Mercedes-Benz C-Clas 2016 Owner's Manual page 88

Press emergency key element ; into the
X
opening in the key in the direction of the arrow
until battery compartment cover : opens.
When doing so, do not hold battery compart-
ment cover : shut.
Remove battery compartment cover :.
X
Problems with the key
Problem
You can no longer lock or
unlock the vehicle using
the key.
Possible causes/consequences and M M Solutions
The key battery is weak or discharged.
Check the key battery (
X
( page 84).
Y
If this does not work:
Lock or unlock the vehicle using the emergency key element
X
( page 89).
Y
Interference from a powerful source of radio waves.
Lock or unlock the vehicle using the emergency key element
X
( page 89).
Y
The key is faulty.
Lock or unlock the vehicle using the emergency key element
X
( page 89).
Y
Have the key checked at a qualified specialist workshop.
X
Repeatedly tap the key against your palm until
X
battery = falls out.
Insert the new battery with the positive ter-
X
minal facing upwards. Use a lint-free cloth to
do so.
Make sure that the surface of the battery is
X
free of lint, grease and other contamination.
Insert the front tabs of battery compartment
X
cover : into the housing and then press to
close it.
Insert emergency key element ; into the key
X
( page 84).
Y
Check the function of all key buttons on the
X
vehicle.
page 84) and replace if necessary
Y
Key
85
Z