Mercedes-Benz 2013 M Class - Manual (Page 83)

ignition lock. The SmartKey must be in the
vehicle.
or
X Lock or unlock the vehicle using KEYLESS-
GO. The SmartKey must be outside the
vehicle.
If you unlock the vehicle using the mechanical
key, the fuel filler flap will not be unlocked
automatically.
X To unlock the fuel filler flap: insert the
SmartKey into the ignition lock.
Removing the mechanical key
:
Release catch
;
Mechanical key
X Push release catch : in the direction of
the arrow and at the same time remove
mechanical key ; from the SmartKey.
SmartKey battery
Important safety notes
G
WARNING
Batteries contain toxic and corrosive
substances. If batteries are swallowed, it can
result in severe health problems. There is a
risk of fatal injury.
Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention
immediately.
Mercedes-Benz recommends that you have
the batteries replaced at a qualified specialist
workshop.
Checking the battery
X Press the & or % button.
The battery is working properly if battery
check lamp : lights up briefly.
The battery is discharged if battery check
lamp : does not light up briefly.
X Change the battery ( Y page 81).
i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the & or % button:
R
locks or
R
unlocks the vehicle
i You can get a battery at any qualified
specialist workshop.
Replacing the battery
You require a CR 2025 3 V cell battery.
X Take the mechanical key out of the
SmartKey (
Y page 80).
SmartKey
81
Opening and closing
Z