Page 100 of 239

98Instruments and controlsWhen the vehicle battery voltage is
running low, a warning code 174 will
appear in the Driver Information
Centre.
Uplevel-Display
When the vehicle battery voltage is running low, a warning message will
appear in the Driver Information
Centre.
1. Switch off immediately any electrical consumers which are
not required for a safe drive, e.g.
seat heating, heated rear window
or other main consumers.
2. Charge the vehicle battery by driving continuously for a while or
by using a charging device.
The warning message or warning
code will disappear after the engine
has been started twice consecutively
without a voltage drop.
If the vehicle battery cannot be
recharged, have the cause of the fault
remedied by a workshop.Vehicle personalisation
The vehicle's behaviour can be
personalised via changing the
settings in the Info-Display.
Some of the personal settings for
different drivers can be memorised
individually for each vehicle key.
Memorised settings 3 21.
Depending on vehicle equipment and country-specific regulations some ofthe functions described below might
not be available.
Some functions are only displayed or
active when the engine is running.
Personal settings
Graphic-Info-Display
Press CONFIG for the Settings menu.
Turn the MENU-TUNE knob to move
to the desired setup menu, then press
MENU-TUNE .
Select Settings and then Vehicle
settings .
Vehicle settings
● Climate and air quality
Auto fan speed : Modifies the
level of the cabin airflow of the
climate control in automatic
mode.
Page 112 of 239

110LightingNotice
In the event of an accident with
airbag deployment the courtesy
lights are turned on automatically.
Dome light
Spotlight incorporated in the interior
lighting comes on when headlights
are switched on.
Dome light illuminates gear shifting
console indirectly.
Ambient light
Ambient light consists of indirect
lights in the doors, in the instrument
panel below the heating and
ventilation unit and in the passenger
foot well. 8 colours can be selected by a button in the roof console.
Operate button with ignition switched
on:
m one brief
press:on or offS repeated
brief presses:colours change in
stepsS long press:colours change
continuously
Ambient light can be dimmed with the thumb wheel A together with the
instrument panel illumination 3 109.
The selected colour remains the next
time the ignition is switched on.
Ambient light comes on automatically when switching off ignition and
extinguishes after opening a door.
Pressing m after switching off ignition;
ambient light remains on for
60 minutes.
Starlight panel Starlight panel consists of approx.
64 LEDs. The intensity can be
dimmed with a button in the roof
console.
Page 115 of 239

Climate control113Climate controlClimate control systems.............113
Heating and ventilation system 113
Air conditioning system ...........114
Electronic climate control system .................................... 116
Air vents ..................................... 121
Adjustable air vents .................121
Fixed air vents ......................... 121
Maintenance .............................. 121
Air intake ................................. 121
Pollen filter ............................... 121
Air conditioning regular operation ................................ 122
Service .................................... 122Climate control systems
Heating and ventilation system
Controls for: ● temperature
● fan speed
● air distribution
Heated rear window Ü 3 30.
Heated seats ß 3 36.
Heated steering wheel * 3 70.
Temperaturered:warmblue:cold
Heating will not be fully effective until
the engine has reached normal
operating temperature.
Fan speed
Adjust the air flow by switching the fan
to the desired speed.
Air distribution
M:to head areaL:to head area and foot wellK:to foot well and windscreenJ:to windscreen, front door
windows and foot welll:to windscreen and front door
windows
Intermediate settings are possible.
Page 116 of 239

