MERCEDES-BENZ GLS 2023 Owners Manual

vehicle systems. If the Telediagnosis service isactivated, relevant data is automatically transmit-
ted to the manufacturer. If fault conditions are
detected by the vehicle system self-diagnosis, the system transmits recommendations for action to
the Mercedes-Benz customer center depending on the fault detected. The customer center trans-
mits the data to the service partner that you have entered on the Mercedes me website at: http://
www.mercedes.me.
For selected faults, the notiNcation that a mal-
function has been detected may appear in the multimedia system with a request to contact the
Mercedes-Benz customer center. From this mes- sage, a call can be made directly to the customercenter for assistance.\bThe transmission of a notiNcation to the multi-
media system depends on the country, vehi- cle model and equipment and requires a fast
data connection, over which the service pro-
vider has no inOuence.\bReliable fault detection is subject to technical
limitations. Therefore, only a limited selection
of faults can be detected and recommenda- tions for action transmitted to the customercenter and the service partners. Mercedes- Benz AG is continuously working on theexpansion of this service. The fault detection
depends on the country, vehicle model and equipment.
Data transferred when using Telediagnosis
When the service is activated, relevant data is
automatically transferred to determine the next
required scope of maintenance as well as fault
detection and fault rectiNcation.
Details on data transfer can be found in the data protection information for the Mercedes me con-
nect services. These can be found at: http://
www.mercedes.me under "My Mercedes me
account", "Terms of use".
\bThe scope of the data transmitted depends on
the vehicle model and equipment. For techni-
cal reasons, not all data is available at all
times.Engine compartment
Opening and closing the hood
&WARNING Risk of accident due to driving
with the hood unlocked
The hood may open and block your view.
Never release the hood when driving.Before every trip, ensure that the hood is
locked.&WARNING Risk of accident and injury
when opening and closing the hood
The hood may suddenly drop into the end position.
There is a risk of injury for anyone in the
hood\bs range of movement.
Do not open or close the hood if there is a person in the hood\bs range of move-
ment.Maintenance and care339

&WARNING Risk of burns when opening the
hood
If you open the hood in the event of an over- heated engine or Nre in the engine compart-
ment, the following situations may occur:
= You may come into contact with hot gases.
= You may come into contact with other
escaping hot operating Ouids.
Before opening the hood, allow the
engine to cool down.In the event of a Nre in the engine com-
partment, keep the hood closed and call
the Nre service.&WARNING Risk of injury due to moving
parts
Components in the engine compartment may continue to run or start unexpectedly even
when the drive system is switched oM.
Observe the following if you must open the
hood:
Switch oM the vehicle.Never touch the danger zones surround-
ing moving components, e.g. the rotation
area of the fan.Remove jewelery and watches.Keep items of clothing and hair away from moving parts.&WARNING Risk of injury from touching live
components
The ignition system and the fuel injection sys- tem operate with a high voltage. You could
receive an electric shock.
Never touch components of the ignition
system or fuel injection system when the vehicle is switched on.The live components include the following, for
example:
= Ignition coils
= Fuel injectors=Electric lines to the ignition coils and the fuel
injectors&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING Risk of injury from using the
windshield wipers when the hood is open
If the windshield wipers start moving when the
hood is open, you could be trapped by the wiper linkage.
Always switch oM the windshield wipers
and the vehicle Nrst if you need to open
the hood.340Maintenance and care

Opening the hoodTo release the hood, pull on handle 1.Push handle 1 of the hood catch upwards
and lis the hood until it opens automatically.
Closing the hood
*NOTE Damage to the hood
If the hood is closed manually, there is a risk
of dents.
Do not close the hood manually.Lower the hood to a height of around 8 in
(20 cm) and then allow it to fall, applying a lit-
tle force as you let it go.If the hood can still be lised slightly, open the
hood again and close it with a little more force
until it engages correctly.
Engine oil
Checking the engine oil level using the on-board
computer
Requirements: = The engine has been warmed up.
= The vehicle is parked on a level surface.
= The engine is running at idle speed.
= The hood is closed.
The engine oil level is determined during driving.
Determining the engine oil level can take up to
30 minutes with a normal driving style and even
longer with an active driving style.
Maintenance and care341

On-board computer:4 Service 5
Engine Oil Level
One of the following messages will appear on the instrument display:
= Measuring Engine Oil Level... : measurement
of the oil level is not yet possible.Repeat the request aser a maximum of
30 minutes\b driving.
= Engine Oil Level OK and the bar display for
indicating the oil level on the instrument dis-
play is green and is between "min" and "max": the oil level is correct.
= Engine Oil Level Add 1,1 qts. and the bar dis-
play for indicating the oil level on the instru- ment display is orange and is below "min":
Add 1.1 US qt (1 l) of engine oil.
= Reduce Engine Oil Level and the bar display
for indicating the oil level on the instrument display is orange and is above "max":
Drain oM any excess engine oil that has been
added. To do so, consult a qualiNed specialist
workshop.
= For Engine Oil Level Switch Ignition On
Switch on the vehicle to check the engine oil
level.
= Engine Oil Level System Inoperative : The oil
level sensor is defective or not connected.
Consult a qualiNed specialist workshop.
=
Engine Oil Level System Currently Unavail.
Close the hood.
ReNlling engine oil
&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING Risk of Nre and injury from
engine oil
If engine oil comes into contact with hot com- ponent parts in the engine compartment, it
may ignite.
Make sure that no engine oil is spilled next to the Nller opening.Allow the engine to cool oM and thor-
oughly clean the engine oil from compo-
nent parts before starting the vehicle.*NOTE Engine damage caused by an incor-
rect oil Nlter, incorrect oil or additivesDo not use engine oils or oil Nlters which
do not correspond to the speciNcations
explicitly prescribed for the service inter- vals.Follow the instructions on the service
interval display for changing the engine
oil and observe the prescribed change
intervals.Do not use additives.342Maintenance and care

