2012-2017 Mercedes A Class 4 Door Technical data -> Vehicle electronics User Manual
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Technical data -> Vehicle electronics for Your Mercedes A Class 4 Door Third Generation (2012-2017)

Vehicle electronics  
394  
Useful information  
tional safety of the vehicle. There is a risk of an  
accident.  
i This Owner's Manual describes all mod-  
els, series and optional equipment for your  
vehicle that were available at the time of  
going to press. National variations are pos-  
sible. Note that your vehicle may not be  
equipped with all of the functions descri-  
bed. This is also the case for systems and  
functions relevant to safety.  
You should have all work on electrical and  
electronic components carried out at a quali-  
fied specialist workshop.  
WARNING  
G
If you operate RF transmitters incorrectly in  
the vehicle, the electromagnetic radiation  
could interfere with the vehicle electronics,  
e.g.:  
i Read the information on qualified special-  
ist workshops: (Y page 24).  
R
if the RF transmitter is not connected to an  
exterior aerial  
R
the exterior aerial has been fitted incor-  
Information on technical data  
rectly or is not a low-reflection type  
This could jeopardise the operating safety of  
the vehicle. There is a risk of an accident.  
i The technical data was determined in  
accordance with EU Directives. All data  
applies to the vehicle's standard equip-  
ment. The data may therefore differ for  
vehicles with optional equipment. You can  
obtain further information from a  
Have the low-reflection exterior aerial fitted at  
a qualified specialist workshop. When oper-  
ating RF transmitters in the vehicle, always  
connect them to the low-reflection exterior  
aerial.  
Mercedes-Benz Service Centre.  
! The operating permit may be invalidated if  
the instructions for installation and use of  
RF transmitters are not observed.  
In particular, the following conditions must  
be complied with:  
Vehicle electronics  
Tampering with the engine electron-  
ics  
R
only approved wavebands may be used.  
observe the maximum permissible out-  
put in these wavebands.  
only approved aerial positions may be  
! Only have work carried out on the engine  
electronics and its associated parts, such  
as control units, sensors, actuating com-  
ponents and connector leads, at a qualified  
specialist workshop. Vehicle components  
may otherwise wear more quickly and the  
vehicle's operating permit may be invalida-  
ted.  
R
R
used.  
Excessive levels of electromagnetic radiation  
may cause damage to your health and to the  
health of others. The use of an exterior aerial  
takes into consideration the scientific discus-  
sion surrounding the possible health risk  
posed by electromagnetic fields.  
Retrofitting two-way radios and  
mobile phones (RF transmitters)  
Observe the notes on operating mobile  
phones (Y page 318).  
WARNING  
G
If RF transmitters are tampered with or not  
properly retrofitted, the electromagnetic radi-  
ation they emit can interfere with the vehicle  
electronics. This may jeopardise the opera-  
The following aerial positions may be used for  
the correct installation of RF transmitters:  
Vehicle electronics  
395  
The maximum transmission output (PEAK) at  
the base of the aerial must not exceed the  
following values:  
Waveband  
Maximum  
transmission  
output  
Short wave  
3 - 54 MHz  
100 W  
30 W  
50 W  
10 W  
35 W  
10 W  
4 m waveband  
74 - 88 MHz  
Approved aerial positions  
:
Front roof area  
2 m waveband  
144 - 174 MHz  
;
Rear roof area  
=
Rear wing  
i On vehicles with panorama sliding sun-  
roof, fitting an aerial to the front or rear roof  
area is not permitted.  
On the rear wing, it is recommended that  
you position the aerial on the side of the  
vehicle closest to the centre of the road.  
Trunked radio/Tetra  
380 - 460 MHz  
70 cm waveband  
400 - 460 MHz  
Mobile communications  
(2G/3G/4G)  
Use Technical Specification ISO/TS 21609  
(Road Vehicles – "EMC guidelines for fitting  
aftermarket radio frequency transmitting  
equipment") when retrofitting RF (radio fre-  
quency) transmitters. Comply with the legal  
requirements for add-on parts.  
If your vehicle has fittings for two-way radio  
equipment, use the power supply or aerial  
connections intended for use with the basic  
wiring. Be sure to observe the manufacturer's  
additional instructions when installing.  
The following can be used in the vehicle with-  
out restrictions:  
R
RF transmitters with a maximum transmis-  
sion output of up to 100 mW  
R
RF transmitters with transmitter frequen-  
cies in the 380 - 410 MHz waveband and a  
maximum transmission output of up to 2 W  
(trunked radio/Tetra)  
R
Mobile telephones (2G/3G/4G)  
Deviations with respect to wavebands, maxi-  
mum transmission outputs or aerial positions  
must be approved by Mercedes-Benz.  
There are no restrictions when positioning the  
aerial on the outside of the vehicle for the fol-  
lowing wavebands:  
R
Trunked radio/Tetra  
R
70 cm waveband  
R
2G/3G/4G  
Z

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