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Mercedes C-Class Sedan 2016 Manual

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Problems with the SmartKey
Problem
Possible causes/consequences and M Solutions
You can no longer lock or
unlock the vehicle using
the SmartKey.
The SmartKey battery is discharged or nearly discharged.
X
Check the SmartKey battery (Y page 84) and replace it if necessary
(
Y page 84).
If this does not work:
X
Unlock (Y page 89) or lock (Y page 89) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves.
X
Unlock (Y page 89) or lock (Y page 89) the vehicle using the
mechanical key.
The SmartKey is faulty.
X
Unlock (Y page 89) or lock (Y page 89) the vehicle using the
mechanical key.
X
Have the SmartKey checked at a qualified specialist workshop.
You can no longer lock or
unlock the vehicle using
KEYLESS-GO.
KEYLESS-GO was deactivated.
X
Reactivate KEYLESS-GO (Y page 82).
The SmartKey battery is discharged or nearly discharged.
X
Check the SmartKey battery (Y page 84) and replace it if necessary
(
Y page 84).
If this does not work:
X
Unlock (Y page 89) or lock (Y page 89) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves.
X
Unlock (Y page 89) or lock (Y page 89) the vehicle using the
mechanical key.
KEYLESS-GO is malfunctioning.
X
Lock/unlock the vehicle using the remote control function of the
SmartKey.
X
Have the vehicle and SmartKey checked at a qualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
X
Unlock (Y page 89) or lock (Y page 89) the vehicle using the
mechanical key.
X
Have the vehicle and SmartKey checked at a qualified specialist
workshop.
86
SmartKey
Opening and closing
… 88 …


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