ignition MERCEDES-BENZ A CLASS 2012 Repair Manual

Deactivating/activating PARKTRONIC
:
Indicator lamp
; To deactivate/activate PARKTRONIC
If indicator lamp : lights up, PARKTRONIC is
deactivated.
i PARKTRONIC is automatically activated
when you turn the key to position 2 in the
ignition lock.
Towing a trailer !
Fold in the ball coupling if the trailer tow
hitch is not required. PARKTRONIC meas-
ures the minimum detection range to an
obstacle

from the bumper, not the ball cou-
pling.
PARKTRONIC is deactivated for the rear area
when you establish an electrical connection
between your vehicle and a trailer. Driving systems
185
Driving and parking Z

Problems with PARKTRONIC
Problem Possible causes/consequences and
M SolutionsOnly the red segments
in the PARKTRONIC
warning
displays are lit.
You also hear a warning
tone for approximately
two seconds.
PARKTRONIC is deacti-
vated after approx-
imately five seconds,
and the indicator lamp
in the PARKTRONIC
button lights up. PARKTRONIC has malfunctioned and has switched off.
X
If problems persist, have PARKTRONIC checked at a qualified
specialist workshop. Only the red segments
in the PARKTRONIC
warning

displays are lit.
PARKTRONIC is deacti-
vated after approx-
imately five seconds. The PARKTRONIC sensors are dirty or there is interference.
X
Clean the PARKTRONIC sensors ( Y page 294).
X Switch the ignition back on. The problem may be caused by an external source of radio or
ultrasound waves.
X
See if PARKTRONIC functions in a different location. Active Parking Assist
Important safety notes Active Parking Assist is only an aid. It is not a
substitute

for your attention to the immediate
surroundings. The responsibility for safe
manoeuvring and parking remains with you.
Make sure that there are no persons, animals
or objects in range while manoeuvring and
parking. G
WARNING
The vehicle will veer out when parking and can
take
you onto sections of the oncoming lane.
As a result, you may collide with other road
users. There is a risk of an accident.
When parking, pay attention to other road
users. Stop the vehicle if necessary or cancel
the Active Parking Assist parking procedure.
! If unavoidable, you should drive over
obstacles such as kerbs slowly and not at a sharp angle. Otherwise, you may damage
the wheels or tyres.
Active

Parking Assist may also display spaces
not suitable for parking, e.g.:
R parking or stopping prohibitions
R in front of driveways or entrances and exits
R unsuitable surfaces
Parking tips:
R on narrow roads, drive as closely as possi-
ble past the parking space.
R parking spaces that are littered, overgrown
or partially occupied by trailer drawbars
might be identified incorrectly or not at all.
R snowfall or heavy rain may lead to a parking
space being measured inaccurately.
R pay attention to the PARKTRONIC
(Y page 184) warning messages during the
parking procedure. 186
Driving systems
Driving and parking

Reversing camera
Important safety notes The reversing camera is only an aid. It is not
a substitute for your attention to the imme-
diate
surroundings. The responsibility for safe
manoeuvring and parking remains with you.
Make sure that there are no persons, animals
or objects in range while manoeuvring and
parking.
Under the following circumstances, the
reversing camera will not function, or will
function in a limited manner:
R if the tailgate is open
R in heavy rain, snow or fog
R at night or in very dark places
R if the camera is exposed to very bright light
R if the area is lit by fluorescent light or LED
lighting (the display may flicker)
R if there is a sudden change in temperature,
e.g. when driving into a heated garage in
winter
R if the camera lens is dirty or obstructed
R if the rear of your vehicle is damaged. In
this event, have the camera position and
setting checked at a qualified specialist
workshop.
General notes Reversing camera
:
is in the boot lid handle.
The reversing camera extends, when it is acti-
vated.
The reversing camera is an optical parking
and manoeuvring aid. It uses guide lines to show the area behind your vehicle in the
Audio/COMAND display.
The area behind the vehicle is displayed as a
mirror image, as in the rear-view mirror.
i
The text of messages shown in the
COMAND

display depends on the language
setting. The following are examples of
reversing camera messages in the
COMAND display.
Activating/deactivating the reversing
camera X
To activate: make sure that the key is in
position 2 in the ignition lock.
X Make sure that the "Activation by R gear"
setting is active in the audio system/
COMAND Online; see the separate audio
system/COMAND Online operating
instructions.
X Engage reverse gear.
Guide lines are used to show the area
behind the vehicle in the Audio/COMAND
display. Function mode display for vehicles with COMAND
Online and a trailer tow hitch
X
To change the function mode in vehi-
cles with COMAND Online and trailer
tow hitch: using the COMAND controller,
select

symbol : for the "Reverse parking" Driving systems
191
Driving and parking Z

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 reverse
gear 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 2 in 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
Spot Assist currently unavailable
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 2 in 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
199
Driving and parking Z

