Replacing; Checking The Battery - Mercedes-Benz C-Class Operator's Manual

Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention
immediately.

Checking the battery

Press the & or % button.
X
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:
locks or
R
unlocks the vehicle
R
Change the battery (
X
i
You can get a battery at a qualified
specialist workshop.
Replacing the battery
You require a CR 2025 3 V cell battery.
Take the mechanical key out of the
X
SmartKey ( page 78).
Y
page 79).
Y
Press mechanical key ; into the SmartKey
X
opening in the direction of the arrow until
battery compartment cover : opens. Do
not hold battery compartment cover :
closed while doing so.
Remove battery compartment cover :.
X
Repeatedly tap the SmartKey against your
X
palm until battery = falls out.
Insert the new battery with the positive
X
terminal facing upwards. Use a lint-free
cloth to do so.
Make sure that the surface of the battery is
X
free from lint, grease and all other forms of
contamination.
Insert the front tabs of battery
X
compartment cover : into the housing
first and then press to close it.
Insert mechanical key ; into the
X
SmartKey.
Check the function of all SmartKey buttons
X
on the vehicle.
SmartKey
79
Z