with the front axle
raised.
In the event of damage to the rear axle
Have the propeller shaft between the front
axle and the transfer case removed.
Then, have the vehicle towed with the rear
axle raised and with wheel rollers under the
front axle.
Electrical fuses
Important safety notes
G
WARNING
Only use fuses that have been approved for
Mercedes-Ben zvehicles and which have the
correct fuse rating for the systems con-
cerned. Do not attempt to repair or bridge
faulty fuses. Using fuses which have not been
approved or attempting to repair or bridge
faulty fuses could cause the fuse to be over-
loaded and result in a fire. Have the cause traced and rectified at a qualified specialist
workshop.
! Only use fuses that have been approved
for Mercedes-Benz vehicles and which
have the correct fuse rating for the system
concerned. Otherwise, components or sys-
tems could be damaged.
The fuses in your vehicle serve to disconnect
faulty circuits. If afuse blows, all the compo-
nents on the circuit and their functions will
fail.
Blown fuses must be replace dwith fuses of
the same rating, which you can recognise by
the colour and fuse rating. The fuse ratings
are listed in the fuse allocation chart.
If the newly inserted fuse also blows, have the
cause traced and rectified at a qualified spe-
cialist workshop, e.g. a Mercedes-Benz
Service Centre. Before replacing a fuse
X Park the vehicle and apply the parking
brake.
X Switch off all electrical consumers.
X Remove the key from the ignition lock.
All indicator lamps in the instrumen tcluster
must be off.
The fuses are located in various fuse boxes:
R Main fuse box on the driver's side of the
dashboard
R Fuse box in the front-passenger footwell
R Fuse box in the transmission tunnel
R Fuse box in the battery case
The fuse allocation char tand the spare fuses
are in the main fuse bo xonthe dashboard
(Y page 319).
You will find the fuse removal device in the
vehicle tool kit (Y page 306).318
Electrical fusesBreakdown assistance

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. Country-specific differen-
ces are possible. Note that your vehicle
may not be fitted with all features 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 22). Important safety notes
G
Warning
Af lat tyre severely impairs the driving, steer-
ing and braking characteristics of the vehicle.
There is a risk of an accident.
Do not drive with a flat tyre. Immediately
replace the flat tyre with your spare wheel, or
consult a qualified specialist workshop. G
WARNING
Tyres, wheels or accessories which have not
been approved by Mercedes-Ben zfor your
vehicle, or are not used as they should be, can
impair driving safety. As a result, you could
cause an accident .Before purchasing and
using them, enquire about their suitability,
legal stipulations and factory recommenda-
tions at a Mercedes-Benz Service Centre.
Accessories that are not approved for your
vehicle by Mercedes-Benz or are not being
used correctly can impair the operating
safety.
Before purchasing and using non-approved
accessories, visit a qualified specialist work-
shop and enquire about:
R suitability
R legal stipulations
R factory recommendations Information on the dimensions and types of
wheels and tyres for your vehicle can be
found in the "Wheel/tyre combinations" sec-
tion (Y
page 333).
Information on air pressure for the tyres on
your vehicle can be found:
R on the tyre pressure label on the fuel filler
flap
R in the "Tyre pressure" section
Modification work on the brake system and
wheels is not permitted, nor is the use of
spacer plates or brake dust shields. This inva-
lidates the general operating permit for the
vehicle.
i Further information on wheels and tyres
can be obtained at any qualified specialist
workshop. Operation
Notes on driving
Check the tyre pressures when the vehicle is
heavily laden and, if necessary, adjust.
While driving, pay attention to vibrations,
noises and unusual handling characteristics,
e.g. pulling to one side. This may indicate that
the wheels or tyres are damaged. If you sus-
pect that a tyre is defective, reduce your
speed immediately. Stop the vehicle as soon
as possible to chec kthe wheels and tyres for
damage. Hidden tyre damage could also be
causing the unusual handling characteristics.
If you find no signs of damage, have the tyres
and wheels checked at a specialist workshop.
When parking your vehicle, make sure that
the tyres do not get deformed by the kerb or
other obstacles. If it is necessary to drive over
kerbs, speed humps or similar elevations, try
to do so slowly and at an obtuse angle. Oth-
erwise, the tyres, particularly the sidewalls,
may be damaged. 322
OperationWheels and tyres

