MERCEDES-BENZ GLC SUV 2022 Owners Manual

Notes on the 48 V battery
&
WARNING Risk of an accident due t o work
carried out incorrectly on the battery
Work carried out incorrectly on the battery
can, f
or example, lead to a short circuit. This
can restrict functions relevant for safety sys-
tems and impair the operating safety of your
vehicle.
You could lose control of the vehicle in the fol-
lowing situations in particular:
= when braking
= in the event of abrupt steering manoeuvres
and/or when the vehicle's speed is not
adapted to the road conditions 
In the event of a short circuit or a similar
incident, cont
act a qualiNed specialist
workshop immediately. 
Do not drive on. 
Always have work on the battery carried
out at a q

ualiNed specialist workshop. =
F
urther information on ABS (  page 239)=
F
urther information on ESP n
( page 240)
For safety reasons, Mercedes-Benz recommends
that you only use batteries which have been
approved for your vehicle by Mercedes-Benz.
+ ENVIRONMENTAL NOTE
En
vironmental
damage due to improper disposal of bat-
teries Batteries contain pollutants. It is
illeg

al to dispose of them with the household
rubbish. 
Dispose of batteries in an environ-
ment

ally responsible manner. Take dis-
charged batteries to a qualiNed specialist
workshop or to a collection point for
used batteries. If you have to disconnect the 48 V battery, con-
t
act a qualiNed specialist workshop. Comply with safety notes and take protective
measur

es when handling batteries. Risk of explosion if the 48 V battery is
used im

properly. Fire, naked
Oames and smoking ar
e pro-
hibited when handling the battery. Avoid
creating sparks. Electrolyte or battery acid is corrosive.
A

void contact with the skin, eyes or cloth-
ing. Wear suitable protective clothing, in
particular gloves, an apron and a face
mask. Immediately rinse oM splashes of
electrolyte or acid with plenty of clean
water. Consult a doctor immediately. Do not place heavy objects on the surface
of t
he battery or use the battery to sup-
port a person in any way. Do not perform any work on the battery.
Alw

ays have any work on the battery car-
ried out at a qualiNed specialist workshop.
Do not disconnect the battery yourself.
Do not remove the battery yourself. Do
not attempt to open the battery. 408
Breakdown assistance

Keep children away.
Wear safety glasses.
Observe this Owner's Manual.
Observe the following if you do not intend to use
t he vehicle over an extended period of time:
= Not plug-in hybrid: switch to standby mode.
Activating/deactivating standby mode
(  page 237, 236) Notes on starting assistance and charging the 12
V batt
ery All vehicles
When c

harging the battery and during starting
assistance, always use the jump-start connection
point in the engine compartment. *
NOTE Damag
e to the battery due to over-
voltage When charging using a battery charger without
a maximum c
harging voltage, the battery or
the on-board electronics may be damaged. 
Only use battery chargers with a maxi-
mum c

harging voltage of 14.8 V. &
WARNING Risk of e
xplosion due to the
ignition of hydrogen gas
If there is a short circuit or sparks are created,
t
here is a danger of hydrogen gas igniting
when you charge the battery. 
Make sure that the POSITIVE terminal of
a connect

ed battery does not come into
contact with vehicle parts. 
Never place metal objects or tools on a
batt
ery. 
When connecting and disconnecting the
batt
ery, always observe the sequence of
battery terminals described. 
During starting assistance, always take
car

e to connect only battery terminals of
identical polarity. 
During starting assistance, observe the
seq
uence described for connecting and
disconnecting the jump leads. 
Do not connect or disconnect the bat-
t

ery terminals with the engine running. &
WARNING Risk of e
xplosion due to explo-
sive mixture of gases
An explosive mixture of gases can escape
fr
om the battery during charging and starting
assistance. 
Fire, naked Oames, smoking and cr
eating
sparks must be avoided. 
Make sure there is adequate ventilation. 
Do not stand over the battery. Breakdown assistance
409

