Mercedes-Benz C-Class Coupe 2019 Operator's Manual page 65

If the vehicle is not opened within approximately
40 seconds after unlocking, it locks again. Anti-
theft protection is activated again.
Do not keep the SmartKey together with elec‐
tronic devices or metal objects. This can affect
the SmartKey's functionality.
% If battery check lamp 2 does not light up
after pressing the % or & button, the
battery is discharged.
Replacing the SmartKey battery
( page 64).
/
Activating/deactivating the acoustic locking
verification signal
Multimedia system:
Vehicle î Vehicle Settings
4 5
Acoustic Lock
5
Activate O or deactivate ª the function.
#
Activating/deactivating the panic alarm
Requirements:
The ignition is switched off
R
% The panic alarm function is only available in
certain countries.
To activate: press button 1
#
imately one second.
A visual and audible alarm is triggered.
To deactivate: briefly press button
#
or
Press the start/stop button on the cockpit
#
(the SmartKey is inside the vehicle).
Changing the unlocking settings
Possible unlocking functions of the SmartKey:
Central unlocking
R
Unlocking the driver's door and fuel filler flap
R
To switch between settings: press the
#
% and & buttons simultaneously for
approximately six seconds until the battery
check lamp flashes twice.
If the unlocking function for the driver's door
and fuel filler flap has been selected:
Pressing the % button a second time cen‐
R
trally unlocks the vehicle
Vehicles with KEYLESS-GO: If you touch
R
the inner surface of the door handle on the
driver's door, only the driver's door and fuel
for approx‐
filler flap are unlocked.
1 again. Deactivating the SmartKey functions
If you do not use the vehicle or a SmartKey for
an extended period of time, you can reduce the
energy consumption of the respective Smart‐
Key . To do so, deactivate the SmartKey func‐
tions.
63
Opening and closing