warning lights MERCEDES-BENZ G-CLASS 2018 User Guide
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Page 58 of 294

Problems with the BabySmart™ air bag deactivation system
ProblemPossible causes/consequences andMSolutions
The PASSENGER AIR
BAG OFF indicator lamp
on the center console is
lit.A special Mercedes-Benz child restraint system with a transponder for
the BabySmart™ air bag deactivation system has been installed on the
front-passenger seat. The front-passenger air bag has therefore been
deactivated as desired.
GWARNING
There is no child restraint system installed on the front-passenger
seat. The BabySmart™ air bag deactivation system is malfunctioning,
for example due to electronic devices on the front-passenger seat.
There is a risk of injury.
XRemove electronic equipment from the front-passenger seat, for
example:
RLaptop
RMobile phone
RCard with a transponder, such as a ski pass or access pass
If the PASSENGER AIR BAG OFF indicator lamp remains lit, the front-
passenger seat may not be used.
XVisit a qualified specialist workshop.
When you switch the
ignition on, the 6
restraint system warning
lamp lights up and/or
the PASSENGER AIR
BAG OFF indicator lamp
does not light up briefly.GWARNING
The BabySmart™ air bag deactivation system is malfunctioning.
Do not install a child restraint system on the front-passenger seat.
It is recommended that you install the child restraint system on a
suitable rear seat.
XVisit a qualified specialist workshop.
XPlease also refer to the notes about the restraint system warning
lamp (Ypage 198).
Child-proof locks
Important safety notes
GWARNING
If children are traveling in the vehicle, they
could:
Ropen doors, thus endangering other people
or road users
Rexit the vehicle and be caught by oncoming
traffic
Roperate vehicle equipment and become
trapped
There is a risk of an accident and injury.
Always activate the child-proof locks and
override feature if children are traveling in the vehicle. When leaving the vehicle, always take
the key with you and lock the vehicle. Never
leave children unattended in the vehicle.
Override feature for:
Rthe rear doors (Ypage 57)
Rthe rear side windows (Ypage 57)
56Children in the vehicle
Safety
Page 60 of 294

As a result, they could:
Ractivate vehicle equipment and become
trapped, for example
Ractivate or deactivate systems, thereby
endangering other road users
Unsecured animals could also be flung around
the vehicle in the event of an accident or sud-
den steering or braking, thereby injuring vehi- cle occupants. There is a risk of an accident
and injury.
Never leave animals unattended in the vehi-
cle. Always secure animals properly during
the journey, e.g. use a suitable animal trans-
port box.
Driving safety systems
Overview of driving safety systems
In this section, you will find information about
the following driving safety systems:
RABS ( Anti-lock Braking System)
(Ypage 58)
RBAS ( Brake Assist System) (Ypage 59)
RESP®(E lectronic StabilityProgram)
(Ypage 59)
REBD ( Electronic Brake force Distribution)
(Ypage 61)
RADAPTIVE BRAKE (Ypage 61)
Important safety notes
If you fail to adapt your driving style or if you are
inattentive, the driving safety systems can nei-
ther reduce the risk of an accident nor override
the laws of physics. Driving safety systems are
merely aids designed to assist driving. You are
responsible for maintaining the distance to the
vehicle in front, for vehicle speed, for braking in good time, and for staying in lane. Always adapt
your driving style to suit the prevailing road and weather conditions and maintain a safe distance
from the vehicle in front. Drive carefully.
The driving safety systems described only work as effectively as possible when there is ade-
quate contact between the tires and the road
surface. Pay particular attention to the informa-
tion regarding tires, recommended minimum tire tread depths etc. in the "Wheels and tires"
section (
Ypage 257).
In wintry driving conditions, always use winter
tires (M+S tires) and if necessary, snow chains.
Only in this way will the driving safety systems
described in this section work as effectively as
possible.
ABS (Anti-lock Braking System)
General information
ABS regulates brake pressure in such a way that the wheels do not lock when you brake. This
allows you to continue steering the vehicle when
braking.
