2014-2021 Mercedes C Class 4 Door General notes -> Operating safety User Manual
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General notes -> Operating safety for Your Mercedes C Class 4 Door Fourth Generation (2014-2021)

General notes 23  
Always specify the vehicle identification number  
(VIN) (/ page 427) when ordering Mercedes-  
Benz GenuineParts.  
Operating safety  
networked components or safety-relevant  
systems.  
NOTE Plug-in hybrid  
*
This can endanger the vehicle's operating  
safety.  
#
Observe the notes in the Supplement.  
You could otherwise fail to recognise  
dangers.  
Owner's Manual  
#
You must not tamper with wiring, elec‐  
tronic components, or their software.  
This Owner's Manual describes all models and  
all standard and optional equipment available for  
your vehicle at the time of this Owner's Manual  
going to press. Country-specific differences are  
possible. Note that your vehicle may not be fit‐  
ted with all features described. This is also the  
case for systems and functions relevant to  
safety. Therefore, the equipment on your vehicle  
may differ from that in the descriptions and illus‐  
trations.  
The original purchase agreement for your vehicle  
contains a list of all of the systems in your vehi‐  
cle.  
Should you have any questions concerning  
equipment and operation, please consult a  
Mercedes-Benz Service Centre.  
#
Always have work on electrical and  
&
WARNING Risk of injury due to malfunc‐  
tions or system failure  
electronic devices carried out at a quali‐  
fied specialist workshop.  
In order to avoid malfunctions or system fail‐  
ures:  
If you modify the on-board electronics, the gen‐  
eral operating permit is rendered invalid.  
Observe the "On-board electronics" section in  
"Technical data".  
#
Always have the specified service/  
maintenance work as well as any nec‐  
essary repairs carried out at a qualified  
specialist workshop.  
&
WARNING Risk of fire due to flammable  
materials on hot parts of the exhaust  
system  
&
WARNING Risk of accident or injury due  
to improper modifications to electronic  
components  
Flammable material such as leaves, grass or  
twigs may ignite if they come into contact  
with hot parts of the exhaust system.  
Modifications to electronic components,  
their software or wiring can impair their func‐  
tionality and/or the functionality of other  
The Owner's Manual and Service Booklet are  
important documents and should be kept in the  
vehicle.  
24 General notes  
Vehicles with a 48 V on-board electrical sys‐  
tem (EQ Boost technology)  
#
When driving on unpaved roads or off-  
road, regularly check the vehicle under‐  
side.  
Remove trapped plants or other flam‐  
mable material, in particular.  
If there is damage, consult a qualified  
specialist workshop immediately.  
way can unexpectedly fail or, in the case of  
an accident, may not absorb the loads that  
arise as intended.  
If the underbody panelling is damaged, flam‐  
mable materials such as leaves, grass or  
twigs can collect between the underbody and  
the underbody panelling. These materials  
may ignite if they come into contact with hot  
parts on the exhaust system.  
&
DANGER Risk of fatal injury by touching  
damaged high-voltage components  
#
#
Vehicles with a 48 V on-board electrical sys‐  
tem contain individual high-voltage compo‐  
nents. These high-voltage components are  
under high voltage.  
If you modify component parts of these high-  
voltage components or touch damaged com‐  
ponent parts, you may be electrocuted.  
NOTE Damage to the vehicle  
*
#
Have the vehicle checked and repaired  
In the following situations, in particular, there  
is a risk of damage to the vehicle:  
immediately at a qualified specialist  
workshop.  
R
High voltage components may be damaged  
in an accident, although the damage may not  
be visible.  
the vehicle becomes grounded, e.g. on a  
high kerb or an unpaved road  
the vehicle is driven too fast over an  
obstacle, e.g. a kerb, speed bump or pot‐  
hole  
or  
#
If driving safety is impaired while con‐  
R
tinuing your journey, pull over and stop  
the vehicle immediately in accordance  
with the traffic conditions, and contact  
a qualified specialist workshop.  
#
Never perform modifications to compo‐  
nent parts of high-voltage components.  
#
R
Never touch damaged component parts  
of high-voltage components.  
a heavy object strikes the underbody or  
chassis components  
#
Never touch component parts of high-  
voltage components after an accident.  
In situations such as this, the body, the  
underbody, chassis components, wheels or  
tyres could be damaged without the damage  
being visible. Components damaged in this  

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