X
Press the ball coupling in the direction of
the arrow until it engages behind the
bumper.
Indicator lamp ? goes out and the mes-
sage in the multifunction display disap-
pears. Trailer power supply
! You can connect accessories with a
power rating of up to 240 W to the perma-
nent
power supply and with a power rating
of up to 180 W to the power supply that is
switched on via the ignition lock.
The trailer battery may not be charged from
the power supply.
X To switch the connected power supply
on or off: turn the key in the ignition lock
to position 2 or 0 respectively.
When it leaves the factory, your vehicle's
trailer socket is equipped with a permanent
power supply and a power supply that is
switched on via the ignition lock.
The permanent power supply is supplied via
trailer socket pin 9.
The power supply that is switched on via the
ignition lock is supplied via trailer socket pin
10.
The trailer's permanent power supply is
switched

off in the event of low vehicle supply
voltage and after six hours at the latest.
You can find more information about instal-
ling the trailer electrics at a qualified special-
ist workshop. Bulb failure indicator for LED lamps
i If LED lamps are fitted in the trailer, an
error message may appear in the multi-
function

display even if there is no fault. The
reason for the error message could be that
the current has fallen below the minimum
of 50 mA. To ensure reliable operation of the bulb failure
indicator,

each LED chain in the trailer lighting
must be guaranteed a minimum current of
50 mA. Trailer with 7-pin connector
General notes Trailer with 7-pin connector: you can con-
nect

to the 13-pin socket on the ball coupling
using an adapter or, if necessary, an adapter
cable. Both can be obtained at a qualified
specialist workshop.
Fitting the adapter !
Make sure that there is sufficient cable
play so that the cable cannot become
detached when cornering.
! Remove the installed adapter cable
before folding in the ball coupling. Other-
wise, damage may occur to the rear
bumper and the adapter cable. X
Open the socket cover.
X Insert the plug connector with lug : into
groove =

on the socket. Turn bayonet con-
nection ; clockwise to the stop.
X Let the cover engage.
X If you are using an adapter cable, secure
the cable to the trailer with cable ties.206
Towing a trailer
Driving and parking

The fuel supply is interrupted to protect the
engine when the red band is reached.
Outside temperature display
You should pay special attention to road con-
ditions when temperatures are around the
freezing point.
The outside temperature display is in the mul-
tifunction display.
Changes in the outside temperature are dis-
played after a short delay. Speedometer with segments
The segments in the speedometer indicate
which speed range is available.
R Cruise control activated ( Y page 168):
The segments light up from the stored
speed to the maximum speed.
R Variable SPEEDTRONIC activated
(Y page 171):
The

segments light up from the start of the
scale to the selected limit speed.
R DISTRONIC PLUS activated (Y page 173):
One or two segments in the set speed
range light up.
R DISTRONIC PLUS detects a vehicle in front:
The segments between the speed of the
vehicle in front and the stored speed light
up. Operating the on-board computer
Overview :
Multifunction display
; Switches on LINGUATRONIC; see the sep-
arate operating instructions
= Right control panel
? Left control panel
A Back button
X To activate the on-board computer:
turn
the key to position 1 in the ignition lock.
You can control the multifunction display and
the settings in the on-board computer using
the buttons on the multifunction steering
wheel. Displays and operation
209
On-board computer and displays Z

X
Press the = or ; button on the steer-
ing wheel to select the Trip menu.
X Press the 9 or : button to select
From start or From reset.
The values in the From start submenu are
calculated from the start of a journey, whilst
the values in the From reset submenu are
calculated from the last time the submenu
was reset ( Y page 213).
The From start trip computer is automati-
cally reset when:
R the

ignition has been switched off for more
than four hours.
R 999 hours have been exceeded.
R 9,999 kilometres have been exceeded.
The From reset trip computer is automati-
cally reset if the value exceeds 9,999 hours
or 99,999 kilometres.
ECO display Example: ECO display
X
Press the =
or ; button on the steer-
ing wheel to select the Trip menu.
X Press the 9 or : button to select
ECO DISPLAY.
If the ignition remains switched off for longer
than
four hours, the ECO display will be auto-
matically reset.
For further information on the ECO display,
see ( Y page 165). Displaying the range and current fuel
consumption X
Press the =
or ; button on the steer-
ing wheel to select the Trip menu.
X Press the 9 or : button to select
current fuel consumption ; (not for AMG
vehicles) and approximate range :.
The approximate range that can be covered
is
calculated according to your current driving
style and the amount of fuel in the tank. If
there is only a small amount of fuel left in the
fuel tank, the display shows a vehicle being
refuelled C instead of the range.
Digital speedometer :
Gearshift recommendation, manual trans-
mission

