Doors - Mercedes-Benz C-Class Saloon 2022 Owner's Manual

Problems with the key, troubleshooting
You can no longer lock or unlock the vehicle
Possible causes:
The key battery is weak or discharged.
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Check the battery using the indicator lamp
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( page 75).
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Replace the key battery, if necessary
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( page 77).
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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 82).
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Have 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
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mobile phones
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electronic devices (notebooks, tablets)
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shielding due to metal objects or induction
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loops for electrical gate systems or automatic
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 vehi-
cles for the United Kingdom.
Opening and closing
& 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 not
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activate the additional door lock.
The additional door lock is automatically activated
in the following situations:
The vehicle is locked using the key.
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The vehicle is locked using KEYLESS-GO.
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If the vehicle has been locked via Mercedes me
connect, the additional door lock is not activated
( page 362).
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If the additional door lock is activated, the doors
cannot be opened from the inside.
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After locking you can issue a signal with the
horn.
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