MERCEDES-BENZ C CLASS 2023 Owners Manual

All vehicles*NOTE Damage caused by numerous or
extended attempts to start the engine
Numerous or extended attempts to start the
engine may damage the catalytic converter
due to non-combusted fuel.
Avoid numerous and extended attempts
to start the engine.
Observe the following points during starting assis-
tance and when charging the battery:
= Only use undamaged jumper cable/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 jumper cable/charging cable is connected to the battery/jump-start con-
nection point.
= The jumper cable/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 open 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\bs 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.
= Vehicles with a gasoline 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 electricparking brake.Shis the transmission to position ].Switch oM the vehicle and all electrical con-
sumers.Open the hood.
Example illustrations
Open cover 1 of the jump-starting connec-
tion points.Breakdown assistance329

Open cover 2 of positive contact 3 of the
jump-starting connection points.
Jump-starting
Connect positive contact 3 on your vehicle
to the positive terminal of the donor battery using the jumper cable. Always begin with positive contact 3 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
battery to ground point 4 of your vehicle
using the jumper cable. Begin with the donor battery Nrst.Start the engine of your own vehicle.Let the engines run for several minutes.Before disconnecting the jumper cables,
switch on an electrical consumer in your own
vehicle, e.g. the rear window defroster or the lighting.
When the starting assistance procedure is com-
plete:
First, remove the jumper cables from ground point 4 and the negative terminal of the
donor battery, then from positive contact 3
and the positive terminal of the donor battery. Begin each time with the contacts on your
own vehicle Nrst.Aser removing the jumper cables, close cover
2 of positive contact 3.Close cover 1.
Further information can be obtained at a qualiNed
specialist workshop.
Charging
Connect positive contact 3 of the vehicle to
the positive terminal of the charger using the charging cable. Always begin with positivecontact 3 of the vehicle.Connect the negative terminal of the charger
and ground 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 ground
point 4 and the negative terminal of the
charger, then from positive contact 3 and
the positive terminal of the charger. Begin
each time with the contacts of the vehicle.Aser removing the charging cable, close cover
2 of positive contact 3.Close cover 1.330Breakdown assistance

Further information can be obtained at a qualiNed
specialist workshop.
Replacing the 12 V battery
Observe the notes on the 12 V battery (  page 325).
Mercedes-Benz recommends that you have the
12 V battery replaced at a qualiNed specialist
workshop, e.g. at an authorized Mercedes-Benz Center.
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 only 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.
Install 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.
Tow starting or towing away
Permitted towing methods (non plug-in hybrid)
*NOTE Damage from automatic braking
If one of the following functions is activated,
the vehicle will brake automatically in certain
situations:
= 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 towedin a car wash
Mercedes-Benz recommends transporting your vehicle 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 Damage to the vehicle due to tow-
ing away incorrectlyObserve the instructions and notes on
towing away.Breakdown assistance331

Vehicles with rear wheel drivePermitted towing methodsBoth axles on
the groundYes, for a maximum 31 miles
(50 km) at 31 mph (50 km/h)Front axle
raisedNoRear axle
raisedYes, if the steering wheel is
Nxed in the center position
with a steering wheel lock
4MATIC vehicles
Permitted towing methodsBoth axles on
the groundYes, for a maximum 31 miles
(50 km) at 31 mph (50 km/h)Front axle
raisedNoRear axle
raisedNo
Towing with a raised axle: towing should be per-
formed by a towing company.
Towing the vehicle with both axles on the groundObserve the notes on the permitted towing methods.Make sure that the battery is connected and
charged.
Observe the following points when the battery is
discharged:
= the vehicle cannot be started.
= the electric parking brake cannot be released
or applied
= Vehicles with automatic transmission: the
transmission cannot be shised to position \\
or ] .
\bVehicles with automatic transmission: if the
transmission cannot be shised to position \\
or if the display does not show anything,
transport the vehicle (  page 333). A towing
vehicle with lising equipment is required for
vehicle transportation.*NOTE Damage due to towing away at
excessively high speeds or over long dis-
tances
The drivetrain could be damaged when towing
at excessively high speeds or over long distan-
ces.
A towing speed of 30 mph (50 km/h)
must not be exceeded.A towing distance of 30 miles (50 km)
must not be exceeded.&WARNING Risk of accident when towing a
vehicle which is too heavy
If the vehicle to be tow-started or towed away
is heavier 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 rollover.
Before tow-starting or towing away,
check if the vehicle to be tow-started or332Breakdown assistance

towed away exceeds the permissible
gross mass.If a vehicle has to be tow-started or towed away, its permissible gross mass must not exceed thepermissible gross mass of the towing vehicle.Information on the permissible gross mass of
the vehicle can be found on the vehicle identi-
Ncation plate ( page 372).Vehicles with automatic transmission: do not
open the driver\bs door or front passenger
door; the transmission otherwise automati-
cally shiss to position ].Install the towing eye (  page 335).Fasten the towing device.*NOTE Damage due to incorrect connec-
tion of the tow barOnly connect the tow rope or tow bar to
the towing eyes.Deactivate the automatic locking mechanism
(  page 69).Do not activate the HOLD function.Deactivate tow-away alarm (  page 87).Deactivate Active Brake Assist (  page 207).Vehicles with automatic transmission: shis to
position \\.Release the electric parking brake.&WARNING Risk of accident due to limited
safety-related functions during the towing
process
Safety-related functions are limited or no lon-
ger available in the following situations:
= The vehicle is switched oM.
= The brake system or power steering sys-
tem 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.Make sure that the steering wheel can
move freely before towing the vehicle
away.*NOTE Damage due to excessive tractive
power
If you pull away sharply, the tractive power
may be too high and the vehicles could be
damaged.
Pull away slowly and smoothly.
Loading the vehicle for transport
Observe the notes on towing away (  page 332).Connect the towing device to the towing eye
in order to load the vehicle.Shis the automatic transmission to position
\\ .Breakdown assistance333