*NOTE Damage caused by reNlling too
much engine oil
Too much engine oil can damage the engine or
the catalytic converter.
Have excess engine oil removed at a
qualiNed specialist workshop.\bDepending on driving style, the vehicle con-
sumes up to 0.9 US qt (0.8 l) of oil per 600 miles (1,000 km). The oil consumptionmay also be higher than this when the vehicle
is new or if you frequently drive at high engine
speeds.\bDepending on the engine, the cap may be
located in diMerent positions in the engine
compartment.Turn cap 1 counter-clockwise and remove it.Add engine oil.Replace cap 1 and turn it clockwise until it
engages.Check the oil level again (  page 341).Checking the coolant level&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING Risk of scalding from hot cool-
ant
If you open the cap, you could be scalded.
Let the motor cool down before opening
the cap.When opening the cap, wear protective
gloves and safety glasses.Open the cap slowly to release pressure.Maintenance and care343

Park the vehicle on a level surface.Check the coolant temperature display on theInstrument Display.
The coolant temperature must be in the bot-
tom quarter of the temperature indicator.Slowly turn cap 1 counter-clockwise to
release overpressure.Continue turning cap 1 counter-clockwise
and remove it.
The coolant level is correct in the following cases:
= If the engine is cold, the coolant is up to
marker bar 2.
= If the engine is warm, the coolant is up to
0.6 in (1.5 cm) over marker bar 2.
If necessary, reNll with coolant that has been
approved for Mercedes-Benz.\bFurther information on coolant (  page 417)
ReNlling the windshield washer system
&WARNING Risk of burns from hot compo-
nent parts in the engine compartment
Certain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of the exhaust system.
Allow the engine to cool down and only
touch component parts described in the
following.&WARNING !

Remove cap 1 by the tab.Add washer Ouid.\bFurther information about the windshield
washer Ouid ( page 418)Keeping the air/water duct freeKeep the area between the hood and the
windshield free of deposits, e.g. ice, snow or
leaves.
Cleaning and care
Information on washing the vehicle in a car wash
&WARNING Risk of accident due to
reduced braking eMect aser washing the
vehicle
The braking eMect is reduced aser washing
the vehicle.
Aser the vehicle has been washed, brake
carefully while paying attention to the
traPc conditions until the braking eMect
has been fully restored.*NOTE Damage caused by automatic brak-
ing
If one of the following functions is activated, the vehicle brakes automatically in certain sit-
uations:
= Active Brake Assist
= Active Distance Assist DISTRONIC
= HOLD function
= Active Parking Assist
To avoid damage to the vehicle, deactivate
these systems in the following or similar situa-
tions:
During towing.In a car wash.*NOTE Damage due to unsuitable car washBefore driving into a car wash make sure
that the car wash is suitable for the vehi-
cle dimensions.Maintenance and care345

Ensure there is suPcient ground clear-
ance between the underbody and the guide rails of the car wash.Ensure that the clearance width of the
car wash, in particular the width of the
guide rails, is suPcient.
To avoid damage to your vehicle when using a car
wash, ensure the following beforehand:
= Active Distance Assist DISTRONIC is deactiva-
ted.
= The HOLD function is switched oM.
= The 360° Camera or the reversing camera is
switched oM.
= The side windows and sliding sunroof are com-
pletely closed.
= The outside mirrors are folded in.
= The blower for the ventilation and heating is
switched oM.
= The windshield wiper switch is in position Z.
= The key is at a minimum distance of 10 s
(3 m) away from the vehicle. The tailgate could
otherwise open unintentionally.
= For car washes with a conveyor system:
- Neutral \\ is engaged.
- If you would like to leave the vehicle while
it is being washed, make sure the key islocated in the vehicle. Park position ] is
otherwise automatically engaged.\bTo prevent damage to the tires or rims, drive
straight and into the center of the guide rails
of the car wash.\bIf, aser the car wash, you remove the wax
from the windshield and wiper rubbers, this
will prevent smearing and reduce wiper noise.
Automatic car wash mode
In car wash mode, the vehicle is prepared for driv-
ing into the automatic car wash. Car wash mode
can be activated at a speed of up to 12 mph
(20 km/h) (  page 347).
The following settings are adjusted when car wash
mode is activated:
= The outside mirrors are folded in.
= To prevent the windshield washer system from
starting up automatically, the rain sensor is
deactivated.
= The rear window wiper is deactivated.
= Mercedes-Maybach vehicles: the running
boards are retracted.
= The air conditioning system is set to air-recir-
culation mode.
= Parking Assist PARKTRONIC is deactivated.
= Vehicles with 360° Camera: the front image is
activated aser approx. eight seconds.
= Vehicles with AIRMATIC: the vehicle is raised
to the maximum possible chassis level (  page 250).
If rising takes longer than 25 seconds, the fol-
lowing message appears on the Instrument Display:
Preparation for Automatic Car Wash Incom-
plete See Media Display . Aser some time, the
vehicle automatically continues rising.
= Vehicles with E-ACTIVE BODY CONTROL: the
vehicle is raised to the maximum possible chassis level (  page 258).
If rising takes longer than 25 seconds, the fol-
lowing message appears on the Instrument Display:346Maintenance and care

