Page 232 of 353

X
Press the :or9 button to select the
Acoustic Lock function.
If the Acoustic Lock function is activated,
the & symbol in the multifunction dis-
play lights up red.
X Press the abutton to save the setting.
Activating/deactivating the radar sensor
system
i You must deactivate the radar sensor sys-
tem in certain countries and near radio
telescope facilities. For further informa-
tion, see (Y page 345).
Vehicles with anavigation system: the radar
sensor system is deactivated automatically if
you are close to radio telescope facilities.
The following systems are switched off when
the radar sensor system is deactivated:
R DISTRONIC PLUS (Y page 171)
R BAS PLUS (Y page 62)
R PRE-SAFE ®
Brake (Y page 66)
R Blind Spot Assist (Y page 196)
R Active Blind Spot Assist (Y page 199)
X Press the =or; button on the steer-
ing wheel to select the Settings menu.
X Press the :or9 button to select the
Vehicle submenu.
X Press the abutton to confirm.
X Press the 9or: button to select
Radar sensor (See Owner's Man.): .
You will see the selected setting: on or
off .
X Press the abutton to save the setting.
Heating menu Auxiliary heating departuret
ime
This function is only availabl eonvehicles with
auxiliary heating (Y page 137).
In the Heating submenu, you can select a
stored departure time or change adeparture
time. The auxiliary heating timer function calcu-
lates the switch-on time accordin
gtothe out-
side temperature so that the vehicle is pre-
heated by the departure time. When the
departure time is reached, the auxiliary heat-
ing continues to heat for afurther five
minutes and then switches off. The auxiliary
heating adopts the THERMATIC or
THERMOTRONIC temperature setting.
You can switch off the auxiliary heating by
using the remot econtrol or the auxiliary heat-
ing button on the centre console. G
WARNING
Exhaust fumes are produced when the auxili-
ary heating is in operation. Inhaling these
exhaust fumes can be poisonous. You should
therefore switch off the auxiliary heating in
confined spaces without an extraction sys-
tem, e.g. agarage. G
WARNING
When operating the auxiliary heating parts of
the vehicle can get very hot. Make sure that
the exhaust system does not under any cir-
cumstances come into contact with easily
ignitable material such as dry grass or fuels.
The material could otherwise ignite and set
the vehicle alight. Choose your parking spot
accordingly.
Operating the auxiliary heating is thus pro-
hibited at filling station sorwhen your vehicle
is being refuelled. You must therefore switch
off the auxiliary heating at filling stations.
! Operating the auxiliary heating/ventila-
tion draws on the vehicle battery. After you
have heated or ventilated the vehicle a
maximum of two times, drive for alonger
distance.
i Switc hthe auxiliary heating on regularly
once amonthfor about 10 minutes. Menus and submenus
229On-board computer and displays Z
Page 248 of 353

Display messages Possible causes/consequences and
M Solutions
Radar sensor
deactivated autom.
See Owner'
sManual Vehicles wit
hanavigation system: th evehicl eisc lose to aradio
telescope facilit yand is therefore prohibite dfromt ransmitting any
rada rsignals .The radar sensor system has switched off automat-
ically (Y page 345).
DISTRONIC PLUS (Y page 171) is deactivated automatically if it is
activated. Awarning tone also sounds.
Blin dSpotA ssist (Y page 196) or Active Blind Spot Assist
(Y page 199) is deactivated automaticallyifitisa ctivated. The
yellow 9indicator lamps also light up in the exterior mirrors.
BAS PLUS (Brake Assist PLUS) (Y page 62) and PRE-SAFE®
Brake
(Y page 66) are also not available.
X Drive on.
Once you have moved far enough awayf rom the radio telescope,
the above functionsa re available again.Radar sensor
deactivated See
Owner's Manual The radar sensor system is deactivated.
X
Check whether or not the radar sensor system may be activated
(Y page 345).
X Switch on the radar sensor system (Y page 229).Lane Keeping
Assist currently
unavailable See
Owner's Manual or
Active Lane Keep‐ ing Assist cur‐
rently unavailable
See Owner's Manual Lane Keeping Assist or Active Lane Keeping Assist is deactivated
and temporarily inoperative if:
R the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
R there are no lane markings for alonger period.
R the lane markings are worn, dark or covered, for example by dirt
or snow.
Lane Keeping Assist or Active Lane Keeping Assist is operational
againa nd the display message disappears if:
R the dirt (e.g. slush) drops away whil ethe vehicl eisinmotion.
R the system detects tha tthe camera is fully operational again.
If the displaym essage continues to be displayed:
X Cleant he windscreen. Lane Keeping
Assist inoperative
or
Active Lane Keeping Assist
inoperative Lane Keeping Assist or Active Lane Keeping Assist is faulty.
X
Visit aqualified specialist workshop. Display messages
245On-board computer and displays Z
Page 348 of 353

Permissible rear axle load when towing
atrailer Coupé Cabriolet
Manual trans-
mission Automatic
transmission Manual trans-
mission Automatic
transmission E2
0059 1135 kg 1145 kg 1205 kg 1215 kg
E2
5059 – 1155 kg – 1225 kg
E3
0059 – 1175 kg – 1245 kg
E3
5059 – 1175 kg – 1245 kg
E5
0059 – 1190 kg – 1260 kg
E2
20 CDI 59 1155 kg 1160 kg 1225 kg 1230 kg
E2
50 CDI 59 1170 kg 1170 kg 1240 kg 1240 kg
E3
50 CDI 59 – 1175 kg – 1250 kg
24-GHz radar sensor syste
m(coun try overview)
Th e24G Hz radar sensor system requires separate approval for each country. When you are
driving in acountry in whic hthe radar sensor system is no tapproved, you must deactivate
the system using the on-board computer (Y page 229). The currentcountry overview can be
obtaine dfrom aMercedes-Benz Service Centre.
Vehicles with anavigation system: the radar sensor system is deactivated automatically
near radio telescope facilities.
The currently active systems are automatically deactivated:
R DISTRONI CPLUS (Y page171)
R Blind Spot Assist (Y page196)
R PRE-SAFE ®
Brake (Y page45)
Ad isplay message appears in the multifunction display to tell you that the radar sensor system
is being switched off (Y page 245).
BA SP LUS (Y page 62) is the nalso unavailable.
If the deactivation does not occur automatically, you must deactivat ethe radar sensor system
using the on-board computer (Y page 229).
Vehicles withou tnavigation and vehicles for Australia: you must deactivate the radar
sensor system using the on-board computer whe nyou are near aradio telescope facility
(Y page 229).
59 BlueEFFICIENCY 24-GHz radar sensor system (countryo
verview)
345Technical data Z