Regular checking of wheels and tyres
R Regularly check the wheels and tyres of
your vehicle for damage at leas tevery 14
days, as well as after driving off-road or on
rough roads. Damage includes cuts, punc-
tures, cracks and bulges on tyres or severe
corrosio nordeformation on wheels, for
example. Damaged wheels can cause a
loss of tyre pressure.
R Regularly chec kthe tyre tread depth and
the condition of the tread across the whole
width of the tyre (Y page 323). In order to
inspect the inner side of the tyre surface,
turn the steering wheel to full lock.
R All wheels must have a valve cap to protect
the valve against dirt and moisture. Do not
fit anything onto the valve other than the
standard valve cap or avalve cap approved
by Mercedes-Ben zfor your vehicle.
Do not fit anything onto the valve, such as
tyre pressure monitoring systems.
R You should regularly check the pressure of
all your tyres including the spare wheel,
particularly prior to long trips. Adjust the
tyre pressure as necessary (Y page 328).
The service life of tyres depends on various
factors, including the following:
R driving style
R tyre pressure
R tyre mileage Tyre tread
G
WARNING
Please keep in mind that:
R tyre grip decreases rapidly on wet roads
when the tread depth is less than 3mm.
Thus, you should replace tyres that have
insufficient tread.
R winter tyres should be replaced when the
tread depth is 4mmorless, as they no lon-
ger provide adequate grip.
R the tread on a tyre may not wear evenly.
Thus, you should regularly check the tread depth and the condition of the tread across
the entire width of all tyres. If necessary,
turn the fron
twheels to full lock in order to
inspect the tyre tread more easily.
Otherwise, you could lose control of the vehi-
cle and cause an accident due to the reduced
grip of the tyres on the road. Selecting, fitting and replacing tyres
R Only fit tyres and wheels of the same type
and make.
R Only fit approved tyres of the correct size
onto the wheels.
R Tyres are supplied with a protective layer
from the factory. Run in new tyres at mod-
erate speeds for the first 100 km. They only
reach their full performance after this dis-
tance.
R Do not drive with tyres which have too little
tread depth. This otherwise significantly
reduces the traction on wet roads (aqua-
planing).
R Replace the tyres after six years at the lat-
est, regardless of wear. This also applies to
the spare wheel. Winter operation
General notes
Have your vehicle winterproofed at a qualified
specialist workshop at the onset of winter.
Observe the notes in the "Changing a wheel"
section (Y page 329). Driving with summer tyres
At temperatures below +7 †, summer tyres
lose elasticity and therefore traction and
braking power. Change the tyres on your vehi-
cle to M+S tyres. Using summer tyres at very
cold temperatures could cause tears to form,
thereby damaging the tyres permanently. Winter operation
323Wheels and tyres Z

Mercedes-Ben
zcannot accept responsibility
for this type of damage. M+S tyres
G
WARNING
M+S tyres with a tyre tread depth of less than
4mma re not suitable for use in winter as they
do not provide sufficient traction. There is a
risk of accident.
M+S tyres with a tread depth of less than
4 mm must be replaced. G
WARNING
The spare wheel and M+S tyres have different
tyre characteristics. Driving characteristics
can be severely impaired when you fit the
spare wheel. There is a risk of an accident.
You should therefore adapt yourd riving style
and drive carefully.H ave the spare wheel
replaced with a new wheel with an M+S tyre
at the nearest qualified specialist workshop.
At temperatures below +7 †, use winter tyres
or all-season tyres. Both types of tyre are
identified by the M+S marking.
Only winter tyres bearing the isnowflake
symbol in addition to the M+S marking pro-
vide the best possible grip in wintry road con-
ditions. Only these tyres will allow driving
safety systems such as ABS and ESP ®
to
function optimally in winter, as these tyres
have been designed specifically for driving on
snow.
Use M+S tyres of the same make and tread
on all wheels to maintain safe handling char-
acteristics.
Always observe the maximum permissible
speed specified for the M+S tyres you have
fitted.
If you fit M+S tyres that have a lower maxi-
mum permissible speed than that of the vehi-
cle, affix an appropriate warning sign in the
driver's field of vision .This can be obtained
at a qualified specialist workshop. Under these circumstances, you should also
restrict the maximum speed of the vehicle
using variable SPEEDTRONIC so that it does
not exceed the maximum permissible speed
for the M+S tyres(Y
page 178).
When you have fitted the M+S tyres:
X Check the tyre pressures (Y page 327).
X Restart the tyre pressure monitor
(Y page 328).
i You can obtain information about winter
tyres that have been approved by
Mercedes-Ben zespecially for your vehicle
at any Mercedes-Benz Service Centre.
i For further information about tyres, see
(Y page 333). Snow chains
! Information aboutt he use of snow chain
compatible AMG winter tyres is applicable
for AMG tyres. Use of snow chains is only
permissible with these tyres.
For safety reasons, Mercedes-Ben zrecom-
mends that you only use snow chains that
have been specially approved for your vehicle
by Mercedes-Benz, or that are of a corre-
sponding standard of quality.
R only use snow chains when the road sur-
face is completely snow-covered. Remove
the snow chains as soon as possible when
you come to road that is not snow-covered.
R local regulations may restrict the use of
snow chains. Observe the appropriate reg-
ulations if you wish to fit snow chains.
R Do not exceed the maximum permissible
speed of 50 km/h.
If you intend to fit snow chains, please bear
the following points in mind:
R snow chains cannot be fitted to all wheel/
tyre combinations (Y page 62).
R fit the snow chains on all four wheels for
maximum tractive power and driving sta-
bility. Observe the manufacturer's fitting
instructions. 324
Winter operationWheels and tyres