114Climate controlDemisting and defrosting the
windows
● Set temperature control to warmest level.
● Set fan speed to highest speed.
● Set air distribution control to l.
● Switch on heated rear window Ü.
● Open side air vents as required and direct them towards door
windows.
● For simultaneous warming of the
foot well, set air distribution
control to J.
Air conditioning system
Controls for:
● temperature
● fan speed
● air distribution
n:cooling4:air recirculationÜ:heated rear window 3 30
Heated seats ß 3 36.
Heated steering wheel * 3 70.
Temperature
red:warmblue:coldHeating will not be fully effective until
the engine has reached normal
operating temperature.
Fan speed
Adjust the air flow by switching the fan
to the desired speed.
Air distributionM:to head areaL:to head area and foot wellK:to foot well and windscreenJ:to windscreen, front door
windows and foot welll:to windscreen and front door
windows (air conditioning is
activated in the background to
help preventing windows from
fogging)
Intermediate settings are possible.
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118Climate control
If the minimum temperature Lo is set,
the climate control system runs at
maximum cooling, if cooling n is
switched on.
If the maximum temperature Hi is set,
the climate control system runs at
maximum heating.
Notice
If n is switched on, reducing the set
cabin temperature can cause the
engine to restart from an Autostop or inhibit an Autostop.
Stop-start system 3 126.
Demisting and defrosting the
windows V
●
Press V. The LED in the button
illuminates to indicate activation.
● Temperature and air distribution are set automatically and the fan
runs at high speed.
● Switch on heated rear window Ü.
● To return to previous mode: press V, to return to automatic
mode: press AUTO.
Setting of automatic rear window
heating can be changed in the
Info-Display. Vehicle personalisation
3 98.
Notice
If V is pressed while the engine is
running, an Autostop will be inhibited
until V is pressed again.
If s is pressed with the fan switched
on and the engine running, an
Autostop will be inhibited until s is
pressed again or until the fan is
switched off.
If V is pressed while the engine is
in an Autostop, the engine will restart automatically.
If s is pressed with the fan switched
on while the engine is in an
Autostop, the engine will restart
automatically.
Stop-start system 3 126.
Manual settings Climate control system settings can
be changed by activating the buttons
and rotary knobs as follows.
Changing a setting will deactivate the automatic mode.
Page 124 of 239
122Climate controlAir conditioning regularoperation
In order to ensure continuously
efficient performance, cooling must
be operated for a few minutes once a
month, irrespective of the weather
and time of year. Operation with
cooling is not possible when the
outside temperature is too low.
Service For optimal cooling performance, it is recommended to annually check the
climate control system, starting
three years after initial vehicle
registration, including:
● functionality and pressure test
● heating functionality
● leakage check
● check of drive belts
● cleaning of condenser and evaporator drainage
● performance check
Page 129 of 239

Driving and operating127During an Autostop, the heating and
brake performance will be
maintained.
Conditions for an Autostop
The stop-start system checks if each
of the following conditions is fulfilled:
● The stop-start system is not manually deactivated.
● The bonnet is fully closed.
● The driver's door is closed or the driver's seat belt is fastened.
● The vehicle battery is sufficiently charged and in good condition.
● The engine is warmed up.
● The engine coolant temperature is not too high.
● The engine exhaust temperature is not too high, e.g. after driving
with high engine load.
● The ambient temperature is above -5 °C.
● The climate control system allows an Autostop.● The brake vacuum is sufficient.
● The vehicle was driven at least at
walking speed since the last
Autostop.
Otherwise an Autostop will be
inhibited.
Certain settings of the climate control
system may inhibit an Autostop. See
'Climate control' chapter for more
details 3 116.
Immediately after motorway driving,
an Autostop may be inhibited.
New vehicle running-in 3 124.
Vehicle battery discharge protection
To ensure reliable engine restarts, several vehicle battery discharge
protection features are implemented
as part of the stop-start system.
Power saving measures
During an Autostop, several electrical
features, e.g. the rear window
heating, are disabled or switched into
a power saving mode. The fan speed of the climate control system is
reduced to save power.Restart of the engine by the driverVehicles with manual transmission:
Depress the clutch pedal to restart the
engine.
The engine start is indicated by the
needle at the idle speed position in
the tachometer.
If the selector lever is shifted out of
neutral before depressing the clutch
first, control indicator - illuminates
or is shown as a symbol in the Driver Information Centre.
Control indicator - 3 85.Vehicles with manual transmission
automated:
Release the brake pedal or move
selector lever out of D to restart the
engine.
The engine start is indicated by the
needle at the idle speed position in
the tachometer.
Restart of the engine by the stop-
start system
The selector lever must be in neutral
to enable an automatic restart.
Page 183 of 239
Vehicle care181No.Circuit1–2–3Power windows4Voltage transformer5Body control module 16Body control module 27Body control module 38Body control module 49Body control module 510Body control module 611Body control module 712Body control module 813–14Tailgate15Diagnostic connector16Data link connection17IgnitionNo.Circuit18Air conditioning system19Audio amplifier20Parking assist21Brake switch22Audio system23Display24–25Onstar26Instrument panel27Seat heating, driver28–29–30Instrument panel31Horn32Seat heating, passenger33Heated steering wheel34–No.Circuit35–36–37Rear wiper38Cigarette lighter39–40–