
853-1. CONTROLS
3
CONTROLS
the following circumstances:
• The battery of the vehicle key is discharged. For replacing
the battery, refer to page 84.
• Interference of the radio con- nection from transmission
towers or other equipment
with high transmitting power.
• Shielding of the remote con- trol due to metal objects.
Do not transport the remote control
together with metal objects.
• Interference of the radio con-nection from mobile phones
or other electronic devices in
direct proximity to the remote
control.
Do not transport the remote control
together with elec tronic devices.
• Interference of radio transmis-
sion by a charging process of
mobile devices, for instance
charging of a mobile phone.
• The remote control is in direct proximity of the wireless
charging tray.
Place the remote control down at a
different location.
In the case of interference, the
vehicle can be unlocked and
locked from the outside with the
integrated key, refer to page 86. It is not possible to switch on the
drive-ready state if the remote
control has not been detected.
Proceed as follows in this case:
1
Hold the remote control with
its back against the marked
area on the steering column.
Pay attention to the display in
the instrument cluster.
2 If the remote control is
detected: Switch on
drive-ready state within 10
seconds.
If the remote control is not
detected, slightly change the
position of the remote control
and repeat the procedure.
What precautions can be taken
to be able to open a vehicle with
an accidentally locked in remote
control?
• The options provided by the Switching the drive-ready
state on via emergency
detection of the remote con-
trol
Frequently asked ques-
tions

883-1. CONTROLS
• Pull the door handle on the door to open the door. The
other doors remain locked.
• Press the button to unlock all the doors. Pull the
door opener.
The vehicle can be accessed
without operating the vehicle
key.
Carrying the vehicle key with
you, e.g., in your pants pocket,
is sufficient.
The vehicle automatically
detects the remote control when
it is in close proximity or in the
car's interior.
Comfort entry supports the fol-
lowing functions:
• Unlocking and locking the vehicle from the door handle.
• To lock the vehicle, the remote control must be
located outside of the vehicle
near the doors.
• The next unlocking and lock- ing cycle is not possible until after approx. 2 seconds.
The driver should always
carry the remote control on
their person and take it with
them when they leave the
vehicle.
Depending on the location of
the vehicle or the surround-
ing radio wave conditions, the
remote control may not oper-
ate normally. Make sure not to
carry the remote control with
an electronic device, such as
a mobile phone or computer.
Make sure to always take the
remote control with you when
you leave the vehicle, in case
the battery of the remote con-
trol is depleted or the remote
control is malfunctioning.
Opening
Smart Key System
Concept
General information
Functional requirements
Important points

953-1. CONTROLS
3
CONTROLS
3"Doors/Key"
4 "Turn off after door opening"
Opening the front doors establishes
the idle state, refer to page 45.
The alarm system issues a
visual and acoustic signal when
someone attempts to open the
locked vehicle incorrectly.
When the vehicle is locked, the
vehicle alarm system reacts to
the following changes:
• Opening a door, the hood or
the trunk lid.
• Movements in the car's inte- rior.
• Changes in the vehicle tilt, e. g., during attempts at stealing
a wheel or when towing the
vehicle.
• Disconnected battery voltage.
• Improper use of the socket for OBD Onboard Diagnosis.
• Locking the vehicle while a device is connected to the
socket for the OBD Onboard-
Diagnosis. For socket for the
OBD Onboard Diagnosis,
refer to page 309.
The alarm system signals the
following changes visually and
acoustically:
• Acoustic alarm: Depending on local regulations, the acoustic
alarm may be suppressed.
• Visual alarm: By flashing of the hazard warning system
and headlights, where
required.
Do not modify the system to
ensure function of the alarm
system.
When you unlock and lock the
vehicle, either with the remote
control or with Comfort entry, the
alarm system is switched off and
on at the same time.
The alarm system is triggered
when a door is opened if the
door was unlocked using the
integrated key in the door lock.
Switching off the alarm, refer to
page 97.
The trunk lid can be opened
even when the alarm system is
switched on.
After the trunk lid is closed, it is
locked and monitored again pro-
vided the doors are locked. The
hazard warning system flashes
Alarm system
Concept
General information
Switching on/off
Opening the doors with
the alarm system switched
on
Opening the trunk lid with
the alarm system switched
on

1213-1. CONTROLS
3
CONTROLS
required level.
Where there is a risk of win-
dow condensation when the
automatic air conditioning is
switched on.
Engine or other parts not at
operating temperature.
Engine cooling is required.
The wheels are at a sharp
angle or the steering wheel is
being turned.
Vehicle battery is heavily dis-
charged.
At higher elevations.
The hood is unlocked.
The parking assistant is acti-
vated.
Stop-and-go traffic.
Selector lever position in N or
R.
After driving in reverse.
Use of fuel with high ethanol
content.
Manual transmission
The engine starts automatically
under the following precondi-
tions:
By releasing th e clutch pedal.
Automatic transmission
The engine starts automatically under the following precondi-
tions:
By releasing the brake pedal.
After the engine starts, acceler-
ate as usual.
After the engine switches off
automatically, it will not start
again automatically if any one of
the following conditions are met:
The driver's safety belt is
unbuckled and the driver's
door is open.
The hood was unlocked.
Some indicator lights light up for
a varied length of time.
The engine can only be started
via the Start/Stop button.
Even if driving off was not
intended, the deactivated
engine starts up automatically in
the following situations:
Excessive warming of the
car's interior when the air con-
ditioning is switched on.
Excessive cooling of the car's
interior when the heating is
switched on.
Where there is a risk of win-
dow condensation when the
Starting the engine
Functional requirements
Driving off
Safety mode
System limits