Tyre pressure table
If a tyre size precedes a tyre pressure, the tyre
pressure informatio
nfollowing is only valid
for that tyre size. Instead of the complete tyre size, the rim
diameter alone, for example
R16, may be lis-
ted. Rim diameter
:is part of the tyre size and
can be found on the tyre sidewall.
Use a suitable pressure gauge to check the
tyre pressure. The outer appearance of a tyre
does not permit any reliable conclusion about
the tyre pressure.
On vehicles fitted with the electronic tyre
pressure monitor, the tyre pressure can be
checked using the on-board computer.
If possible, only correc ttyre pressures when
the tyres are cold.
The tyres are cold:
R if the vehicle has been parked with the tyres
out of direc tsunlight for at least three
hours and
R if the vehicle has no tbeen driven further
than 1.6 km
Depending on the ambient temperature, the
speed you are driving at and the load on the
tyres, the tyre temperature and thus the tyre
pressure change by approximately 10 kPa
(0.1 bar/1.5 psi) per 10 †. Take this into
accoun twhen checking the pressure of warm
tyres. Only correct the tyre pressure if it is too
low for the current operating conditions.
Driving with tyre pressure that is too high or
too low can:
R shorten the service life of the tyres
R cause increased tyre damage
R have a negative effect on handling charac-
teristics and thus the driving safety (e.g.
aquaplaning) 326
Tyre pressureWheels and tyres

X
Stow the jack and the vehicle tools in the
vehicle again.
X Check the tyre pressure of the newly fitted
wheel and adjus titifnecessary.
You will find a table of tyre pressures on the
inside of your vehicle's fuel filler flap. Wheel and tyre combinations
General notes
! For safety reasons, Mercedes-Benzr ec-
ommends that you only use tyres, wheels
and accessories which have been approved
by Mercedes-Benzs pecifically for your
vehicle. These tyres have been specially
adapted for use with the driving safety sys-
tems, such as ABS or ESP ®
.
Only use tyres, wheels or accessories tes-
ted and approved by Mercedes-Benz .Cer-
tain characteristics, e.g. handling, vehicle
noise emissions or fuel consumption, may
otherwise be adversely affected. In addi-
tion, when driving with aload, tyre dimen-
sion variations could cause the tyres to
come into contact with the bodywork and
axle components.T his could result in dam-
age to the tyres or the vehicle.
Mercedes-Ben zaccepts no liability for
damage resulting from the use of tyres,
wheels or accessories othe rthan those tes-
ted and approved.
Further information about wheels, tyres
and approved combinations can be
obtained from any Mercedes-Benz Service
Centre.
! Large wheels: the lower the section width
for a certain wheel size, the lower the ride
comfort is on poor road surfaces. Roll com-
fort and suspension comfort are reduced
and the risk of damage to the wheels and
tyres as a result of driving over obstacles
increases.
i You will find a table of tyre pressures on
the inside of your vehicle's fuel filler flap. For further information on tyre pressure,
see (Y
page 325). Check tyre pressures
regularly and only when the tyres are cold.
i Notes on the vehicle equipment –always
fit the vehicle:
R with tyres of the same size on a given axle
(left/right)
R fit the same type of tyres on your vehicle
at a given time (summer tyres, winter
tyres, all-weather tyres, All Terrain tyres)
The tyre and wheel combinations listed in the
tables below apply to the following models: V1 G 500
V2 G 350 BlueTEC
V3 G 63 AMG
G 65 AMG
i
Not all wheel/tyre combinations can be
mounted at the factory in all countries. Tyres
G3 50 BlueTEC Summer tyres
Tyres Light-alloy
wheels
265/60 R18 109 H
Tyre manufacturer
recommended by
Mercedes-Benz:
Bridgestone. 7.5
Jx18 H2 ET 63 i
You can obtai ninformation abou ttyres
and tyre dimensions that are no tlisted here
at any Mercedes-Benz Service Centre. Wheel and tyre combinations
333Wheels and tyres Z

