2012 MERCEDES-BENZ A CLASS buttons

Speedometer
Activating/deactivating the addi-
tional speedometer ........................220
Digital ............................................ 212
In the Instrument cluster
.................30
Segments ...................................... 209
Selecting the unit of measurement 220
see Instrument cluster
SPEEDTRONIC
Deactivating variable .....................172
Display message ............................ 250
Function/notes ............................. 171
Important safety notes .................. 171
LIM indicator lamp .........................171
Permanent ..................................... 172
Selecting ........................................ 171
Storing the current speed .............. 172
Variable ......................................... 171
SPORT handling mode
Activating/deactivating (AMG
vehicles) .......................................... 66
Warning lamp ................................. 261
SRS (Supplemental Restraint Sys-
tem)
Display message ............................ 238
Introduction ..................................... 41
Warning lamp ................................. 263
Warning lamp (function) ................... 41
Start/stop function
see ECO start/stop function
Starting (engine) ................................ 143
STEER CONTROL .................................. 69
Steering (display message) ..............255
Steering wheel Adjusting (manually) ........................98
Button overview ............................... 33
Buttons (on-board computer) ......... 209
Cleaning ......................................... 295
Gearshift paddles ........................... 156
Important safety notes .................... 98
Steering wheel gearshift paddles ....156
Stopwatch (RACETIMER) ................... 226
Stowage areas ................................... 269
Stowage compartment Spectacles compartment ...............269
Stowage compartments
Armrest (front) ............................... 270
Armrest (under) ............................. 270Centre console ..............................
269
Centre console (rear) ..................... 271
Cup holder
..................................... 275
Glove compartment ....................... 269
Important safety information ......... 269
Luggage net ................................... 271
Under driver's seat/front-
passenger seat .............................. 270
Summer tyres .................................... 320
Sun visor ............................................ 277
Supplemental Restraint System see SRS (Supplemental Restraint
System)
Surround lighting (on-board com-
puter) .................................................. 222
Switching off the alarm (ATA) ............69 T
Tailgate Display message

............................ 254
Emergency unlocking .......................83
Important safety notes .................... 82
Opening/closing (from outside) ....... 82
Opening dimensions ...................... 346
Tail lamps
Display message ............................ 241
see Lights
Technical data
Capacities ...................................... 338
Emergency spare wheel ................. 333
Information .................................... 336
Trailer loads ................................... 349
Tyres/wheels ................................. 329
Vehicle data ................................... 346
Telephone
Accepting a call ............................. 216
Display message ............................ 256
Menu (on-board computer) ............ 215
Number from the phone book ........ 216
Redialling ....................................... 217
Rejecting/ending a call ................. 216
Telephone compartment ................ 270
Temperature
Coolant .......................................... 208
Coolant (on-board computer) ......... 226
Engine oil (on-board computer) ...... 226 Index
17

Key functions
:
& To lock the vehicle
; % To unlock the vehicle
X To unlock centrally: press button ;.
If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
R the vehicle is locked again.
R the anti-theft system is primed again.
X To lock centrally: press button :.
The key centrally locks/unlocks:
R the doors
R the tailgate
R the fuel filler flap
When unlocking, the turn signals flash once.
When locking, they flash three times.
i When

it is dark, the surround lighting also
comes on if it is activated in the on-board
computer (Y page 222).
i You can also set an audible signal to con-
firm that the vehicle has been locked. The
audible signal can be activated and deacti-
vated using the on-board computer
(Y page 223). Changing the settings of the locking
system
You can change the settings of the locking
system.

This means that only the driver's door
and the fuel filler flap are unlocked when the
vehicle is unlocked. This is useful if you fre-
quently travel on your own.
X To change the setting: press and hold
down the % and & buttons simulta-
neously

for approximately six seconds until
battery check lamp (Y page 76) flashes
twice.
i If the setting of the locking system is
changed
within the signal range of the vehi-
cle, pressing the & or % button:
R locks or
R unlocks the vehicle
The key now functions as follows:
X To unlock the driver's door: press the
% button once.
X To unlock centrally: press the % but-
ton twice.
X To lock centrally: press the & button.
X To restore the factory settings: press
and
hold down the % and & buttons
simultaneously for approximately six sec-
onds until the battery check lamp flashes
twice (Y page 76). Emergency key element
General notes If the vehicle can no longer be unlocked with
the key, use the emergency key element.
If you use the emergency key element to
unlock and open the driver's door, the anti-
theft alarm system will be triggered
(Y page 69).
There are several ways to turn off the alarm:
X
Press the % or &
button on the key.
or
X Insert the key into the ignition lock. Key
75
Opening and closing Z

