2012 MERCEDES-BENZ A CLASS alarm

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

alarm system is triggered if the door is
opened from the inside. Switch off the alarm
(Y page 69).
Unlocking and opening the doors
from the inside
X
Pull door handle ;.
If the door is locked, locking knob : pops
up. The door is unlocked and can be
opened.
For all countries except the United King-
dom:
You can open a door from inside the vehicle
even if it has been locked.
If

the vehicle has previously been locked with
the key, opening a door from the inside will
trigger the anti-theft alarm system. Switch off
the alarm ( Y page 69).
You can only open the rear doors from inside
the vehicle if they are not secured by the
child-proof locks (Y page 60).
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then
not possible to open the doors from inside the
vehicle. Deactivate the interior motion sensor
(Y page 70) before you lock the vehicle with
the key. The doors can then be opened from
the inside after the vehicle has been locked
from the outside. The anti-theft alarm system
is triggered if the door is opened from the
inside. Switch off the alarm (Y page 69). Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle
from

the inside. This can be useful if you wish
to lock the vehicle before pulling away, for
example. X
To unlock: press button :.
X To lock: press button ;.
If all the doors and the tailgate are closed,
the vehicle locks.
This does not lock or unlock the fuel filler flap.
You cannot unlock the vehicle centrally from
the

inside if the vehicle has been locked with
the key.
For all countries except the United King-
dom: you can open a door from inside the
vehicle even if it has been locked.
If the vehicle has previously been locked with
the key, opening a door from the inside will
trigger the anti-theft alarm system. Switch off
the alarm ( Y page 69).
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then
not possible to open the doors from inside the
vehicle. Deactivate the interior motion sensor
(Y page 70) before you lock the vehicle with
the key. The doors can then be opened from
the inside after the vehicle has been locked
from the outside. The anti-theft alarm system
is triggered if the door is opened from the
inside. Switch off the alarm (Y page 69). 80
Doors
Opening and closing

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

are still visible. Press down the locking
knobs manually, if necessary
(Y page 80).
X Close the driver's door.
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 clockwise
as far as it will go to position 1.
i On right-hand-drive vehicles, turn the
emergency key element anti-clockwise.
X Turn the emergency key element back and
remove it.
X Make sure that the doors and the tailgate
are locked.
X Insert the emergency key element into the
key.
i If
you lock the vehicle as described above,
the fuel filler flap is not locked. The anti-
theft alarm system is not primed. Luggage compartment
Important safety notes
G
WARNING
Combustion engines emit poisonous exhaust
gases
such as carbon monoxide. If the tailgate
is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning. Turn off the engine before opening the tail-
gate. Never drive with the tailgate open.
G
WARNING
If persons (particularly children) are exposed
to heat or cold for a prolonged period, there
is

a risk of serious or even fatal injuries. Never
leave persons (particularly children) unatten-
ded in the vehicle.
! The tailgate swings upwards and to the
rear when opened. Therefore, make sure
that there is sufficient clearance above and
behind the tailgate.
i The opening dimensions of the tailgate
can be found in the "Vehicle data" section
(Y page 346).
You should preferably place luggage or loads
in the luggage compartment. Observe the
loading guidelines ( Y page 268).
Do not leave the key in the luggage compart-
ment. You could otherwise lock yourself out.
The tailgate can be:
R opened and closed manually from outside
R unlocked from the inside with the emer-
gency key element Opening/closing from the outside
Opening X
Press the % button on the key. X
Pull handle :.
X Raise the tailgate.82
Luggage compartment
Opening and closing