2012 MERCEDES-BENZ A-CLASS HATCHBACK mirror

Indicator and warning display
Blind Spot Assist is not active at speeds below
approximately 30 km/h. Vehicles in the mon-itoring range are then not indicated. :
Yellow indicator lamp/red warning lamp
If Blind Spot Assist is switched on, indicator
lamp :in the exterior mirrors lights up yel-
low up to a speed of 30 km/h. At speeds
above 30 km/h, the indicator lamp goes out
and Blind Spot Assist is operational.
If a vehicle is detected within the monitoring
range of Blind Spot Assist at speeds above
30 km/h, warning lamp :on the corre-
sponding side lights up in red. This warning
always occurs when a vehicle enters the blind
spot monitoring range from behind or from
the side. When you overtake a vehicle, the
warning only occurs if the difference in speed is less than 12 km/h.
The yellow indicator lamp goes out if reversegear is engaged. Blind Spot Assist is then
deactivated.
The brightness of the indicator/warning
lamps is adjusted automatically according to
the ambient light.
Collision warning
If a vehicle is detected in the monitoring range
of Blind Spot Assist and you switch on the
corresponding turn signal, a double warning
tone sounds. Red warning lamp :flashes. If
the turn signal remains on, detected vehicles
are indicated by the flashing of red warning
lamp :. There are no further warning tones. Activating Blind Spot Assist
X Make sure that the radar sensor system
(Y page 223) and Blind Spot Assist
(Y page 219) are activated in the on-board
computer.
X Turn the key to position 2in the ignition
lock.
Warning lamps :in the exterior mirrors
light up red for approximately 1.5 seconds
and then turn yellow.
Towing a trailer
If you attach a trailer, make sure that you have
correctly established the electrical connec-
tion. This can be accomplished by checking
the trailer lighting. Blind Spot Assist is then
deactivated. The indicator lamp lights up yel-
low in the exterior mirrors and the Blind
Blind
Spot Assist currently unavailable Spot Assist currently unavailable
See Owner's Manual See Owner's Manual message appears in
the multifunction display.
i You can deactivate the indicator lamps in
the exterior mirrors.
To do so, switch off Blind Spot Assist if:
R the key is in position 2in the ignition
lock.
R the engine is not running.
R the electrical connection to the trailer
has been established.
Lane Keeping Assist General notes
Lane Keeping Assist monitors the area in
front of your vehicle by means of a camera at
the top of the windscreen. Lane Keeping
Assist detects lane markings on the road and
warns you before you leave your lane unin-
tentionally. Driving systems
199Driving and parking Z

qualified specialist workshop, e.g. a
Mercedes-Benz Service Centre.
Switching Adaptive Highbeam Assist on/
off
This function is only available on vehicles with
the Intelligent Light System.
X Press the =or; button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Lights
Lights submenu.
X Press ato confirm.
X Press the :or9 button to select the
Adapt. main beam
Adapt. main beam function.
If the Adapt. main beam
Adapt. main beam function has
been switched on, the cone of light and the _ symbol in the multifunction display
are shown in orange.
X Press the abutton to save the setting.
For further information about Adaptive High-
beam Assist, see (Y page 109).
Setting the brightness of the ambient
lighting
X Press the =or; button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Lights
Lights submenu.
X Press ato confirm.
X Press the :or9 button to select the
Amb. light +/-
Amb. light +/- function.
You will see the selected setting.
X Press ato confirm.
X Press the :or9 button to adjust the
brightness to any level from Off
Off toLevel 5Level 5
(bright).
X Press the aor% button to save the
setting.
Activating/deactivating the surround
lighting and exterior lighting delayed
switch-off
If you have activated the Surround light‐
Surround light‐
ing
ing function and the light switch is set to
Ã, the following functions are activated
when it is dark: R
surround lighting: the exterior lighting
remains lit for 40 seconds after unlocking
with the key. If you start the engine, the
surround lighting is switched off and auto-
matic headlamp mode is activated
(Y page 105).
R exterior lighting delayed switch-off: the
exterior lighting remains lit for 60 seconds
after the engine is switched off. If you close all the doors and the tailgate, the exterior
lighting goes off after 15 seconds.
X Press the =or; button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Lights
Lights submenu.
X Press ato confirm.
X Press the :or9 button to select the
Surround lighting
Surround lighting function.
When the Surround lighting
Surround lighting function is
activated, the light cone and the area
around the vehicle are displayed in orange
in the multifunction display.
X Press the abutton to save the setting.
Deactivating delayed switch-off of the exte-
rior lighting temporarily: X Before leaving the vehicle, turn the key to
position 0in the ignition lock.
X Turn the key to position 2in the ignition
lock.
The exterior lighting delayed switch-off is
deactivated.
Delayed switch-off of the exterior lighting is
reactivated the next time you start the
engine.
i Depending on your vehicle's equipment,
when the surround lighting and delayed
switch-off exterior lighting are on, the fol-
lowing light up:
R side lamps
R foglamps
R dipped-beam headlamps
R daytime driving lights
R surround lighting in the exterior mirrors 222
Menus and submenusOn-board computer and displays

