Mercedes-Benz C-Class Convertible 2021 Operator's Manual page 70

68 Opening and closing
To unlock the vehicle: touch the inner sur‐
#
face of the door handle.
To lock the vehicle: touch sensor surface
#
1 or 2.
Convenience closing: touch recessed sen‐
#
sor surface 2 until the closing process has
been completed.
% Further information on convenience closing
( page 81).
/
If you open the trunk lid from outside, the trunk
lid is automatically unlocked.
Problems with KEYLESS-GO, troubleshooting
You can no longer lock or unlock the vehicle
using KEYLESS-GO
Possible causes:
The SmartKey functions have been deactiva‐
R
ted.
The SmartKey battery is weak or discharged.
R
Activate the SmartKey functions
#
( page 64).
/
Check the battery using the indicator lamp
#
( page 63).
/
Replace the SmartKey battery, if necessary
#
( page 65).
/
Use the replacement SmartKey.
#
Use the emergency key to lock or unlock
#
( page 69).
/
Have the vehicle and SmartKey checked at a
#
qualified specialist workshop.
There is interference from a powerful radio
signal source.
The KEYLESS-GO function is impaired by, for
example:
High voltage power lines
R
Mobile phones
R
Electronic devices (notebooks, tablets)
R
Shielding due to metal objects or induction
R
loops for electrical gate systems or auto‐
matic barriers
Make sure that there is sufficient distance
#
between the SmartKey and the potential
source of interference.
Activating/deactivating the automatic lock‐
ing feature
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn‐
ing faster than walking pace.