2025-2026 Mercedes CLA 4 Door General notes -> Diagnostics connection User Manual
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General notes -> Diagnostics connection for Your Mercedes CLA 4 Door Third Generation (2025-2026)

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-
ces may not cause harmful interference, and 2)
These devices must accept any interference
received, including interference that may cause
undesired or modications not
expressly approved by the party responsible for
compliance could void the user’s authority to
operate the equipment."
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. L’exploitation 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."
Diagnostics connection
The diagnostics connection is a technical inter-
face in the vehicle. It is used, for example, during
repair and maintenance work or for reading out
vehicle data in a specialist workshop. Diagnostic
devices should therefore only be connected in a
qualied specialist workshop.
&
WARNING Risk of accident due to con-
necting devices to the diagnostics con-
nection
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
you use and connect only products
approved by an authorized Mercedes-
Benz Service Center.
&
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.
This jeopardizes the operating and road safety
of the vehicle.
#
Stow all objects in the vehicle securely
so that they cannot get into the driver's
footwell.
#
Always install the oor mats securely
and as prescribed in order to ensure that
there is always sucient room for the
pedals.
#
Do not use loose oor mats and do not
place oor mats on top of one another.
*
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.
26
General notes
#
If the charge level is low, charge the bat-
tery, e.g. by driving a considerable dis-
tance.
Please also note the information about the 12 V
battery and short-distance trips in the "Driving
and Parking" chapter (/ page 140).
Connecting and using another device with the
diagnostics connection can have the following
eects:
R
Malfunctions in the vehicle system
R
Permanent damage to vehicle components
Please refer to the warranty terms and conditions
for this matter.
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.
Qualied specialist workshop
An authorized Mercedes-Benz Service Center is a
qualied specialist workshop. It has the necessary
special skills, tools and qualications to correctly
carry out the work required on your vehicle. This
particularly applies to safety-relevant work.
For the following, always have your vehicle
checked at an authorized Mercedes-Benz Service
Center:
R
Safety-relevant work
R
Service and maintenance work
R
Repair work
R
Modications as well as installations and con-
versions
R
Work on electronic components
R
Vehicles with 48 V on-board electrical system:
work on the high-voltage component of the 48
V on-board electrical system
Mercedes‑Benz recommends a Mercedes‑Benz
Service Center.
Correct use of the vehicle
If you remove any warning stickers, you or others
could fail to recognize certain dangers. Leave
warning stickers in position.
General notes
27

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