Flammable material such as leaves, grass or
twigs may ignite if they come into contact with hot parts of the exhaust system for extended periods. There is a risk of fire.
When the auxiliary heating is switched on,
make sure that no flammable material can
come into contact with hot vehicle compo-
nents.
! 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 a longer
distance.
i Switch the auxiliary heating on regularly
once a month for about ten minutes.
Comfort Switching belt adjustment on/off
X Press the =or; button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Convenience
Convenience submenu.
X Press ato confirm.
X Press the :or9 button to select the
Belt adjustment
Belt adjustment function.
If the Belt adjustment
Belt adjustment function is activa-
ted, the vehicle seat belt is shown in orange
in the multifunction display.
X Press the abutton to save the setting.
For further information on belt adjustment,
see (Y page 47).
Switching the fold in mirrors when lock-
ing function on/off
This function is only available on vehicles with
a memory function (Y page 101).
When you activate the Auto.
Auto. fold-in fold-in mir‐
mir‐
rors
rors function, the exterior mirrors are folded
in when the vehicle is locked.
When you unlock the vehicle and then open a door, the exterior mirrors fold out again.
If you have switched on the Auto. Auto.fold-in
fold-in
mirrors
mirrors function and you fold in the exterior mirrors using the button on the door
(Y
page 99), they will not fold out automati-
cally. The exterior mirrors can then only be
folded out using the button on the door.
X Press the =or; button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Convenience
Convenience submenu.
X Press ato confirm.
X Press the :or9 button to select the
Auto. fold-in mirrors
Auto. fold-in mirrors function.
If the Auto.
Auto. fold-in
fold-in mirrors
mirrorsfunction is
activated, the vehicle's exterior mirror is
displayed in orange in the multifunction
display.
X Press the abutton to save the setting.
Resetting to factory settings X
Press the =or; button on the steer-
ing wheel to select the Settings Settingsmenu.
X Press the :or9 button to select the
Factory setting
Factory setting submenu.
X Press ato confirm.
The Reset all settings?
Reset all settings? message
appears.
X Press the :or9 button to select No
No
or Yes
Yes.
X Press the abutton to confirm the selec-
tion.
If you have selected Yes Yes, the multifunction
display shows a confirmation message.
For safety reasons, not all functions are reset: the Limit speed (winter tyres):
Limit speed (winter tyres): func-
tion in permanent SPEEDTRONIC can only be
set in the VEHICLE VEHICLEsubmenu. If you want to
reset the Daytime driving lights: Daytime driving lights: in the
Light
Light submenu, you must turn the key in the
ignition lock to position 1. Menus and submenus
225On-board computer and displays Z

