Mercedes-Benz C-Class Operator's Manual page 88

SmartKey
86
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 84).
Y
If this does not work:
Unlock ( page 89) or lock (
X
Y
mechanical key.
There is interference from a powerful source of radio waves.
Unlock ( page 89) or lock (
X Y
mechanical key.
The SmartKey is faulty.
Unlock ( page 89) or lock (
X
Y
mechanical key.
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 84).
Y
If this does not work:
Unlock ( page 89) or lock (
X
Y
mechanical key.
There is interference from a powerful source of radio waves.
Unlock ( page 89) or lock (
X
Y
mechanical key.
KEYLESS-GO is malfunctioning.
Lock/unlock the vehicle using the remote control function of the
X
SmartKey.
Have the vehicle and SmartKey checked at a qualified specialist
X
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
Unlock ( page 89) or lock (
X
Y
mechanical key.
Have the vehicle and SmartKey checked at a qualified specialist
X
workshop.
page 84) and replace it if necessary
Y
page 89) the vehicle using the
Y
page 89) the vehicle using the
Y
page 89) the vehicle using the
Y
page 82).
Y
page 84) and replace it if necessary
Y
page 89) the vehicle using the
Y
page 89) the vehicle using the
Y
page 89) the vehicle using the
Y