2018 MERCEDES-BENZ G-CLASS SUV Owners Manual

#
Only use battery charge rs with a maxi‐
mum charging voltage of 14.8 V. &
WARNING Risk ofexplosion from hydro‐
ge nga s igniting
A battery generates hydrogen gas during the
ch arging process. If there is a short circuit or
spar ksstart toform ,th ere is a danger of the
hy drogen gas igniting. #
Make sure that the positive term inal of
th e connected battery does not come
into conta ct withvehicle parts. #
Never place me tal objects or tools on a
batter y. #
When connecting and disconnecting the
batter y,yo u must obse rveth e descri‐
bed order forth e battery clamps. #
When giving starting assis tance, al ways
make sure that you on lyconnect bat‐
te ry term inals with identical polarity. #
During starting assis tance, you must
obse rveth e described order for con‐ necting and disconnecting
the jump
lead. #
Do not connect or disconnect the bat‐
te ry cla mp s while the engine is running. &
WARNING Risk ofexplosion during
ch arging process and starting assis tance
During thech arging process and starting
assis tance, the battery may release an explo‐
sive gas mixture. #
Avoid fire , naked flames, creating
spar ksand smoking. #
Make sure that there is suf ficient venti‐
lation du ring thech arging process and
during starting assis tance. #
Do not lean over a batter y. &
WARNING Risk ofexplosion from a fro‐
zen battery
A dischar ged battery may freeze at temp era‐
tures slightly abo veor below freezing point. During
starting assis tance or battery charg‐
ing, bat tery gas may be released. #
Alw aysth aw a frozen bat tery out first
before charging it or per form ing start‐
ing assis tance. If
th e indicator/warning lamps in the instrument
clus ter do not light up at low temp eratures, it is
ve ry likely that the dischar ged battery has fro‐
zen. In this case you may neither jump-s tart the
ve hicle nor charge the batter y.
The service life of a battery that has been
th awe d may be dramatically shor tened. The
st arting characteristics may be impaired, espe‐
cially at low temp eratures.
It is recommended that you ha veathaw ed bat‐
te ry checked at a qualified specialist workshop.
* NO
TEDama gecaused bynumerous or
ex tended attem ptsto start the engine Nume
rous or extended attem ptsto start the
engine may damage the catalytic con verter
due tonon-combu sted fuel. 398
Breakdown assis tance

#
Avoid numerous and extended attem pts
to start the engine. Obser
vethefo llowing points during starting
assis tance and when charging the battery:
R Only use undamaged jump lead/charging
cables with a suf ficient cross-section and
insula tedte rm inal clamps.
R Non- insulated parts of thete rm inal clamps
must not come into con tact wi thother me tal
parts while the jump lead/charging cable is
connected tothe battery/jump-s tart connec‐
tion point.
R The jump lead/charging cable must not
come into contact wi thany parts which may
mo vewhen the engine is running.
R Alw ays make sure that nei ther you nor the
battery is elect rostatically charge d.
R Keep away from fire and naked flames.
R Do not lean overth e batter y. Obser
vethe additional following points when
ch arging the battery:
R Only use battery charge rs tested and
appr oved for Mercedes-Benz.
R Read the battery charge r's operating instruc‐
tions before charging the batter y.
Obser vethe additional following points during
st arting assis tance:
R Starting assis tance may be pe rformed using
only batteries with a nominal voltage of 12V.
R The vehicles must not touch.
R Petrol engine: only acceptstarting assis‐
ta nce if the engine and exhaust sy stem are
cold. St
arting assi stance and charging the12 V
battery Requ
irements:
R The vehicle is secured with the electric park‐
ing brake.
R The transmission is in position j.R
The ignition and all electrical consumers are
switched off.
R The bonn etis open. #
Slide co ver1 of positive clamp 2onthe
jump-s tarting connection point in the direc‐
tion of the ar row. #
Connect positive clamp 2onyour vehicle to
th e positive pole of the donor battery using Breakdown assis
tance 399

