Mercedes-Benz C-Class 2017 Operator's Manual page 84

SmartKey
82
Repeatedly tap the SmartKey against your
X
palm until 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 contaminants.
Insert the front tabs of battery compartment
X
cover : into the housing first and then press
to close it.
Problems with the SmartKey
Problem
You can no longer lock or
unlock the vehicle using
the SmartKey.
You can no longer lock or
unlock the vehicle using
KEYLESS-GO.
Possible causes/consequences and M Solutions
The SmartKey battery is discharged or nearly discharged.
Check the SmartKey battery (
X
( page 81).
Y
If this does not work:
Lock or unlock the vehicle using the mechanical key (
X
There is interference from a powerful source of radio waves.
Lock or unlock the vehicle using the mechanical key (
X
The SmartKey is faulty.
Lock or unlock the vehicle using the mechanical key (
X
Have the SmartKey checked at a qualified specialist workshop.
X
KEYLESS-GO was deactivated.
Reactivate KEYLESS-GO (
X
The SmartKey battery is discharged or nearly discharged.
Check the SmartKey battery (
X
( page 81).
Y
If this does not work:
Lock or unlock the vehicle using the mechanical key (
X
There is interference from a powerful source of radio waves.
Lock or unlock the vehicle using the mechanical key (
X
Insert mechanical key ; into the SmartKey
X
( page 80).
Y
Check the function of all SmartKey buttons on
X
the vehicle.
page 81) and replace it if necessary
Y
page 79).
Y
page 81) and replace it if necessary
Y
page 85).
Y
page 85).
Y
page 85).
Y
page 85).
Y
page 85).
Y