The yellow !ABS warning lamp in the instru-
ment cluster lights up when the ignition is
switched on. It goes out when the engine is run- ning.
ABS works from a speed of about 5 mph
(8 km/h), regardless of road-surface conditions.
ABS works on slippery surfaces, even when you
only brake gently.
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 58).
GWARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally, further driving safety systems are deac-
tivated. There is an increased danger of skid-
ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at a qualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp (
Ypage 194) and dis-
play messages which may be shown in the
instrument cluster (
Ypage 175).
58Driving safety systems
Safety
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!Only operate the vehicle for a maximum of
ten seconds on a brake test dynamometer.
Switch off the ignition.
Application of the brakes by ESP
®may oth-
erwise destroy the brake system.
!A function or performance test should only
be carried out on a two-axle dynamometer.
Before you operate the vehicle on such a
dynamometer, please consult a qualified
workshop. You could otherwise damage the
drive train or the brake system.
If the å ESP
®OFF warning lamp lights up
continuously, ESP®is deactivated.
If the ÷ ESP®warning lamp lights up contin-
uously, ESP®is not available due to a malfunc-
tion.
Observe the information on warning lamps
(
Ypage 196) and display messages which may
be displayed in the instrument cluster
(
Ypage 175).
Only use wheels with the recommended tire
sizes. Only then will ESP
®function properly.
If differential locks are switched on, ABS, BAS
and ESP
®switch off automatically.
Characteristics of ESP®
General information
If the ÷ ESP®warning lamp goes out before
beginning the journey, ESP®is automatically
active.
If ESP
®intervenes, the ÷ESP®warning lamp
flashes in the instrument cluster.
If ESP
®intervenes:
XDo not deactivate ESP®under any circum-
stances.
XOnly depress the accelerator pedal as far as
necessary when pulling away.
XAdapt your driving style to suit the prevailing
road and weather conditions.
ECO start/stop function
The ECO start/stop function switches the
engine off automatically when the vehicle stops
moving. The engine starts automatically when
the driver wants to pull away again. ESP
®
remains in its previously selected status, e.g. if
ESP®was deactivated before the engine was
automatically switched off.
Deactivating/activating ESP®
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 58).
You can select between the following states of
ESP
®:
RESP®is activated.
RESP®is deactivated.
GWARNING
If you deactivate ESP
®, ESP®no longer sta-
bilizes the vehicle. There is an increased risk
of skidding and an accident.
Only deactivate ESP
®in the situations descri-
bed in the following.
It may be best to deactivate ESP
®in the follow-
ing situations:
Rwhen using snow chains
Rin deep snow
Ron sand or gravel
Roff-road
Spinning the wheels results in a cutting action
which provides better grip.
Activate ESP
®as soon as the situations descri-
bed above no longer apply. ESP®will otherwise
not be able to stabilize the vehicle if the vehicle
starts to skid or a wheel starts to spin.
!Avoid spinning the driven wheels for an
extended period with ESP®deactivated. You
could otherwise damage the drivetrain.
Deactivating/activating ESP®
60Driving safety systems
Safety
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XTo deactivate:press button:.
The å ESP®OFF warning lamp in the
instrument cluster lights up.
XTo activate: press button :.
The å ESP®OFF warning lamp in the
instrument cluster goes out.
Characteristics when ESP®is deactivated
If ESP®is deactivated and one or more wheels
start to spin, the ÷ESP®warning lamp in the
instrument cluster flashes. In such situations,
ESP
®will not stabilize the vehicle.
If you deactivate ESP®:
RESP®no longer improves driving stability.
REngine torque is no longer limited and the
drive wheels are able to spin.
RTraction control is still activated.
RESP®still provides support when you brake
firmly.
RMercedes-AMG vehicles: and are driving a
speed at above 62 mph (100 km/h), ESP®still
intervenes when one wheel reaches its grip
limit even though it is deactivated.