&
WARNING Risk of e xplosion from a frozen
battery
A discharged battery may freeze at tempera-
tur
es slightly above or below freezing point.
During starting assistance or battery charging,
battery gas can be released. 
Always allow a battery to thaw before
c
harging it or performing starting assis-
tance. If the indicator/warning lamps in the instrument
clus
ter do not light up at low temperatures, it is
very likely that the discharged battery has frozen.
In this case you may neither jump-start the vehi-
cle nor charge the battery.
The service life of a battery that has been thawed
may be dramatically shortened. The starting char-
acteristics may be impaired, especially at low
temperatures.
It is recommended that you have a thawed battery
checked at a qualiNed specialist workshop. Plug-in hybrid
If y

our vehicle has been started with starting
assistance, it may not be possible to use the elec-
tric drive for approximately 30 minutes.
Starting assistance is not considered to be a nor-
mal operating condition.
All vehicles
* NOTE Damag
e caused by numerous or
extended attempts to start the engine Numerous or extended attempts to start the
engine ma

y damage the catalytic converter
due to non-combusted fuel. 
Avoid numerous and extended attempts
t

o start the engine. Observe the following points during starting assis-
t
ance and when charging the battery:
= Only use undamaged jump lead/charging
cables with a suPcient cross-section and
insulated terminal clamps.
= Non-insulated parts of the terminal clamps
must not come into contact with other metal parts while the jump lead/charging cable is
connect

ed to the battery/jump-start connec-
tion point.
= The jump lead/charging cable must not come
into contact with any parts which may move
when the engine is running.
= Always make sure that neither you nor the bat-
tery is electrostatically charged.
= Keep away from Nre and naked Oames.
= Do not lean over the battery.
Observe the additional following points when
charging the battery:
= Only use battery chargers tested and
approved for Mercedes-Benz.
= Read the battery charger's operating instruc-
tions before charging the battery.
Observe the additional following points during
starting assistance: = Starting assistance may only be provided
using vehicles, batteries or other jump start
devices with a nominal voltage of 12 V.
= The vehicles must not touch. 410
Breakdown assistance

=
V ehicles with a petrol engine: jump-start the
vehicle only when the engine and exhaust sys-
tem are cold. Starting assistance and charging the 12 V battery
Preparing starting assistance/charging

Secure the vehicle by applying the electric
par
king brake. 
Shis t
he transmission to position j.
Switch oM t
he vehicle and all electrical con-
sumers. 
Open the bonnet. 
Open cover 1 of t
he jump-starting connec-
tion points. 
Open cover 3 of positiv
e contact 2 of the
jump-starting connection points.
Starting assistance 
Connect positive contact 2 on y
our vehicle
to the positive terminal of the donor battery using the jump lead. Always begin with posi-
tiv
e contact 2 on your own vehicle Nrst. 
Start the engine of the donor vehicle and run
it at idling speed. 
Connect the negative terminal of the donor
batt

ery to earth point 4 of your vehicle using
the jump lead. Begin with the donor battery
Nrst. 
Start the engine of your own vehicle. 
Let the engines run for several minutes. 
Before disconnecting the jump leads, switch
on an electr

ical consumer in your own vehicle,
e.g. the rear window heater or the lighting.
When the starting assistance procedure is com-
ple
te: 
First, remove the jump leads from earth point
4 and t
he negative terminal of the donor bat-
tery, then from positive contact 2 and the
positive terminal of the donor battery. Begin
each time with the contacts on your own vehi-
cle Nrst. Breakdown assistance
411


Aser removing the jump leads, close cover 3
of positive contact 2.
Close cover 1.
If your vehicle has been started with starting
assis
tance, it may not be possible to use the elec-
tric drive for approximately 30 minutes.
Further information can be obtained at a qualiNed
specialist workshop.
Charging 
Connect positive contact 2 of t
he vehicle to
the positive terminal of the charger using the
charging cable. Always begin with positive
contact 2 of the vehicle. 
Connect the negative terminal of the charger
and ear
th point 4 on the vehicle with the
charging cable. Start with the charger. 
Start the charging process.
When the charging process is complete: 
First, remove the charging cable from earth
point 4 and t
he negative terminal of the
charger, then from positive contact 3 and the positive terminal of the charger. Begin
eac

h time with the contacts of the vehicle. 
Aser r
emoving the charging cable, close cover
3 of positive contact 2. 
Close cover 1.
Further information can be obtained at a q
ualiNed
specialist workshop. Replacing the 12 V battery