Preparation for Automatic Car Wash Incom-
plete See Media Display . Aser some time, the
vehicle automatically continues rising.
If one of the settings cannot be selected, this is
displayed by an behind the respective set-
ting.
Above a speed of 12 mph (20 km/h) car wash mode is automatically deactivated.
The following settings are reset when car wash
mode is deactivated:
= The outside mirrors are folded out.
= The rain sensor is activated.
= The rear window wiper is activated.
= The air conditioning system is set to fresh air
mode.
= Parking Assist PARKTRONIC is reset to the
previously selected setting.
= Mercedes-Maybach vehicles: the running
boards remain retracted.
= Vehicles with 360° Camera: the front image is
deactivated at speeds above 11 mph
(18 km/h).= Vehicles with AIRMATIC: the vehicle is lowered
to the previously set chassis level.
= Vehicles with E-ACTIVE BODY CONTROL: the
vehicle is lowered to the previously set chassis
level.
Activating/deactivating automatic car wash mode
Requirements: = The vehicle is stationary.
= The engine is running.
Multimedia system: 4 © 5
Settings 5
Quick Access
Activating automatic car wash mode
Select Automatic Car Wash Mode .Select Start.
If one of the settings cannot be selected, this is
displayed by an behind the respective set-
ting.
\bFor an overview of the settings made when activating automatic car wash mode
(  page 345).Deactivating automatic car wash modeSelect Stop.
The automatic car wash settings are reset.\bThe automatic car wash mode is automatically
deactivated as soon as a speed of 12 mph
(20 km/h) is exceeded.
Information on using a power washer
&WARNING Risk of an accident when using
power washers with round-spray nozzles
The water jet can cause externally invisible
damage.
Components damaged in this way may unex-
pectedly fail.
Do not use a power washer with round- spray nozzles.Have damaged tires or chassis parts
replaced immediately.Maintenance and care347

To avoid damage to your vehicle, observe the fol-lowing when using a power washer:
= The key is at a minimum distance of 10 s
(3 m) away from the vehicle. Otherwise the
tailgate could open unintentionally.
= Maintain a distance of at least 11.8 in (30 cm)
to the vehicle.
= Vehicles with decorative foil: Parts of your
vehicle are covered with a decorative foil. Maintain a distance of at least 27.6 in (70 cm)
between the foil-covered parts of the vehicle
and the nozzle of the power washer. Move the power washer nozzle around while cleaning.
The water temperature of the power washer
must not exceed 140 °F (60 °C).
= Observe the information on the correct dis-
tance in the equipment manufacturer\bs opera-
tor manual.
= Do not direct the nozzle of the power washer
directly at sensitive parts, e.g. tires, gaps,
electrical component parts, batteries, lighting
and louvers.Washing the vehicle by hand*NOTE Engine damage due to water ingressTake care not to point the water jet
directly towards the air inlet grille below the hood.
Observe the relevant legal requirements (e.g. in
some countries, washing by hand is permitted
only in specially designated wash bays).
Use a mild cleaning agent (e.g. car shampoo).Wash the vehicle with lukewarm water using a
sos car sponge. When doing so, do not
expose the vehicle to direct sunlight.Carefully hose the vehicle oM with water and
dry using a chamois.\bObserve the notes on the care of vehicle
parts (  page 350).
Notes on paintwork/matt Nnish paintwork care
To avoid damaging the paintwork and interfering
with the driving assistance systems, please
observe the following notes:
Paint
= Insect remains: soak with insect remover and
rinse oM the treated areas aserwards.
= Bird droppings: soak with water and rinse oM
aserwards.
= Tree resin, oils, fuels and greases: remove by
rubbing gently with a cloth soaked in petro- leum ether or lighter Ouid.
= Coolant and brake Ouid: remove with a damp
cloth and clean water.
= Tar stains: use tar remover.
= Wax: use silicone remover.
= Do not attach stickers, Nlms or similar materi-
als. Have Nlm attached to the bumper only at
a qualiNed specialist workshop.
= Remove dirt immediately, where possible.
Matt Nnish
= Use only care products approved for
Mercedes-Benz.
= Do not attach stickers, Nlms or similar materi-
als. Have Nlm attached to the bumper only at
a qualiNed specialist workshop.348Maintenance and care