2018-2026 Mercedes A Class 4 Door General notes -> Diagnostics connection User Manual
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General notes -> Diagnostics connection for Your Mercedes A Class 4 Door Third Generation (2018-2026)

General notes  
27  
ces may not cause harmful interference, and 2)  
These devices must accept any interference  
received, including interference that may cause  
undesired operation.Changes or modiꢀcations not  
expressly approved by the party responsible for  
compliance could void the user’s authority to  
operate the equipment."  
underbody paneling. These materials may  
ignite if they come into contact with hot parts  
of the exhaust system.  
Diagnosstics cconnecction  
The diagnostics connection is a technical inter-  
face in the vehicle. It is used, for example, in the  
context of repair and maintenance work or for  
reading out vehicle data in a specialist workshop.  
Diagnostic devices should therefore only be con-  
nected in a qualiꢀed specialist workshop.  
#
Have the vehicle checked and repaired  
immediately at a qualiꢀed specialist  
workshop.  
or  
Canada: "This vehicle contains licence-exempt  
transmitter(s)/receiver(s) that comply with Inno-  
vation, Science and Economic Development Can-  
ada’s licence-exempt RSS(s). Operation is subject  
to the following two conditions: (1) These devices  
may not cause interference. (2) These devices  
must accept any interference, including interfer-  
ence that may cause undesired operation of the  
devices." "Les émetteurs/récepteurs dans cette  
véhicule sont conforme aux CNR d’Innovation,  
Sciences et Développement économique Canada  
applicables aux appareils radio exempts de  
licence. Lexploitation est autorisée aux deux con-  
ditions suivantes : 1) Ces appareils ne doivent pas  
produire de brouillage; 2) Ces appareils doivent  
accepter tout brouillage radioélectrique subi,  
même si le brouillage est susceptible d’en com-  
promettre le fonctionnement."  
#
If driving safety is impaired while con-  
&
WARNING Risk of accident due to con-  
necting devices to the diagnostics con-  
nection  
tinuing your journey, pull over and stop  
the vehicle immediately, while paying  
attention to road and traꢁc conditions,  
and contact a qualiꢀed specialist work-  
shop.  
If you connect devices to the diagnostics con-  
nection of the vehicle, the function of vehicle  
systems and operating safety may be  
impaired.  
#
For safety reasons, we recommend that  
Declarationn of conformitty for wireless vehicle  
components  
you only use and connect products  
approved by your authorized Mercedes-  
Benz Center.  
USA: "Radio based devices of this vehicle comply  
with Part 15 of the FCC Rules. Operation is sub-  
ject to the following two conditions: 1) These devi-  
General notes  
28  
Connecting and using another device with the  
diagnostics connection can have the following  
eꢃects:  
#
&
If the charge level is low, charge the bat-  
tery, e.g. by driving a considerable dis-  
tance.  
WARNING Risk of accident due to objects  
in the driver's footwell  
Objects in the driver's footwell may impede  
pedal travel or block a depressed pedal.  
R
Malfunctions in the vehicle system  
Please also note the information about the 12 V  
battery and short-distance trips in the "Driving  
and Parking" chapter (/ page 132).  
R
Permanent damage to vehicle components  
This jeopardizes the operating and road safety  
of the vehicle.  
Please refer to the warranty terms and conditions  
for this matter.  
#
Stow all objects in the vehicle securely  
so that they cannot get into the driver's  
footwell.  
Moreover, connecting equipment to the diagnos-  
tics connection can lead to emissions monitoring  
information being reset, for example. This may  
lead to the vehicle failing to meet the require-  
ments of the next emissions inspection during the  
main inspection.  
#
Always install the ꢂoor mats securely  
and as prescribed in order to ensure that  
there is always suꢁcient room for the  
pedals.  
#
Do not use loose ꢂoor mats and do not  
place ꢂoor mats on top of one another.  
Qualiꢀed speciialisst workshop  
An authorized Mercedes-Benz Center is a quali-  
ꢀed specialist workshop. It has the necessary  
special skills, tools and qualiꢀcations to correctly  
carry out the work required on your vehicle. This  
particularly applies to safety-relevant works.  
*
NOTE Battery discharging from using devi-  
ces connected to the diagnostics connec-  
tion  
Using devices at the diagnostics connection  
drains the battery.  
#
Check the charge level of the battery.  

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