All-weather tyres
Tyres Light-alloy
wheels
265/70 R16 112 H
M+S
Tyre manufacturer
recommended by
Mercedes-Benz:
Bridgestone. 7.5J x 16 H2 ET 63
265/60 R18 110 V
M+S
Tyre manufacturer
recommended by
Mercedes-Benz: Yoko-
hama. 7.5J x 18 H2 ET 63
i
You can obtain information about tyres
and tyre dimensions that are no tlisted here
at any Mercedes-Benz Service Centre.
Spare wheel
! The spare wheel must be inflated to the
maximum tyre pressure given in the table
on the inside of the fuel filler flap. Tyres Light-alloy
wheels
265/60 R18 110 V
M+S
Tyre manufacturer
recommended by
Mercedes-Benz: Yoko-
hama. 7.5J x 18 H2 ET 63
i
You can obtain information about tyres
and tyre dimensions that are not listed here
at any Mercedes-Benz Service Centre. G5
00 Summer tyres
Tyres Light-alloy
wheels
265/60 R18 109 H
Tyre manufacturer
recommended by
Mercedes-Benz:
Bridgestone. 7.5
Jx18 H2 ET 63 i
You can obtai ninformation abou ttyres
and tyre dimensions that are no tlisted here
at any Mercedes-Benz Service Centre.
All-weather tyres Tyres Light-alloy
wheels
265/70 R16 112 H
M+S
Tyre manufacturer
recommended by
Mercedes-Benz:
Bridgestone. 7.5J x 16 H2 ET 63
265/60 R18 110 V
M+S
Tyre manufacturer
recommended by
Mercedes-Benz: Yoko-
hama. 7.5J x 18 H2 ET 63
i
You can obtain information about tyres
and tyre dimensions that are not listed here
at any Mercedes-Benz Service Centre.
Spare wheel
! The spare wheel must be inflated to the
maximum tyre pressure given in the table
on the inside of the fuel filler flap. 334
Wheel and tyre combinationsWheels and tyres

Tyres Light-alloy
wheels
265/60 R18 110 V
M+S
Tyre manufacturer
recommended by
Mercedes-Benz: Yoko-
hama. 7.5J x 18 H2 ET 63
i
The spare wheel matches the standard
tyres.
i You can obtai ninformation abou ttyres
and tyre dimensions that are no tlisted here
at any Mercedes-Benz Service Centre.
G 63 AMG Summer tyres
Tyres Light-alloy
wheels
275/50 R20 113
WXL
Use of snow chains
not permitted.
Tyre manufacturer
recommended by
Mercedes-Benz:Y oko-
hama. 9.5Jx20 H2 ET 50
i
You can obtai ninformation abou ttyres
and tyre dimensions that are no tlisted here
at any Mercedes-Benz Service Centre.
Winter tyres Tyres Light-alloy
wheels
265/55 R19 109H
M+S
Tyre manufacturer
recommended by
Mercedes-Benz: Dun-
lop. 9.5J x 19 H2 ET 50 i
You can obtain information about tyres
and tyre dimensions that are not listed here
at any Mercedes-Benz Service Centre.
Spare wheel
! The spare wheel must be inflated to the
maximum tyre pressure given in the table
on the inside of the fuel filler flap. Tyres Light-alloy
wheels
265/55 R19 109H
M+S
Tyre manufacturer
recommended by
Mercedes-Benz: Dun-
lop. 9.5J x 19 H2 ET 50
i
You can obtain information about tyres
and tyre dimensions that are not listed here
at any Mercedes-Benz Service Centre.
G 65 AMG Summer tyres
Tyres Light-alloy
wheels
275/50 R20 113
WXL
Use of snow chains
not permitted.
Tyre manufacturer
recommended by
Mercedes-Benz:Y oko-
hama. 9.5Jx20 H2 ET 50
i
You can obtai ninformation abou ttyres
and tyre dimensions that are no tlisted here
at any Mercedes-Benz Service Centre. Wheel and tyre combinations
335Wheels and tyres Z