th
e jump lead/charging cable. Alw ays begin
with positive clamp 2onyour ow nve hicle
fi rs t. #
During starting assi stance: start the
engine of the donor vehicle and run at idle
speed. #
Connect the negative pole of the donor bat‐
te ry and ear thpoint 3ofyour ow nve hicle
by using the jump lead/charging cable. Begin
with the donor battery firs t. #
During starting assi stance: start the
engine of your ow nve hicle. #
During thech arging process: start the
ch arging process. #
During starting assi stance: letthe engines
ru nfo r se veral minutes. #
During starting assi stance: before discon‐
necting the jump lead, switch on an electrical
consumer in your ow nve hicle, e.g. there ar
wind owheater or lighting.
When thest arting assis tance/charging process
is compl ete: #
First,re mo vethe jump lead/charging cable
from ear thpoint 3and negative pole of the
donor batter y,then from positive clamp 2
and positive pole of the donor batter y.Begin
ea ch time wi th the conta cts onyour own
ve hicle firs t. #
Afterre moving the jump lead/charging
cable, close co ver1 of positive clamp 2.
Fu rther information can be obtained at a quali‐
fi ed specialist workshop. Re
placing the 12V battery #
Obser vethe no tes on the12 V battery
(/ page 396).
Mercedes-Benz recommends that you ha vethe
12 V battery replaced at a qualified specialist
wo rkshop, e.g. at a Mercedes-Benz Service
Centre. Obser
vethefo llowing no tes if youwa ntto
re place the battery yourself:
R Alw aysre place a faulty bat tery with a battery
which meets the specific vehicle require‐
ments.
The vehicle is equipped with an AGMtech nol‐
ogy battery (Absorbent Glass Mat). Fullve hi‐
cle functionality is only guaranteed with an
AG M batter y.Fo r saf etyre asons, Mercedes-
Benz recommends that you on lyuse bat ter‐
ies which have been tested and appr ovedfor
yo ur vehicle byMercedes-Benz.
R Carryover de tach able parts, such as vent
hoses, elbow fittings or term inal co vers from
th e battery being replaced.
R Make sure that theve nt hose is al ways con‐
nected tothe original opening on the side of
th e batter y.
Fit any existing or supplied cell caps.
Otherwise, gases or battery acid could
escape.
R Make sure that de tach able parts are recon‐
nected in the same way. 400
Breakdown assis tance

To
w- starting or towing away Pe
rm itted towing me thods Mercedes-Benz
recommends transporting your
ve hicle in the case of a breakdown, rath er than
to wing it away.
Fo rto wing, use a tow rope or tow bar with bo th
axles on the ground. Do not use tow bar sys‐
te ms. *
NO
TEDama getotheve hicle due to tow‐
ing away incor rectly #
Obser vethe instructions and no tes on
to wing away. %
Ifyo uto w theve hicle with raised front or
re ar axles, you must remo vethe propeller shaft between
the transfer case and thero ll‐
ing axles.
Pe rm itted towing me thods Bo
th axles on thegr ound Fr
ont axle raised Re
ar axle raised
Ye s, maximum 50 km at 50 km/h YesY esTo
wing theve hicle with bo thaxles on the
gr ound #
Obser vethe no tes on the permitted towing
me thods (/ page 401). #
Make sure that the battery is connected and
ch arge d.
When the battery is dischar ged:
R the engine cann otbe star ted. R
the electric parking brake cann otbe released
or applied.
R the transmission cann otbe shif tedto posi‐
tion iorj. Breakdown assis
tance 401

%
Ifth e transmission cann otbe shif tedto posi‐
tion i, transport theve hicle (/ page 404).
A towing vehicle with lifting equipment is
requ iredforve hicle transpor tation.
* NO
TEDama gedue to to wing away at
exc essively high speeds or over long dis‐
ta nces The driv
etra in could be damaged when tow‐
ing at excessively high speeds or over long
dis tances. #
Atowing speed of 50 km/h must not
be exc eeded. #
Atowing dis tance of 50 km must not be
exc eeded. &
WARNING Risk of accident when towing
a ve hicle which is too heavy
If th eve hicle being tow- star ted or towed
aw ay is heavier than the permissible gross
mass, thefo llowing situations can occur:
R theto wing eye may become de tach ed. R
the car/t railer combination may swer ve
or eve nove rturn. #
If ano ther vehicle is tow- star ted or
to we daw ay, its weight must not exceed
th e permissible gross mass of your own
ve hicle. If a
vehicle must be tow- star ted or towe daw ay,
its permissible gross mass must not exceed the
permissible gross mass of theto wing vehicle. #
Information on the permissible gross mass of
th eve hicle can be found on theve hicle iden‐
tification plate (/ page 427). #
Do not open the driver's door or front
passenger door, otherwise the transmission
automatically shifts toposition j. #
Fasten theto w bar totheto wing eyes.
* NO
TEDama gedue toincor rect connec‐
tion #
Only connect theto w rope or tow bar to
th eto wing eyes. #
Deactivate the automatic locking mecha‐
nism . #
Do not activate the HOLD function. #
Deactivate theto w- aw ay protection
(/ page 86). #
Deactivate Active Brake Assi st
( / page 185). #
Shift the transmission toposition i. #
Release the electric parking brake. &
WARNING Risk of accident due tolimi‐
te d saf ety-re lated functions during the
to wing process
Saf ety-re lated functions are limited or no lon‐
ge rav ailable in thefo llowing situations:
R the ignition is switched off.
R the brake sy stem or po werst eering sys‐
te m is malfunctioning.
R the energy supply or the on-board electri‐
cal sy stem is malfunctioning. 402
Breakdown assis tance