\bThe automatic transmission may be locked inposition ] in the event of damage to the
electrics. To shis to \\, provide the on-board
electrical system with power (  page 329).Load the vehicle onto the transporter.Shis the automatic transmission to position
] .Use the electric parking brake to secure the
vehicle against rolling away.Only secure the vehicle by the wheels.
4MATIC vehicles/vehicles with automatic trans-
mission
Make sure that the front and rear axles come
to rest on the same transportation vehicle.*NOTE Damage to the drive train due to
incorrect positioning of the vehicleDo not position the vehicle above the
connection point of the transport vehi- cle.
Towing eye storage location
Plug-in hybrid
Towing eye 1 is located in a holder in the cargo
compartment on the les.
Not plug-in hybrid
Towing eye 1 is located under the trunk Ooor in
the loading sill.
Depending on the vehicle equipment, the towing
eye will be in a diMerent position in the trunk.
334Breakdown assistance

Installing and removing the towing eyePress the mark on cover 1 inwards and
remove.Depending on the vehicle version, use a tool (such as a screwdriver) to pry the cover out of
recess 2.Screw in the towing eye clockwise as far as it
will go and tighten.Make sure that cover 1 engages in the
bumper when you remove the towing eye.*NOTE Damage 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
recover a vehicle, the vehicle may be damaged
in the process.
Only use the towing eye or trailer hitch to
tow away or tow start the vehicle.Do not use the towing eye or trailer hitch
to tow the vehicle during recovery.
Tow-starting the vehicle
Vehicles with automatic transmission
*NOTE Damage to the automatic transmis-
sion 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 started.Vehicles with automatic transmissions must
not be tow-started.Breakdown assistance335

Electrical fuses
Notes on electrical fuses
&WARNING Risk of accident and injury due
to overloaded lines
If you manipulate or bridge a faulty fuse or if
you 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 new fuses containing the correct
amperage.*NOTE Damage due to incorrect fuses
Using incorrect fuses can result in damage to
electrical components or systems or their functions being considerably restricted.
Use only fuses approved for Mercedes-
Benz with the respective speciNed fuse
rating.
Blown fuses must be replaced with fuses of the
same rating, which you can recognize by the color
and the label. The fuse ratings and further infor-
mation to be observed can be found in the fuse
assignment diagram.
Fuse assignment diagram: on the fuse box in the
trunk (  page 338).*NOTE Damage or malfunctions caused by
moisture
Moisture may cause damage to the electrical
system or cause it to malfunction.
When the fuse box is open, make sure
that no moisture can enter the fuse box.When closing the fuse box, make sure
that the seal of the lid is positioned cor-
rectly on the fuse box.
If the newly inserted fuse also blows, have the cause traced and rectiNed at a qualiNed specialist
workshop.
Ensure the following before replacing a fuse: = The vehicle is secured against rolling away.
= All electrical consumers are switched oM.
= The vehicle is switched oM.
The electrical fuses are located in various fuse
boxes:
= Fuse box in the engine compartment on the
driver\bs side (  page 336)
= Fuse box on the driver\bs side of the cockpit
(  page 337)
= Fuse box in the front passenger footwell
(  page 338)
= Fuse box in the trunk (  page 338)
Opening and closing the fuse box in the engine
compartment
Requirements: = A dry cloth and a screwdriver are available.
Observe the notes on electrical fuses
(  page 336).
336Breakdown assistance

Opening&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.Turn both retaining clips 2 on cover 1 on
the driver\bs side a quarter-turn clockwise.Fold cover 1 upwards.Remove any existing moisture from the fuse
box using a dry cloth.Loosen screws 3 and remove fuse box lid 4
from the top.
Closing
Check whether the seal is positioned correctly
in lid 4.Insert lid 4 into the bracket at the rear of the
fuse box.Fold down lid 4 of the fuse box and tighten
screws 3.Fold down cover 1.Turn both retaining clips 2 on cover 1 a
quarter-turn counter-clockwise.Close the hood.
Opening and closing the fuse box in the cockpit
= Observe the notes on electrical fuses
(  page 336).
The fuse box is on the driver\bs side on the side of
the cockpit under a cover.
Mercedes-Benz recommends you have the fuse box opened at an authorized Mercedes-
Benz Center.Breakdown assistance337

Opening and closing the fuse box in the front
passenger footwell
Observe the notes on electrical fuses
(  page 336).
To open: fold out and remove cover 1.To close: reinsert cover 1.Opening and closing the fuse box in the trunk
Observe the notes on electrical fuses
(  page 336).
Open cover 1.338Breakdown assistance