Display messages
Possible causes/consequences and
M
MSolutions b
Trailer left indi‐ Trailer left indi‐
cator cator
orTrailer
Trailer
right indicator
right indicator The left or right-hand trailer turn signal lamp is faulty.
X Check whether you are permitted to replace the bulb yourself.
or
X Visit a qualified specialist workshop. b
Trailer brake lamp Trailer brake lamp The trailer brake lamp is faulty.
X Check whether you are permitted to replace the bulb yourself.
or
X Visit a qualified specialist workshop. b
Rear left indica‐ Rear left indica‐
tor tor
orRear right
Rear right
indicator
indicator The rear left-hand or rear right-hand turn signal is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 112).
or
X Visit a qualified specialist workshop. b
Front left indica‐ Front left indica‐
tor tor
orFront right
Front right
indicator
indicator The front left-hand or front right-hand turn signal is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 112).
or
X Visit a qualified specialist workshop. b
Left Left
mirror
mirror indica‐
indica‐
tor
tor orRight mir‐
Right mir‐
ror indicator
ror indicator The turn signal in the left-hand or right-hand exterior mirror is
faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 112).
or
X Visit a qualified specialist workshop. b
Third brake lamp Third brake lamp The third brake lamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 112).
or
X Visit a qualified specialist workshop. b
Left brake lamp Left brake lamp
or
Right brake lamp
Right brake lamp The left or right-hand brake lamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 112).
or
X Visit a qualified specialist workshop. 240
Display
messagesOn-board computer and displays

Display messages
Possible causes/consequences and
M
MSolutions Speed Limit Assist
Speed Limit Assist
Currently unavail‐ Currently unavail‐
able See Owner's able See Owner's
Manual Manual Speed Limit Assist is deactivated and temporarily inoperative.
Possible causes:
R the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
X Clean the windscreen.
If the system detects that the camera is fully operational, the dis-
play message disappears.
Speed Limit Assist is operational again. Speed Speed
Limit
LimitAssist:
Assist:
Unavailable in
Unavailable in
this country this country Speed Limit Assist is only available in certain countries.
X Drive on.
Speed Limit Assist is available again as soon as you drive into a
country in which its use is approved. Speed Speed
Limit
LimitAssist
Assist
inoperative
inoperative Speed Limit Assist is faulty.
X Visit a qualified specialist workshop. ë
Off Off The HOLD function is deactivated. the vehicle is skidding.
A warning tone also sounds.
X Reactivate the HOLD function later (Y page 179). The HOLD function is deactivated. When the brake pedal is firmly
depressed, an activation condition is not fulfilled.
A warning tone also sounds.
X Check the activation conditions for the HOLD function
(Y page 179). Radar sensor deac‐ Radar sensor deac‐
tivated See Own‐ tivated See Own‐
er's Manual er's Manual The radar sensor system is deactivated.
X Check whether or not the radar sensor system may be activated
(Y page 350).
X Switch on the radar sensor system (Y page 223).Radar sensor deac‐
Radar sensor deac‐
tivated tivated
autom.
autom.See
See
Owner's Manual
Owner's Manual Vehicles with a navigation system: the vehicle is close to a radio
telescope facility and is therefore prohibited from transmitting any
radar signals. The radar sensor system is deactivated automati-
cally.
If Blind Spot Assist was activated, it is no longer available. The
yellow 9indicator lamps also light up in the exterior mirrors.
X Drive on.
Blind Spot Assist is available again as soon as the vehicle is far
enough away from the radio telescope facility (Y page 350).246
Display
messagesOn-board computer and displays

X
Fold down the rear seat armrest.
X To open: press the front of cup holder :
or ;.
Cup holder :or; extends automatically.
X To close: slide cup holder :or; back
until it engages. Sun visors
Overview :
Mirror light
; Bracket
= Retaining clip, e.g. for a car park ticket
? Vanity mirror
A Mirror cover
Vanity mirror in the sun visor Mirror light
:only functions if the sun visor
is clipped into bracket ;and mirror cover A
has been folded up. Glare from the side X
Fold down the sun visor.
X Pull the sun visor out of bracket ;.
X Swing the sun visor to the side.
X Vehicles with mirror lights: slide the sun
visor horizontally as desired. Ashtray
Front ashtray !
The stowage space under the ashtray is
not heat resistant. Before placing lit ciga-
rettes in the ashtray, make sure that the
ashtray is properly engaged. Otherwise, the
stowage space could be damaged. Example: vehicles with a stowage compartment
cover
X To open: push the lower section of
cover :.
The stowage compartment opens.
X To remove the insert: lift insert=up;
and out.
X To refit the insert: press insert=into the
holder until it engages.
i If you remove the ashtray insert, you can
use the resulting compartment for stow-
age. Features
277Stowing and features Z