X
Take the emergency key element out of the
key ( Y page 75). X
Press emergency key element ; into the
opening in the key in the direction of the
arrow until battery tray cover : opens.
When
doing so, do not hold cover : shut.
X Remove battery tray cover :.X
Repeatedly tap the key against your palm
until battery = falls out.
X Insert the new battery with the positive ter-
minal facing upwards. Use a lint-free cloth
to do so.
X Make sure that the surface of the battery is
free

from lint, grease and all other forms of
contamination.
X Insert the front tabs of battery tray
cover : and then press to close it.
X Insert the emergency key element into the
key.
X Check the function of all key buttons on the
vehicle. Key
77
Opening and closing Z

You can only open the rear doors from inside
the vehicle if they are not secured by the
child-proof locks (Y page 60).
If
the vehicle has been locked using the lock-
ing button for the central locking, or has been
locked automatically, and a door is opened
from the inside:
R the vehicle will be fully unlocked if it had
previously been fully unlocked
R only the door which has been opened form
the inside is unlocked if only the driver's
door had been previously unlocked Automatic locking feature
X
To deactivate: press and hold button :
for
about five seconds until a tone sounds.
X To activate: press and hold button ; for
about five seconds until a tone sounds.
i If you press one of the two buttons and
do

not hear a tone, the relevant setting has
already been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are
turning.
You could therefore be locked out if:
R the vehicle is being pushed.
R the vehicle is being towed.
R the vehicle is being tested on a dynamom-
eter.
You can also switch the automatic locking
function on and off using the on-board com-
puter ( Y page 223). Unlocking the driver's door (emer-
gency key element)
If

the vehicle can no longer be unlocked with
the key, use the emergency key element.
If you use the emergency key element to
unlock and open the driver's door, the anti-
theft alarm system will be triggered
(Y page 69).
X Take the emergency key element out of the
key ( Y page 75).
X Insert the emergency key element into the
lock

of the driver's door as far as it will go. X
Turn the emergency key element anti-
clockwise to position 1.
The door is unlocked.
i On right-hand-drive vehicles, turn the
emergency key element clockwise.
X Turn the emergency key element back and
remove it.
X Insert the emergency key element into the
key. Locking the vehicle (emergency key
element)
If

the vehicle can no longer be locked with the
key, use the emergency key element.
X Open the driver's door.
X Close the front-passenger door, the rear
doors and the tailgate.
X Press the locking button (Y page 80).
X Check whether the locking knobs on the
front-passenger door and the rear doors Doors
81
Opening and closing Z

Seats
Important safety notes
G
WARNING
If children adjust the seats, they could
become trapped, especially if they are unat-
tended. There is a risk of injury.
When
leaving the vehicle, always take the key
with you and lock the vehicle. Never leave
children unattended in the vehicle. G
WARNING
You could lose control of the vehicle while
driving if you:
R adjust the driver's seat, steering wheel or
mirrors
R fasten the seat belt
There is a risk of an accident.
Adjust

the driver's seat, head restraint, steer-
ing wheel and mirrors and fasten your seat
belt before starting the engine. G
WARNING
If you adjust the seat height carelessly, you or
other
vehicle occupants could be trapped and
thereby injured. Children in particular could
accidentally press the electrical seat adjust-
ment buttons and become trapped. There is
a risk of injury.
While moving the seats, make sure that your
hands or other body parts do not get under
the lever assembly of the seat adjustment
system. G
WARNING
When adjusting a seat, you or another vehicle
occupant
could become trapped by the guide
rail of the seat, for instance. There is a risk of
injury.
Make sure that no one has any part of their
body within the sweep of the seat when
adjusting it. G
WARNING
The seat belt does not offer the intended level
of protection if the backrest is not in the
upright

position. When braking or in the event
of an accident, you could slide underneath the
seat belt and sustain abdomen or neck inju-
ries, for example. This poses an increased risk
of injury or even fatal injury.
Adjust the seat properly before beginning
your journey. Always make sure that the seat
is in the upright position. G
WARNING
The head restraints cannot provide the inten-
ded protection unless they are fitted and
adjusted

correctly. There is an increased risk
of injury to the head and neck in the event of
an accident or sudden braking, for example.
Always drive with the head restraints fitted.
Ensure that the centre of the head restraints
support the back of each vehicle occupant's
head at eye level before driving off.
! To avoid damage to the seats and the seat
heating, observe the following information:
R do not spill any liquids on the seats. If
liquid is spilled on the seats, dry them as
soon as possible.
R if the seat covers are damp or wet, do not
switch on the seat heating. The seat
heating should also not be used to dry
the seats.
R clean the seat covers as recommended;
see the "Interior care" section.
R do not transport heavy loads on the
seats. Do not place sharp objects on the
seat cushions, e.g. knives, nails or tools.
The seats should only be occupied by
passengers, if possible.
R when the seat heating is in operation, do
not cover the seats with insulating mate-
rials, e.g. blankets, coats, bags, seat cov-
ers, child seats or booster seats.
! Make sure that there are no objects in the
footwell or behind the seats when moving Seats
93
Seats, steering wheel and mirrors Z

