Keys, doors and windows23Notice
Do not put the electronic key in the
load compartment or in front of the
Info-Display.
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 a
message in the Driver Information
Centre 3 119.
Battery replacement, see 'Radio
remote control' 3 21.
Electronic key synchronisation
The electronic key 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 electronic key.
● Electronic key is out of reception range.
● The battery voltage is too low.
● Overload of the central locking system by operating at frequent
intervals; the power supply is
interrupted for a short time.
● Interference from higher-power radio waves from other sources.
To rectify the cause of the fault,
change the position of the electronic
key.
Manual unlocking 3 24.
Memorised settings
Whenever the ignition is switched off, the following settings are
automatically memorised by the
remote control unit or the electronic
key:● automatic climate control
● lighting
● Infotainment system
● central locking system
● Sport mode settings
● comfort settings
The saved settings are automatically used the next time the ignition is
switched on with the memorised key
with remote control unit 3 155 or
electronic key 3 22.
A precondition is that Personalisation
by Driver is activated in the personal
settings of the Info-Display. This must
be set for each remote control unit or
electronic key which is used.
Also memorised are the adjustments
of the driver's seat and exterior
mirrors, independent of the memory
positions 3 50.
Power seat automatically moves into the saved position when unlocking
and opening the driver's door with the
memorised remote control or
electronic key and Auto Memory
Recall in the Info-Display is activated.
Vehicle personalisation 3 120.
120Instruments and controls● If an unintended lane changeoccurs.
● If the diesel particle filter has reached the maximum filling
level.
● If safety function of the power tailgate detects obstacles in the
moving area.
When the vehicle is parked and/or the driver's door is opened
● With exterior lights on.
● If the trailer hitch is not engaged.
During an Autostop ● If the driver's door is opened.
● If any condition for an autostart is
not fulfilled.
Battery voltage
When the vehicle battery voltage is
running low, a warning message will
appear in the Driver Information
Centre.1. Switch off any electrical consumers which are not requiredfor a safe ride, 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 will disappear
after the engine has been started
twice 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 by changing the settings in the Colour-Info-Display.
Some of the personal settings for
different drivers can be memorised
individually for each vehicle key.
Memorised settings 3 23.
Depending on vehicle equipment and
country-specific regulations some of
the functions described below might
not be available.
Some functions are only displayed or
active when the engine is running.
Personal settings Following the changing of personal
settings is described via the buttons
below the display. This is valid for
4.2'' as well as 8'' Colour-Info-Display.
Additionally, the 8'' display is operable
as a touchscreen. See description
'Colour-Info-Display' 3 117 and the
Infotainment manual.