RAll other models: and are driving at a speed
above 37 mph (60 km/h), ESP®still inter-
venes when one wheel reaches its grip limit
even though it is deactivated.
Mercedes-AMG vehicles: if ESP
®is deactiva-
ted, it is reactivated automatically if you are
driving at a speed above 62 mph (100 km/h) or
you exceed a certain lateral acceleration.
All other models: if ESP
®is deactivated, it is
re
activated automatically if you are driving at a
speed above 37 mph (60 km/h) or you exceed a
certain lateral acceleration.
Trailer stabilization
General information
If your vehicle/trailer combination begins to
swerve, ESP®assists you in this situation. ESP®
slows the vehicle down by braking and limiting
the engine output until the vehicle/trailer com-
bination has stabilized.
Important safety notes
GWARNING
If road and weather conditions are poor,
trailer stabilization will not be able to prevent
the vehicle/trailer combination from swerv-
ing. Trailers with a high center of gravity can
tip over before ESP
®can detect this. There is
a risk of an accident.
Always adapt your driving style to the prevail-
ing road and weather conditions.
If your vehicle with trailer (vehicle/trailer com-
bination) begins to lurch, you can only stabilize
the vehicle/trailer combination by depressing
the brake firmly.
ESP
®trailer stabilization is active above speeds
of approximately 37 mph (60 km/h).
ESP
®trailer stabilization does not work if ESP®
is deactivated or malfunctioning.
EBD (electronic brake force distribu-
tion)
General information
EBD monitors and controls the brake pressure
on the rear wheels to improve driving stability
while braking.
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 58).
GWARNING
If EBD is malfunctioning, the rear wheels can
lock, e.g. under full braking. This increases the
risk of skidding and an accident.
You should therefore adapt your driving style
to the different handling characteristics. Have
the brake system checked at a qualified spe-
cialist workshop.
Observe information regarding indicator and
warning lamps (
Ypage 194) as well as display
messages (Ypage 176).
ADAPTIVE BRAKE
ADAPTIVE BRAKE provides increased braking
safety. In addition to the braking function,
ADAPTIVE BRAKE also has the HOLD function
(
Ypage 142) and hill start assist (Ypage 107).
Driving safety systems61
Safety
Z
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SmartKey
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
GWARNING
If you attach heavy or large objects to the
SmartKey, the SmartKey could be uninten-
tionally turned in the ignition lock. This could
cause the engine to be switched off. There is a risk of an accident.
Do not attach any heavy or large objects to the
SmartKey. Remove any bulky key rings before
inserting the SmartKey into the ignition lock.
!Keep the SmartKey away from strong mag-
netic fields. Otherwise, the remote control
function could be affected.
Strong magnetic fields can occur in the vicin-
ity of powerful electrical installations.
Do not keep the SmartKey:
Rwith electronic devices, e.g. a mobile phone
or another SmartKey.
Rwith metallic objects, e.g. coins or metal foil.
Rinside metallic objects, e.g. a metal case.
This can affect the functionality of the Smart- Key. A check which periodically establishes a radio
connection between the vehicle and the Smart-
Key determines whether a valid SmartKey is in
the vehicle. This occurs, for example:
Rwhen starting the engine
Rwhile driving
SmartKey functions
:&
Locks the vehicle
;%Unlocks the vehicle
The SmartKey centrally locks/unlocks:
Rthe doors
Rthe rear door
Rthe fuel filler flap
XTo unlock centrally: press the%button.
If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
Rthe vehicle is locked again.
Rprotection against theft is reactivated.
XTo lock centrally: press the&button.
The turn signals flash once when unlocking and
three times when locking.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer (
Ypage 170).
You will receive visual and acoustic locking con-
firmation if all components were able to be
locked.
When the surround lighting is activated via the
on-board computer, it lights up when it is dark
after the vehicle is unlocked with the SmartKey (
Ypage 169).
SmartKey63
Opening and closing
Z
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Exterior lighting
General notes
USA only: if you wish to drive during the daytime
without lights, switch off theDaytime Run‐
ning Lightsfunction via the on-board com-
puter (Ypage 169).
