2025-2026 Mercedes CLA 4 Door Technical data -> Vehicle electronics User Manual
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Technical data -> Vehicle electronics for Your Mercedes CLA 4 Door Third Generation (2025-2026)

Notes on technical data
*
NOTE Mercedes-AMG vehicles
#
Observe the notes in the Supplement.
You could otherwise fail to recognize
dangers.
The data stated only applies to vehicles with
standard equipment. You can obtain further infor-
mation from an authorized Mercedes-Benz Cen-
ter.
Vehicle electronics
Two-way radios
▌Notes on installing two-way radios
&
WARNING Risk of accident due to
improper work on two-way radios
If two-way radios are manipulated or retrot-
ted incorrectly, the electromagnetic radiation
from the two-way radios can interfere with the
vehicle electronics and jeopardize the operat-
ing safety of the vehicle.
#
You should have all work on electrical
and electronic components carried out
at a qualied specialist workshop.
&
WARNING Risk of accident due to
improper operation of two-way radios
If you use two-way radios in the vehicle
improperly, their electromagnetic radiation
can disrupt the vehicle's electronics. This is
the case in the following situations, in particu-
lar:
R
The two-way radio is not connected to an
exterior antenna.
R
The exterior antenna is installed incor-
rectly or is not a low-reection antenna.
This could jeopardize the operating safety of
the vehicle.
#
Have the low-reection exterior antenna
installed at a qualied specialist work-
shop.
#
When operating two-way radios in the
vehicle, always connect them to the low-
reection exterior antenna.
*
NOTE Invalidation of the operating permit
due to failure to comply with the instruc-
tions for installation and use
The operating permit may be invalidated if the
instructions for installation and use of two-way
radios are not observed.
#
Only use approved frequency bands.
#
Observe the maximum permissible out-
put power in these frequency bands.
#
Only use approved antenna positions.
346
Technical data
1
Rear roof area
On vehicles with a panorama roof with power tilt/
sliding panel, installing an antenna is not permit-
ted.
Use Technical Specication ISO/TS 21609 (Road
Vehicles – "EMCs for installation of aermarket
radio frequency transmitting equipment") when
retrotting two-way radios. Comply with the legal
requirements for detachable parts.
If your vehicle has a pre-installation for two-way
radio equipment, use the power supply and
antenna connectors provided in the pre-installa-
tion. Observe the manufacturer's supplements
during installation.
▌Two-way radio transmission output
The maximum transmission output (PEAK) at the
base of the antenna must not exceed the values in
the following table.
Frequency band and maximum transmission out-
put
Frequency band Maximum transmis-
sion output
2 m frequency band
144–174 MHz
50 W
Terrestrial Trunked
Radio (TETRA)
380–460 MHz
10 W
Frequency band Maximum transmis-
sion output
Two-way radio
2G
2 W
Two-way radio
3G/4G/5G
0.5 W
The following can be used in the vehicle without
restrictions:
R
two-way radios with a maximum transmission
output of 100 mW
R
two-way radios with transmitter frequencies in
the 380–410 MHz frequency band and a maxi-
mum transmission output of 2 W (TETRA)
R
mobile phones (2G/3G/4G/5G)
There are no restrictions regarding the position of
the antenna on the outside of the vehicle for the
following frequency bands:
R
Terrestrial Trunked Radio (TETRA)
R
2G/3G/4G/5G
Technical data
347
Radio regulations
Regulatory radio identication and specic notes
Manufacturer information about radio-based vehi-
cle components can be found using the key
phrase "Regulatory information" in the Digital
Operator's Manual in the vehicle, on the Internet
and in the app.
Further information and updates are available at
the following web address:
regulatoryr.net/us
Information about the specic absorption rate
(SAR)
Information on the specic absorption rate (SAR)
can be found under the key word "Regulatory
information" in the vehicle's Digital Operator's
Manual, on the Internet and in the app.
Further information and updates are available at
the following web address:
regulatoryr.net/us
Vehicle identication plate, VIN and engine num-
ber overview
Vehicle identication plate
348
Technical data

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