(Y page 151) or automatic trans-
mission ( Y page 156)
; Digital speedometer
Gearshift recommendation :
is not given on
AMG vehicles.
X Press the =
or ; button on the steer-
ing wheel to select the Trip menu.
X Press the 9
or : button to select the
digital speedometer. 212
Menus and submenus
On-board computer and displays

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 menu.
X Press the :
or 9 button to select the
Lights submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Adapt. main beam function.
If the 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 a button to save the setting.
For further information about Adaptive High-
beam Assist, see ( Y page 110).
Setting the brightness of the ambient
lighting
X Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Lights submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Amb. light +/- function.
You will see the selected setting.
X Press a to confirm.
X Press the :
or 9 button to adjust the
brightness to any level from Off toLevel
5 (bright).
X Press the a or %
button to save the
setting.
Activating/deactivating the surround
lighting and exterior lighting delayed
switch-off
If you have activated the Surround light‐
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 menu.
X Press the :
or 9 button to select the
Lights submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Surround lighting function.
When the 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 a button to save the setting.
Deactivating delayed switch-off of the exte-
rior lighting temporarily:
X Before leaving the vehicle, turn the key to
position 0 in the ignition lock.
X Turn the key to position 2 in 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 foglamps222
Menus and submenus
On-board computer and displays

R
dipped-beam headlamps
R daytime driving lights
R surround lighting in the exterior mirrors
Activating/deactivating
the interior light-
ing delayed switch-off
If you activate the Lighting delayed sw.-
off function, the interior lighting remains on
for 20 seconds after you remove the key from
the ignition lock.
X Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Lights submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Lighting delayed sw.-off function.
If the Lighting delayed sw.-off func-
tion has been switched on, the vehicle inte-
rior is displayed in orange in the multifunc-
tion display.
X Press the a button to save the setting.
Vehicle Setting permanent SPEEDTRONIC
X
Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Vehicle submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Limit speed (winter tyres): function.
You will see the current setting.
X Press a to confirm.
X Press the : or 9 button to adjust
permanent
SPEEDTRONIC in increments of
ten (230 km/h to 160 km/h). The Off set-
ting switches permanent SPEEDTRONIC
off.
X Press the a button to store the entry.
Using the Limit speed (winter tyres)
function, you can set permanent SPEED-
TRONIC ( Y page 172). Switching the automatic locking feature
on/off
X
Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Vehicle submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Automatic door locks function.
When the Automatic door locks func-
tion is activated, the vehicle doors are dis-
played in orange in the multifunction dis-
play.
X Press the a button to save the setting.
If you activate the Automatic door locks
function,
the vehicle is centrally locked above
a speed of around 15 km/h.
For further information on the automatic lock-
ing feature, see ( Y page 81).
Activating/deactivating the acoustic
locking confirmation
If you switch on the Acoustic Lock function,
an acoustic signal sounds when you lock the
vehicle.
X Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Vehicle submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Acoustic Lock function.
If the Acoustic Lock function is activated,
the & symbol in the multifunction dis-
play lights up orange.
X Press the a button to save the setting.
Activating/deactivating the radar sensor
system
X Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Vehicle submenu.
X Press a to confirm. Menus and submenus
223
On-board computer and displays Z

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 menu.
X Press the :
or 9 button to select the
Convenience submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Belt adjustment function.
If the Belt adjustment function is activa-
ted, the vehicle seat belt is shown in orange
in the multifunction display.
X Press the a button 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. fold-in mir‐
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. fold-in
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 menu.
X Press the :
or 9 button to select the
Convenience submenu.
X Press a to confirm.
X Press the :
or 9 button to select the
Auto. fold-in mirrors function.
If the Auto. fold-in mirrors function is
activated, the vehicle's exterior mirror is
displayed in orange in the multifunction
display.
X Press the a button to save the setting.
Resetting to factory settings X
Press the =
or ; button on the steer-
ing wheel to select the Settings menu.
X Press the :
or 9 button to select the
Factory setting submenu.
X Press a to confirm.
The Reset all settings? message
appears.
X Press the : or 9 button to select
No or Yes.
X Press the a
button to confirm the selec-
tion.
If you have selected Yes , the multifunction
display shows a confirmation message.
For safety reasons, not all functions are reset:
the Limit speed (winter tyres): func-
tion

in permanent SPEEDTRONIC can only be
set in the VEHICLE submenu. If you want to
reset the Daytime driving lights: in the
Light submenu, you must turn the key in the
ignition lock to position 1. Menus and submenus
225
On-board computer and displays Z