Light switch
Operation
1 WLeft-hand standing lamps
2XRight-hand standing lamps
3TParking lamps, side marker lamps,
license plate and instrument cluster
lighting
4ÃAutomatic headlamp mode, controlled
by the light sensor
5LLow-beam/high-beam headlamps
BRRear fog lamp
If you hear a warning tone when you leave the
vehicle, the lights may still be switched on.
XTurn the light switch to the Ãposition.
The exterior lighting, except the parking lamps/
standing lamps, switches off automatically if
you:
Rremove the SmartKey from the ignition lock
Ropen the driver's door with the SmartKey in
position u
Low-beam headlamps
GWARNING
When the light switch is set to Ã, the low-
beam headlamps may not be switched on
automatically if there is fog, snow or other
causes of poor visibility due to the weather
conditions such as spray. There is a risk of an
accident.
In such situations, turn the light switch to
L.
Even if the light sensor does not detect that it is
dark, the parking lamps and low-beam head-
lamps switch on when the ignition is switched on
and the light switch is set to the Lposition.
This is a particularly useful function in the event
of rain and fog.
XTo switch on the low-beam headlamps:
turn the SmartKey to position 2in the igni-
tion lock or start the engine.
XTurn the light switch to the Lposition.
The green Lindicator lamp on the instru-
ment cluster lights up.
Daytime running lamps
Daytime running lamps in Canada
The daytime running lamps function is required
by law in Canada. It cannot therefore be deac-
tivated.
XTurn the light switch to the Ãposition.
With the engine running: depending on the
ambient light, the daytime running lamps or
the low-beam headlamps are switched on.
When the low-beam headlamps are switched
on, the green Lindicator lamp in the
instrument cluster lights up.
When the engine is running and the vehicle is
stationary: if you shift the automatic transmis-
sion from a driving position to position j, the
daytime running lamps or low-beam headlamps
go out after three minutes.
When the engine is running, the vehicle is sta-
tionary and in bright ambient light: if you turn the
light switch to the Tposition, the daytime
running lamps and parking lamps are switched
on.
If the engine is running and you turn the light
switch to the Lposition, the manual settings
take precedence over the daytime running
lamps.
Daytime running lamps in the USA
In the USA, the daytime running lamps are deac-
tivated upon delivery from the factory.
86Exterior lighting
Lights and windshield wipers
Page 89 of 294

XTo switch on the daytime running lamps:
switch on theDaytime Running Lights
function via the on-board computer
(Ypage 169).
XTurn the light switch to the Ãposition.
With the engine running: depending on the
ambient light, the daytime running lamps or
the low-beam headlamps are switched on.
When the low-beam headlamps are switched
on, the green Lindicator lamp in the
instrument cluster lights up.
If the engine is running and you turn the light
switch to the TorL position, the manual
settings take precedence over the daytime run-
ning lamps.
Automatic headlamp mode
GWARNING
When the light switch is set to Ã, the low-
beam headlamps may not be switched on
automatically if there is fog, snow or other
causes of poor visibility due to the weather
conditions such as spray. There is a risk of an
accident.
In such situations, turn the light switch to
L.
The automatic headlamp feature is only an aid.
The driver is responsible for the vehicle's light-
ing at all times.
à is the favored light switch setting.
The light setting is automatically selected
according to the brightness of the ambient light,
but not in the event of poor visibility due to
weather conditions such as fog, snow or spray.
XTo switch on the automatic headlamps:
turn the light switch to the Ãposition.
With the SmartKey in position 1in the igni-
tion lock, the parking lamps are switched on
or off automatically depending on the bright-
ness of the ambient light.
If you have switched on the Daytime Run‐
ning Lightsfunction via the on-board com-
puter, the daytime running lamps or the park-
ing lamps and low-beam headlamps will
switch on or off automatically while the
engine is running.
When the low-beam headlamps are switched
on, the green Lindicator lamp in the
instrument cluster lights up.