When
your vehicle is then towe daw ay, signif‐
icantly more ef fort may be requ ired tosteer
and brake than is no rmally requ ired. #
Use a tow bar. #
Make sure that thesteering wheel can
mo vefreely, before towing theve hicle
aw ay. *
NO
TEDama gedue toexcessive tracti ve
po wer If
yo u pull away sharpl y,the tractive po wer
may be too high and theve hicles could be
damaged. #
Pull away slowly and smoo thly. Note
s onreco vering a vehicle that is stuck *
NO
TEDama geas a result of reco vering a
ve hicle that is stuck If
th e tractive po wer is too high, theve hicles
could be damaged. #
Pull theve hicle that is stuck out as
st ra ight and evenly as possible du ring
re co very. Obser
vethefo llowing during reco very to avo id
damage to yourvehicle:
R ifth e driven wheels get trapped on loose or
muddy ground, reco verth eve hicle with the
utmost care,
especially so if theve hicle is laden.
R never attem pttoreco ver a vehicle that is
st uck with a trailer attached.
R pull out theve hicle that is stuck backwards,
if possible, using the trac ksit made before it
became stuc k. To
wing vehicle away intheeve nt of malfunc‐
tions Note
s ontowing away intheeve nt of mal‐
functions
* NO
TEDama gedue toincor rect attach‐
ment and use of old nuts The
vehicle and components of theve hicle
can be damaged due toincor rect attachment
and use of old nuts. #
Ifyo ure mo vethe propeller shaft, place
th e M10 nuts on the M8 bolts as
spacers and secure them with M8 nuts. #
Alw ays use new self-locking nuts when
ins talling the propeller shafts. Obser
vethe no tes on towing away
( / page 401).
% For fur ther information, consult a Mercedes-
Benz Service Centre. Breakdown assis
tance 403

To
wing away intheev ent of malfunctions
To wing away intheev ent of dama getothe
engine, transmission or electrics #
Shift the transmission toposition i.
To wing away intheev ent of transfer case
dama ge #
Remo vethe propeller shafts between the
axles and the transfer case.
To wing away intheev ent of front axle dam‐
age #
Remo vethe propeller shaft between there ar
axle and the transfer case. #
Tow aw ay theve hicle with a raised front axle.
To wing away intheev ent of rear axle dam‐
age #
Remo vethe propeller shaft between the front
axle and the transfer case. #
Tow aw ay theve hicle with a raised rear axle
and with wheel rollers under the front axle. Loading
theve hicle for transport #
Obser vethe no tes on towing away
( / page 401). #
Connect theto w bar totheto wing eye in
order toload theve hicle. #
Shift the transmission toposition i.
% The automatic transmission may be loc ked
in position jintheeve nt of dama getothe
electrics. Toshift toi , pr ovide the on-
board electrical sy stem with po wer
( / page 399). #
Load theve hicle onto the transpor ter. #
Shift the transmission toposition j. #
Use the electric parking brake tosecure the
ve hicle against rolling away. #
Only secure theve hicle bythe wheels. #
Make sure that the front and rear axles come
to rest on the same transpor tation vehicle.
* NO
TEDama getothe driv etra in due to
incor rect positioning #
Do not position theve hicle abo vethe
connection point of the transport vehi‐
cle. 404
Breakdown assis tance

Po
sition of towing eyes The
towing eyes 1 are attached tothe front
and rear of theve hicle. To
w- starting theve hicle (eme rgency engine
st art) *
NO
TEDama getothe automatic trans‐
mission due to tow-starting The automatic transmission may be damaged
in the process of tow- starting vehicles with
automatic transmission. #
Vehicles with automatic transmission
must not be tow- star ted. #
Do not tow- start theve hicle. Electrical fuses
Note
s on electrical fuses &
WARNING Risk of accident and inju ry
due to ov erloaded lines
If yo u manipulate or bridge a faulty fuse or if
yo ure place it with a fuse with a higher
amperage, the electric line could be overloa‐
ded.
This could result in a fire. #
Alw aysre place faulty fuses with speci‐
fi ed new fuses conta iningthe cor rect
amperage. *
NO
TEDama gedue toincor rect fuses Electrical components or sy
stems may be
damaged byincor rect fuses, or their func‐
tionality may be significant lyimpaired. #
Only use fuses that ha vebeen appr oved
by Mercedes-Benz and which ha vethe
cor rect fuse rating. Blown fuses mu
stbe replaced with fuses of the
same rating, which you can recognise bythe col‐
our and fuse rating. The fuse ratings and fu rther
information tobe obser ved are lis ted in the fuse
assignment diagram.
Fu se assignment diag ram: onthe fuse box in
th ere ar passenger compartment (/ page 407). Breakdown assis
tance 405