Observe the notes on the 12 V battery
( pag
e 406).
Mercedes-Benz recommends that you have the
12 V batt
ery replaced at a qualiNed specialist
workshop, e.g. at a Mercedes-Benz Service
Centre.
Observe the following notes if you want to replace
the battery yourself:
= Always replace a faulty battery with a battery
which meets the speciNc vehicle require-
ments.
The vehicle is equipped with an AGM technol-
ogy battery (Absorbent Glass Mat) or a lith- ium-ion battery. Full vehicle functionality is
onl

y guaranteed with an AGM battery or lith-
ium-ion battery. For safety reasons, Mercedes-
Benz recommends that you only use batteries
which have been tested and approved for your
vehicle by Mercedes-Benz.
= Carry over detachable parts, such as vent
hoses, elbow Nttings or terminal covers from
the battery being replaced.
= Make sure that the vent hose is always con-
nected to the original opening on the side of
the battery.
Fit any existing or supplied cell caps.
Otherwise, gases or battery acid could
escape.
= Make sure that detachable parts are recon-
nected in the same way. 412
Breakdown assistance

Tow-starting or towing away
Permitted towing methods
*
NOTE Damag e from automatic braking If one of the following functions is activated,
t
he 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: 
when being towed 
in a car wash Mercedes-Benz recommends transporting your
v
ehicle in the case of a breakdown, rather than
towing it away.
For towing with both axles on the ground, use a
tow rope or tow bar. Do not use tow bar systems. *
NOTE Damag
e to the vehicle due to tow-
ing away incorrectly 
Observe the instructions and notes on
t

owing away. Vehicles with automatic transmission
Permitted towing methods
Both axles on
t

he ground Yes, maximum 50 km at
50 km/h
Front axle
r
aised No
Rear axle
r
aised Yes, if the steering wheel is
Nx
ed in the centre position
with a steering wheel lock Towing with a raised axle:
t
owing should be per-
formed by a towing company. 4MATIC vehicles Permitted towing methods
Both axles on
t

he ground Yes, maximum 50 km at
50 km/h
Front axle
r
aised No
Rear axle
r
aised No Permitted towing methods (plug-in hybrid)
Mercedes-Benz recommends transporting your
v
ehicle in the case of a breakdown, rather than
towing it away.
For towing, use a tow rope or tow bar with both
axles on the ground. Do not use tow bar systems.
* NOTE Damag
e to the vehicle due to tow-
ing away incorrectly 
Observe the instructions and notes on
t

owing away. Breakdown assistance
413

Observe the information on towing and transport-
ing t
he vehicle in the vehicle Owner's Manual.
In the following situations, only transporting the
vehicle is permitted:
= the driver's display is not working
= the

*
NOTE Damag e due to towing away at
excessively high speeds or over long dis-
tances The drivetrain could be damaged when towing
at e
xcessively high speeds or over long distan-
ces. 
A towing speed of 50 km/h must not be
e

xceeded. 
A towing distance of 50 km must not be
e

xceeded. &
WARNING Risk of accident when t
owing a
vehicle which is too heavy
If the vehicle to be tow-started or towed away
is hea
vier than the permissible gross mass of
your vehicle, the following situations can
occur:
= the towing eye may become detached.
= the vehicle/trailer combination may
swerve or overturn. 
Before tow-starting or towing away,
c

heck if the vehicle to be tow-started or towed away exceeds the permissible
g

ross mass. If a vehicle has to be tow-started or towed away,
its per
missible gross mass must not exceed the
permissible gross mass of the towing vehicle. 
Information on the permissible gross mass of
t