Rear fog lamp
The rear fog lamp improves visibility of your
vehicle for the traffic behind in the event of thick
fog. You must observe the legal requirements
for the country in which you are currently driving
when operating the rear fog lamp.
XTo switch on the rear fog lamp: turn the
SmartKey in the ignition lock to position 2or
start the engine.
XTurn the light switch to the LorÃ
position.
XPress the Rbutton.
The yellow Rindicator lamp on the instru-
ment cluster lights up.
Parking lamps
!
If the battery charge is very low, the parking
lamps or standing lamps are automatically
switched off to enable the next engine start.
Always park your vehicle safely and in a well lit
area, in accordance with the relevant legal
stipulations. Avoid using the Tparking
lamps over a period of several hours. If pos-
sible, switch on the right-hand Xor left-
hand W standing lamps.
XTo switch on: turn the light switch to the
T position.
The green Tindicator lamp on the instru-
ment cluster lights up.
Standing lamps
Switching on the standing lamps ensures the
corresponding side of the vehicle is illuminated.
XTo switch on the standing lamp: turn the
SmartKey to position uin the ignition lock or
remove the SmartKey.
XTurn the light switch to the W(left-hand
side of the vehicle) or X(right-hand side of
the vehicle) position.
Headlamp cleaning system
The headlamps are cleaned automatically if the
"Wipe with washer fluid" function is operated
ten times while the lights are on and the engine
is running (
Ypage 93). When you switch off
Exterior lighting87
Lights and windshield wiper s
Z
Page 90 of 294

the ignition, the automatic headlamp cleaning
system is reset and counting is resumed from 0.
Combination switch
:High-beam headlamps
;Turn signal, right
=High-beam flasher
?Turn signal, left
XTo indicate briefly:press the combination
switch briefly to the pressure point in the
direction of arrow ;or?.
The corresponding turn signal flashes three
times.
XTo indicate: press the combination switch
beyond the pressure point in the direction of
arrow ;or?.
XTo switch on the high-beam headlamps:
turn the light switch to the LorÃ
position.
XPress the combination switch beyond the
pressure point in the direction of arrow :.
In the Ãposition, the high-beam head-
lamps are switched on only when it is dark and the engine is running.
The blue Kindicator lamp on the instru-
ment cluster lights up when the high-beam
headlamps are switched on.
XTo switch off the high-beam headlamps:
move the combination switch back to its nor-
mal position.
The blue Kindicator lamp on the instru-
ment cluster goes out.
XHigh-beam flasher: pull the combination
switch in the direction of arrow =.
Hazard warning lamps
XTo switch the hazard warning lamps on/
off:press button :.
The turn signal lamps flash when the hazard
warning lamps are switched on. If you now
switch on a turn signal lamp using the com-
bination switch, only the turn signal lamp on
the corresponding side of the vehicle will
flash.
The hazard warning lamps automatically switch
on if:
Ran air bag is deployed or
Rthe Emergency Tensioning Devices are trig-
gered, or
Rthe vehicle decelerates rapidly from a speed
of above 45 mph (70 km/h) and comes to a
standstill
The hazard warning lamps switch off automati-
cally if the vehicle reaches a speed of above
6 mph (10 km/h) again after a full brake appli-
cation.
The hazard warning lamps still operate if the
ignition is switched off.
Headlamps fogged up on the inside
Certain climatic and physical conditions may
cause moisture to form in the headlamp. This
moisture does not affect the functionality of the
headlamp.
88Exterior lighting
Lights and windshield wiper s
Page 92 of 294

the Xenon bulb and touch the electrical con-
tacts. There is a risk of fatal injury.
Never touch the parts or the electrical con-
tacts of the Xenon bulb. Always have work onthe Xenon bulbs carried out at a qualified spe-
cialist workshop.
GWARNING
Bulbs, lamps and connectors can get very hot
when operating. If you change a bulb, you
could burn yourself on these components.
There is a risk of injury.