Cleaning the mirror turn signal
!
Only use cleaning agents or cleaning
cloths that are suitable for plastic lenses.
Unsuitable cleaning agents or cleaning
cloths could scratch or damage the plastic lenses of the mirror turn signals.
X Clean the plastic lenses of the mirror turn
signals in the exterior mirror housing using
a wet sponge and a mild cleaning agent,
e.g. Mercedes-Benz car shampoo or clean-
ing cloths.
Cleaning the sensors !
If you clean the sensors with a high-pres-
sure cleaner, make sure that you keep a
distance of at least 30 cm between the
vehicle and the high-pressure cleaner noz-
zle. Information about the correct distance is available from the equipment manufac-
turer. X
Clean sensors :of the driving systems
with water, car shampoo and a soft cloth.
Cleaning the reversing camera !
Do not clean the camera lens and the area
around the reversing camera with a high-
pressure cleaner. X
Use clear water and a soft cloth to clean
camera lens :.
Cleaning the exhaust tail pipes Impurities combined with the effects of road
grit and corrosive environmental factors may cause flash rust to form on the surface. You
can restore the original shine of the exhaust
pipe by cleaning it regularly, especially in win-
ter and after washing.
! Do not clean the exhaust pipe with acid-
based cleaning agents such as sanitary
cleansers or wheel cleaners.
X Clean the exhaust pipe with a care product
tested and approved by Mercedes-Benz.
! AMG vehicles with black exhaust pipes:
do not use chrome polish to polish black
chromed screens. They will otherwise lose
their silky black shine. Rub the screen using
a lightly oiled cloth after every car wash.
Commercially available engine oils, WD 40
or Ballistol are suitable oils.
Cleaning the trailer tow hitch H
Environmental note
Dispose of oily and greasy cloths in an envi-
ronmentally-responsible manner.
! Do not clean the ball coupling with a high-
pressure cleaner. Do not use solvents.
! Observe the note on care provided by the
trailer manufacturer. 294
CareMaintenance and care

Comply with safety precautions and take pro-
tective measures when handling batteries. WARNING
Fire, naked flames and smoking
are prohibited when handling the
battery. Avoid creating sparks.
Battery acid is caustic. Avoid con-
tact with the skin, eyes or clothing.
Wear suitable protective clothing,
in particular gloves, an apron and a
face mask.
Immediately rinse acid splashes
off with clean water. Consult a doc-
tor if necessary. Wear eye protection.
Keep children away.
Observe this Owner's Manual.
For safety reasons, Mercedes-Benz recom-
mends that you only use batteries which have been tested and approved for your vehicle by
Mercedes-Benz. These batteries provide
increased impact protection to prevent vehi-
cle occupants from suffering acid burns
should the battery be damaged in the event of
an accident.
In order for the battery to achieve the maxi-
mum possible service life, it must always be
sufficiently charged.
Like other batteries, the vehicle battery may
discharge over time if you do not use the
vehicle. In such cases, have the battery dis-
connected at a qualified specialist workshop. You can also charge the battery with a
charger recommended by Mercedes-Benz. For more information, please contact a quali-
fied specialist workshop.
Have the battery charge checked more fre-
quently if you use the vehicle mainly for short
trips or if you leave it standing idle for a
lengthy period. Consult a qualified specialist
workshop if you wish to leave your vehicle
parked up for a long period of time.
i When you park the vehicle, remove the
key if you do not require any electrical con-
sumers. The vehicle will then use very little energy, thus conserving battery power.
i If the power supply has been interrupted,
e.g. if the battery was discharged, you will
have to:
R set the clock (audio system/COMAND
Online, see the separate operating
instructions).
R reset the function for folding the exterior
mirrors in/out automatically, by folding
the mirrors out once (Y page 99). Charging the battery
G
WARNING
During charging and jump-starting, explosive
gases can escape from the battery. There is a risk of an explosion.
Particularly avoid fire, naked flames, creating
sparks and smoking. Ensure there is sufficient
ventilation while charging and jump-starting.
Do not lean over a battery. G
WARNING
Battery acid is caustic. There is a risk of injury. Avoid contact with the skin, eyes or clothing.
Do not inhale any battery gases. Do not lean
over the battery. Keep children away from
batteries. Wash battery acid immediately with water and seek medical attention. G
WARNING
A discharged battery can freeze at tempera-
tures below freezing point. When jump-start- 306
Battery (vehicle)Breakdown assistance