he vehicle can be found on the vehicle identi-
Ncation plate ( page 439). 
Vehicles with automatic transmission: do no
t
open the driver's door or front passenger
door; the transmission otherwise automati-
cally shiss to position j. 
Fit the towing eye ( pag
e 417). 
Fasten the towing device.
* NOTE Damag
e due to incorrect connec-
tion of the tow bar 
Only connect the tow rope or tow bar to
t
he towing eyes. 
Deactivate the automatic locking mechanism . 
Do not activate the HOLD function. 
Deactivate tow-away protection
( pag

e 103). 
Deactivate Active Brake Assist ( pag
e 269). 
Vehicles with automatic transmission: shis t
o
position i. 
Release the electric parking brake. &
WARNING Risk of accident due t
o limited
safety-related functions during the towing
process
Safety-related functions are limited or no lon-
g
er available in the following situations:
= the vehicle is switched oM.
= the brake system or power steering system
is malfunctioning.
= the energy supply or the on-board electri-
cal system is malfunctioning.
When your vehicle is towed away, signiNcantly
more eMort may be required to steer and
brake than is normally required. 
Use a tow bar. Breakdown assistance
415


Make sure that the steering wheel can
mo
ve freely before towing the vehicle
away. *
NOTE Damag
e due to excessive tractive
power If you pull away sharply, the tractive power
ma

y be too high and the vehicles could be
damaged. 
Pull away slowly and smoothly. Loading the vehicle for transport
Hybrid vehicles:
tr
ansportation of vehicles should
only be carried out by professional recovery com-
panies. 
Observe the notes on towing away
( pag
e 414). 
Connect the towing device to the towing eye
in or

der to load the vehicle.
% You can also attach the tow bar to the trailer
hitc
h. 
Shis t
he automatic transmission to position
i.
% The automatic transmission may be locked in
position j in t
he event of damage to the
electrics. To shis to i, provide the on-board
electrical system with power ( page 411). 
Load the vehicle onto the transporter. 
Shis t
he automatic transmission to position
j. 
Use the electric parking brake to secure the
v

ehicle against rolling away. 
Only secure the vehicle by the wheels. 
Make sure that the front and rear axles come
t
o rest on the same transportation vehicle.
* NOTE Damag
e to the drive train due to
incorrect positioning of the vehicle 
Do not position the vehicle above the
connection point of t

he transport vehi-
cle. Towing eye storage location
The towing eye
1 is locat
ed under the load com-
partment Ooor in the load sill.416
Breakdown assistance

Fitting and removing the towing eye

Press the cover 1 in wards and remove it.
Screw in the towing eye clockwise as far as it
will go and tight

en.
Vehicles with a trailer hitch: v
ehicles with a trailer
hitch do not have a rear bracket for the towing
eye. Fasten the tow bar to the trailer hitch. 
Make sure that cover 1 eng
ages in the
bumper when you remove the towing eye.
* NOTE Damag
e to the vehicle due to incor-
rect use of the towing eye or trailer hitch When a towing eye or trailer hitch is used to
r
ecover a vehicle, the vehicle may be damaged
in the process. 
Only use the towing eye or trailer hitch to
t

ow away or tow start the vehicle. 
Do not use the towing eye or trailer hitch
t

o tow the vehicle during recovery. Tow-starting the vehicle
Vehicles with automatic transmission
* NOTE Damag
e to the automatic transmis-
sion due to tow-starting The automatic transmission may be damaged
in t
he process of tow-starting vehicles with
automatic transmission. 
Vehicles with automatic transmission
mus

t not be tow-started. 
Vehicles with an automatic transmission must
no

t be tow-started. Electrical fuses
Notes on electrical fuses
&
WARNING Risk of accident and injur
y due
to overloaded lines
If you manipulate or bridge a faulty fuse or if
y
ou replace it with a fuse with a higher amper-
age, the electric line could be overloaded.
This could result in a Nre. 
Always replace faulty fuses with speci-
Ned ne

w fuses containing the correct
amperage. Breakdown assistance
417