Doors - Mercedes-Benz C-Class Wagon Owner's Manual

Check the battery using the indicator lamp
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( page 71).
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Replace the key battery, if necessary
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( page 73).
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Use the replacement key.
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Use the emergency key to lock or unlock
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( page 78).
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Have the key checked at a qualified specialist
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workshop.
There is interference from a powerful radio
signal source
Possible causes if the function of the key is
impaired:
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
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between the key and the potential source of
interference.
You have lost a key
Have the key deactivated at a qualified spe‐
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cialist workshop.
If necessary, have the mechanical lock
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replaced as well.

Doors

Notes on the additional door lock
The additional door lock is only available for
vehicles for the United Kingdom.
& WARNING Risk of injury to persons
inside the vehicle when the additional
door lock is activated
If the additional door lock is activated, the
doors can no longer be opened from the
inside.
Never leave persons, in particular chil‐
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dren, unattended in the vehicle.
If there are persons in the vehicle, do
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not activate the additional door lock.
Opening and closing
The additional door lock is automatically activa‐
ted in the following situations:
The vehicle is locked using the key.
R
The vehicle is locked using KEYLESS-GO.
R
If the vehicle has been locked via Mercedes me
connect, the additional door lock is not activa‐
ted.
If the additional door lock is activated, the doors
cannot be opened from the inside.
% After locking you can issue a signal with the
horn.
You can prevent the additional door lock from
being activated by deactivating interior protec‐
tion before locking the vehicle (
Unlocking/opening the doors from the inside
United Kingdom only: observe the notes on
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the additional door lock (
/
75
page 94).
/
page 75).