Page 25 of 228
In brief
25
Tyre deflation detection
system If a tyre loses pressure, it becomes
smaller. It then rotates at a different
speed than the other tyres. If the
system
detects a difference in speed,
control indicator w illuminates red.
Deflation Detection System 3 177. Tyre pressure monitoring
system
A pressure sensor is integrated in
each wheel to monitor tyre pressure.
Whilst driving, the current tyre
pressures appear in the
Board
computer menu.
Deviating tyre pressure is displayed
in the form of a message in the
Info-Display.
Tyre pressure monitoring system
3 176. Adaptive Forward Lighting
The system improves lighting of
curves and increases the headlight
range.
The beam pivots based on steering
wheel position and vehicle speed.
At higher speeds and continuous
straight ahead travel, the beam
automatically raises slightly, thereby
increasing headlight range.
Adaptive Forward Lighting
3 110.
Page 26 of 228

26
In brief
Natural gas operation This specially developed engine is
designed for the use of natural gas
and petrol.
The Y button is used to switch
between petrol and natural gas
operation.
The status of the LED indicates the
type of fuel in use.
Natural gas
operation
= LED off.
Petrol operation = LED illuminates.
Natural gas 3 84, 3 147. Diesel particle filter
The
diesel particle filter system filters
harmful soot particles out of the
exhaust gases. The system includes
a self-cleaning function that runs
automatically during driving. The filter
is cleaned by burning off the soot
particles at high temperature. This
process takes place automatically
under set driving conditions and may
take up to 25 minutes. Fuel
consumption may be higher during
this period. The emission of smells
and smoke during this process is
normal. Under certain driving conditions, e.g.
short distances, the system cannot
clean itself automatically.
If the filter requires cleaning and
previous driving conditions did not
enable automatic cleaning, control
indicator
! flashes.
Further instructions 3 129.
Page 27 of 228

Keys, doors and windows
27
Keys, doors and
windows
Keys, locks ................................... 27
Doors ........................................... 35
Vehicle security
............................ 36
Exterior mirrors ............................ 39
Interior mirrors ............................. 40
Windows ...................................... 41
Roof ............................................. 43 Keys, locks
Keys
Replacement keys
The key number is specified in the
Car Pass or on a detachable tag.
The key number must be quoted
when
ordering replacement keys as it
is a component of the immobiliser
system.
When electronic keys of the
Open&Start system are being
replaced, all keys requiring
programming must be handed over to
the dealer.
Locks 3 189, Open&Start system,
electronic keys 3 29. Key with foldaway key section
Press button to extend. To fold the
key, first press the button.
Car Pass
The Car Pass contains security
related vehicle data and should
therefore be kept in a safe place.
When
the car is taken to a workshop,
this vehicle data is needed in order to
perform certain operations.
Page 28 of 228

28
Keys, doors and windows
Radio remote control Used to operate:
■ Central locking system,
■ Anti-theft locking system,
■ Anti-theft alarm system,
■ Power windows.
The radio remote control has a range
of approx. 5 metres. This range can
be affected by outside influences.
The hazard warning flashers confirm
operation.
Handle with care, protect it from
moisture and high temperatures and
avoid unnecessary operation. Fault
If the central locking system cannot
be operated with the radio remote
control,
it may be due to the following:
■ Range exceeded,
■ Battery voltage too low,
■ Frequent, repeated operation of the remote control while not in range,
which will require re-
synchronisation,
■ Overloading the central locking by operating at frequent intervals, the
power supply is interrupted for
a short time,
■ Interference from higher-power radio waves from other sources.
Opening the vehicle 3 32.
Radio remote control battery
replacement
Replace the battery as soon as the
range reduces.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point. Key with foldaway key section
Extend the key and open the unit.
Replace the battery (battery type CR
20 32), paying attention to the
installation position. Close the unit
and synchronise.
Key with fixed key section
Have the battery replaced by
a workshop.
Page 29 of 228

Keys, doors and windows
29
Radio remote control
synchronisation
After replacing the battery, unlock the
door with the key in the lock. The radio
remote control will be synchronised
when you switch on the ignition.
Memorised settings
When locking the vehicle the last
settings are automatically saved
specifically for the used key:
■ Electronic climate control,
■ Info-Display,
■ Infotainment system,
■ Instrument panel illumination.
The saved settings are automatically
remembered when that key is used
for unlocking. Open&Start system
Makes operation of the following
possible without the use of the
mechanical key
■
Central locking system,
■ Anti-theft locking system,
■ Anti-theft alarm system,
■ Power windows,
■ Ignition and starter.
The electronic key simply needs to be
on the driver's person. Press the Start/Stop button. The
ignition
is switched on. The electronic
immobiliser and steering wheel lock
are deactivated.
To start the engine depress the brake
and clutch pedals then press and hold
the Start/Stop button.
With automatic transmission, only
start with the vehicle in P or N.
The engine and the ignition are
switched off by pressing the Start/
Stop button again. The vehicle must
be stationary. The immobiliser is
activated at the same time.
Page 30 of 228
30
Keys, doors and windows
If the ignition has been switched off
and the vehicle is stationary, the
steering wheel lock activates
automatically when the driver’s door
is opened or closed.
Control indicator 0 3 92.
Note
Do not put the electronic key in the
load compartment or in front of the
Info-Display.
The
sensor fields in the door handles
must be kept clean to ensure
unrestricted functionality.
If the battery is discharged, the
vehicle must not be towed, tow-
started or bump-started as the
steering column lock cannot be
disengaged. Radio remote control
The electronic key also has a radio
remote control feature. Emergency operation
If the radio remote control also fails,
the driver's door can be locked or
unlocked with the emergency key
contained
in the electronic key: press
locking mechanism on underside and
remove cap by applying gentle
pressure to the cap. Push emergency
key towards the outside over the
detent and remove.
Page 31 of 228
Keys, doors and windows
31The emergency key can only lock or
unlock the driver's door. Unlocking
the entire vehicle
3 32. On vehicles
with anti-theft alarm system, the
alarm may be triggered when the
vehicle is unlocked. Deactivate the
alarm by switching on the ignition. Hold the electronic key at the marked
position and press the
Start/Stop
button.
To switch off the engine, press the
Start/Stop button for at least
2 seconds.
Lock the driver's door with the
emergency key. Locking the entire
vehicle 3 32.
This option is intended for
emergencies only. Seek the
assistance of a workshop. Replacing battery in electronic
key
Replace the battery as soon as the
system no longer operates properly
or
the range is reduced. The need for
battery replacement is indicated by
InSP3 in the service display or by
a check control message in the
Info-Display 3 100.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Page 32 of 228
32
Keys, doors and windowsTo replace the battery, press the
locking mechanism and remove the
cap by applying light pressure. Press
the cap on the other side outward.
Replace the battery (battery type CR
20
32), noting the installation position.
Engage caps.
Radio remote control
synchronisation
The radio remote control
synchronises itself automatically
during every starting procedure. Fault
If the central locking cannot be
operated or the engine cannot be
started, the cause may be one of the
following:
■
Fault in remote control 3 28,
■ electronic key out of reception range.
To rectify the cause of the fault,
change the position of the electronic
key.
Central locking system
Unlocks and locks doors, load
compartment and fuel filler flap.
A pull on an interior door handle
unlocks the entire vehicle and opens
the door.
Note
In the event of an accident of
a certain severity, the vehicle
unlocks automatically. Unlocking
Radio remote control
Press button q.