Control panel for THERMOTRONIC automatic climate control (2-zone)
:
To set the temperature, left (Y page 128)
; To set climate control to automatic mode (Y page 128)
= To demist the windscreen (Y page 130)
? To increase the airflow ( Y page 129)
A To set the air distribution ( Y page 129)
B Display
C To activate/deactivate air-recirculation mode ( Y page 132)
D To switch climate control on/off (Y page 126)
E To set the temperature, right (Y page 128)
F To activate/deactivate the residual heat function ( Y page 133)
G To activate/deactivate cooling with air dehumidification (Y page 126)
H To reduce the airflow ( Y page 129)
I To switch the rear window heating on/off ( Y page 131)
J To switch the ZONE function on/off (Y page 129) Notes on using THERMOTRONIC auto-
matic climate control
Automatic climate control The following contains instructions and rec-
ommendations
to enable you to get the most
out of your THERMOTRONIC automatic cli-
mate control. R
Activate
climate control using the à and
¿ buttons. The indicator lamps in the
à and ¿ buttons light up.
R Set the temperature to 22 †.
R Only use the "windscreen demisting" func-
tion briefly until the windscreen is clear
again.
R Only use air-recirculation mode briefly, e.g.
if there are unpleasant outside odours or
when in a tunnel. The windows could oth- Overview of climate control systems
125
Climate control

Setting the air distribution
THERMATIC automatic climate control Air distribution settings
¯
Directs the airflow through the demis-
ter vents
P Directs the airflow through the centre
and side air vents
O Directs the airflow through the foot-
well air vents
i You can also activate several of the air
distribution settings simultaneously. In
order to do this, press several of the air
distribution buttons. The air is then routed
through different air vents.
Setting the air distribution
X Turn the key to position 2 in the ignition
lock (Y page 143).
X Press one or more of the P, O,
¯ buttons.
The corresponding indicator lamp comes
on.
THERMOTRONIC automatic climate
control Air distribution settings
¯
Directs the airflow through the demis-
ter vents
P Directs the airflow through the centre
and side air vents
O Directs the airflow through the foot-
well air vents
S Directs airflow through the centre and
side
air vents as well as the footwell air
vents 10
.
b Directs the airflow through the centre
and

side air vents as well as the demis-
ter vents 10
a Directs the airflow through the foot-
well and demister vents i
Regardless of the air distribution setting,
airflow is always directed through the side
air vents. The side air vents can only be
closed

if the adjusters are turned clockwise
until they engage.
Setting the air distribution
X Turn the key to position 2 in the ignition
lock (Y page 143).
X Press the É or Ë button until the
desired symbol appears in the display. Setting the airflow
THERMATIC automatic climate control X
Turn the key to position 2 in the ignition
lock (Y page 143).
X To increase/reduce: turn control A
clockwise or anti-clockwise (Y page 123).
THERMOTRONIC automatic climate
control X
Turn the key to position 2 in the ignition
lock (Y page 143).
X To increase/reduce: press the K or
I button. Switching the ZONE function on/off
This function is only available with the
THERMOTRONIC automatic climate control.
X To activate: press the á button.
The
indicator lamp in the á button lights
up.
The temperature setting for the driver's
side is not adopted for the front-passenger
side.
X To deactivate: press the á button.
The
indicator lamp in the á button goes
out.
10 Only for certain countries. Operating the climate control system
129
Climate control

The following messages may appear in the
display:
Display Meaning
The auxiliary heating/
ventilation is switched
off.
The auxiliary ventilation
is
switched on. The num-
ber in the display shows
the remaining time (in
minutes) for the auxiliary
ventilation. The auxiliary heating is
switched

on. The number
in the display shows the
remaining time (in
minutes) for the auxiliary
heating. A departure time has
been activated. The
departure time appears
in the display.
A departure time has
been activated. The aux-
iliary ventilation is cur-
rently activated. The
departure time appears
in the display.
A departure time has
been activated. The aux-
iliary heating is currently
activated. The departure
time appears in the dis-
play. Setting the departure time
X
Press the , or . button repeatedly
until
the time to be changed appears in the
display.
X Press the u and ^ buttons simulta-
neously.
The Î symbol in the remote control dis-
play flashes.
X Press the , or . button to set the
desired departure time.
i The longer you press the , or .
button, the faster the time changes.
X Press the u and ^ buttons simulta-
neously.
The new departure time is stored.
Activating the set departure time
X Press the , or . button repeatedly
until
the desired departure time appears in
the display.
X Press the u button.
The Í symbol and the departure time
appear in the display.
Deactivating a set departure time
X Press the , or . button.
The
status of the auxiliary heating is shown
in the display.
X Press the . button.
The first departure time stored appears in
the display.
X Press the ^ button.
OFF

is shown in the remote control display.
Replacing the remote control battery G
WARNING
Batteries contain toxic and corrosive substan-
ces.
If batteries are swallowed, it can result in
severe health problems. There is a risk of fatal
injury.
Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention
immediately. 136
Operating the climate control system
Climate control