Allow these components to cool down before
changing a bulb.
Do not use a bulb if it has been dropped or if its glass tube has been scratched.
The bulb may explode if:
Ryou touch it
Rit is hot
Ryou drop it
Ryou scratch it
Use bulbs only in closed lamps that have been
designed for this purpose. Only install spare
bulbs of the same type and the specified volt-
age.
Marks on the glass tube reduce the service life
of the bulbs. Do not touch the glass tube with
your bare hands. If necessary, clean the glass
tube when cold with alcohol or spirit and rub it
off with a lint-free cloth.
Protect bulbs from moisture during operation.
Do not allow bulbs to come into contact with
liquids.
Xenon bulbs and LED modules: in addition to
the Xenon bulbs, there are LED modules which
you cannot change yourself.
Have the following bulbs replaced at a qualified
specialist workshop:
RHigh-mounted brake lamp
RAdditional turn signals in the exterior mirrors
RParking lamps/standing lamps (front)
RHigh-beam/low-beam headlamps (Xenon
headlamps)
RDaytime running lamps
RLicense plate lamp
RSide marker lamps
iIndividual segments of the license plate
lamp LEDs may fail without a display message
appearing in the multifunction display. Regu-
larly check the license plate lamp. If neces-
sary, visit a qualified specialist workshop.
You can replace the following bulbs:
RTurn signal lamp (front)
RBrake/tail lamp
RTurn signal lamp (rear)
RTail lamps/standing lamps
RBackup lamp
RRear fog lamp
Replace only the bulbs listed (
Ypage 90).
Have the bulbs that you cannot change yourself
replaced at a qualified specialist workshop.
If you require assistance replacing bulbs, con-
sult a qualified specialist workshop.
If the new bulb still does not light up, consult a
qualified specialist workshop.
Headlamps and lights are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times. Have
the headlamp setting checked regularly.
Overview of bulb types
Front bulbs
You can replace the following bulbs. The bulb
type can be found in the legend.
:Turn signal lamp: 1156 NA
Rear bulbs
You can replace the following bulbs. The bulb
type can be found in the legend.
90Replacing bulbs
Lights and windshield wiper s
Page 96 of 294

Switching the rear window wiper on/
off
:èSwitch
2bWipes with washer fluid
3ISwitches on intermittent wiping
40 Switches off intermittent wiping
5b Wipes with washer fluid
XTurn the SmartKey to position 1or2 in the
ignition lock.
XTurn switch :on the combination switch to
the corresponding position.
When the rear window wiper is switched on,
the icon appears in the instrument cluster.
The rear window wiper comes on automatically
if you shift the automatic transmission to posi-
tion kwhile the windshield wipers are on.
Replacing the wiper blades
Important safety notes
GWARNING
If the windshield wipers begin to move while
you are changing the wiper blades, you could be trapped by the wiper arm. There is a risk of
injury.
Always switch off the windshield wipers and
ignition before changing the wiper blades.
!To avoid damaging the wiper blades, make
sure that you touch only the wiper arm of the
wiper.
!Never open the hood if a windshield wiper
arm has been folded away from the wind-
shield. Never fold a windshield wiper arm without a
wiper blade back onto the windshield/rear
window.
Hold the windshield wiper arm firmly when
you change the wiper blade. If you release the
windshield wiper arm without a wiper blade
and it falls onto the windshield, the windshield
may be damaged by the force of the impact.
Mercedes-Benz recommends that you have
the wiper blades changed at a qualified spe-
cialist workshop.
Removing the wiper blades
XRemove the SmartKey from the ignition lock.
XFold wiper arm :away from the windshield
until it engages.
XPosition wiper blade ;horizontally.
XPress locking spring ?.
XSlide wiper blade;with hinge piece =from
wiper arm :.
Installing the wiper blade
XSlide wiper arm :into new wiper blade ;
with hinge piece =.
XEngage spring clip ?into the end of the wiper
arm.
94Windshield wipers
Lights and windshield wipers