1223-1. CONTROLS
automatic air conditioning is
switched on.
The steering wheel is turned.
Change from selector lever
position D to N or R.
Change from selector lever
position P to N, D, or R.
Vehicle battery is heavily dis-
charged.
Start of an oil level measure-
ment.
Depending on the vehicle equip-
ment and country-specific ver-
sion, the vehicle features a
variety of sensors for assessing
the traffic situation. The Auto
Start/Stop function uses this
information to adapt to various
traffic situations in a proactive
manner.
For instance, this applies to the
following situations:
If a situation is detected in
which the stopping time is
expected to be very short, the
engine is not switched off
automatically. A message
appears on the Control Dis-
play, depending on the situa-
tion.
If a situation is detected in
which the vehicle needs to
drive off immediately, the
engine is started automati- cally.
The function may be restricted if
the navigation data is invalid,
outdated or not available, for
example.
The engine is not automatically
switched off.
The engine is started during an
automatic engine stop.
Press the button.
The Auto Start/Stop function is
also deactivated in selector
lever position M.
The Auto Start/Stop function is
also deactivated in SPORT driv-
ing mode of the Sport mode
Additional functions Auto
Start/Stop
Activating/deactivating the
system manually
Concept
Using the button
Via selector lever position
Via the Sport mode switch

1583-1. CONTROLS
The parking lights can only be
switched on in the low speed
range.
The vehicle is illuminated on all
sides.
Do not use the parking lights for
extended periods; otherwise,
they might drain the battery and
it would then be impossible to
switch on drive-ready state.
After the drive-ready state is
switched on, the automatic
headlight control will be acti-
vated.The low beams illuminate when
drive-ready state is switched on.
Press the button again to switch
on the low beams when the
standby state is switched on.
Depending on the country vari-
ant, the low beams can be
switched off in the low speed
range.
Depending on the surrounding
conditions, the low beam head-
lights may not be able to be
turned off.
When the vehicle is parked, a
one-sided roadside parking light
can be switched on.
Parking lights
General information
Switching on
Press the button on the
light switch element.
The indicator light in the
instrument cluster lights
up.
Switching off
Press the button on the
light switch element or
switch on the
drive-ready state.
Low beams
Switching on
Press the button on the
light switch element.
The indicator light in the
instrument cluster lights
up.
Switching off
Press the button on the
light switch element.
Roadside parking lights

2373-1. CONTROLS
3
CONTROLS
recirculated.
To prevent window fogging,
recirculated-air mode switches
off automatically after a certain
amount of time, depending on
the environmental conditions.
With constant recirculated-air
mode, the air quality in the car's
interior deteriorates and the fog-
ging of the windows increases.
If there is window condensation,
switch off recirculated-air mode
or defog the windows, refer to
page 237.
The air flow for climate control
can be adjusted manually.
To manually adjust air flow
switch off AUTO program first.
The selected air flow is shown
on the climate control display.
The air flow may be reduced
automatically to save battery
power.The air distribution for climate
control can be adjusted manu-
ally.
Windows, upper body region,
and floor area.
Upper body region and floor
area.
Floor area.
Windows and floor area.
Windows.
Windows and upper body.
Upper body region.
The selected air distribution is
shown on the climate control
display.
If there is window condensation,
defog the windows, refer to
page P.237.
Ice and condensation are
Controlling the air flow
manually
Concept
General information
Operation
Press the left or right
side of the button:
decrease or increase air
flow.
Controlling the air distri-
bution manually
Concept
Operation
Press the button repeat-
edly to select a program:
Defrost windshield and
remove condensation
Concept

2393-1. CONTROLS
3
CONTROLS
Lever for changing the air flow
direction, arrow 1.
Thumbwheel for variable
opening and closing of the
vents, arrow 2.
The car's interior can be cooled
or heated before driving off with
the parked-car ventilation.
Depending on set temperature
and ambient temperature, the
car's interior is ventilated or pos-
sibly heated using the residual
engine heat.
The system can be switched on
and off directly or via a preset
departure time.
The activation time is deter-
mined based on the external
temperature. The system
promptly switches on before the
selected departure time.
The vehicle is in idle state or
standby state and not in
drive-ready state.
Battery is sufficiently charged.
If parked-car ventilation is switched
on, the vehicle ba ttery will be dis-
charged. Thus, limit the maximum
activation time to save the vehicle
battery. The system will be avail-
able again after the engine is
started or after a short trip.
Make sure that the vehicle's
date and time are set cor-
rectly.
Open the vents to allow air to
flow out.
There are different ways to
switch the system on or off.
The system switches off auto-
matically after a certain period of
time. The system continues to
run for some time after being
switched off.
■General information
When the vehicle is in standby
state, the parked-car ventilation
can be switched on or off via the
automatic air conditioning but-
tons.
Front ventilation
Parked-car ventilation
Concept
General information
Functional requirements
Switching on/off directly
General information
Using the button