Mercedes-Benz C-Sedan 2014 Owners Manual - Manual (Page 81)

Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention
immediately.
Checking the battery
X Press the & or % button.
The battery is working properly if battery
check lamp : lights up briefly.
If battery check lamp : does not light up
briefly during the test, the battery is
discharged.
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
X Change the battery (
Y
page 79).
i You can get a battery at a 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 78).
X Press mechanical key ; into the SmartKey
opening in the direction of the arrow until
battery compartment cover : opens. Do
not hold battery compartment cover :
closed while doing so.
X Remove battery compartment cover :.
X Repeatedly tap the SmartKey against your
palm until battery = falls out.
X Insert the new battery with the positive
terminal facing upwards. Use a lint-free
cloth to do so.
X Make sure that the surface of the battery is
free from lint, grease and all other forms of
contamination.
X
Insert the front tabs of battery
compartment cover : into the housing
first and then press to close it.
X Insert mechanical key ; into the
SmartKey.
X
Check the function of all SmartKey buttons
on the vehicle.
SmartKey
79
Opening
and
closing
Z