Get Opening and closing -> Doors Guide for Mercedes C Class 4 Door Fourth Generation (2014-2021)

Opening and closing 73

#

There is interference from a powerful radio

signal source

Insert the new battery into battery compart‐

ment 3. Observe the positive pole marking

in the battery compartment and on the bat‐

tery when doing this.

Doors

Notes on the additional door lock

The key function is impaired by, for example:

The additional door lock is only available for

vehicles for the United Kingdom.

R

high voltage power lines

#

Push in battery compartment 3.

R

mobile phones

Re-attach cover 1 and push it until it

engages.

&

WARNING Risk of injury to persons

inside the vehicle when the additional

door lock is activated

R

electronic devices (Notebooks, Tablets)

R

shielding due to metal objects or induction

loops for electrical gate systems or auto‐

matic barriers

Problems with the key

If the additional door lock is activated, the

doors can no longer be opened from the

inside.

You can no longer lock or unlock the vehicle

#

Make sure that there is a sufficient distance

Possible causes:

R

between the key and the potential source of

interference.

#

Never leave persons, in particular chil‐

dren, unattended in the vehicle.

The key battery is weak or discharged.

The key is faulty.

R

You have lost a key

#

If there are persons in the vehicle, do

not activate the additional door lock.

#

Have the key deactivated at a qualified spe‐

cialist workshop.

#

Check the battery using the indicator lamp

(/ page 70).

Replace the key battery, if necessary

(/ page 72).

Use the emergency key to lock or unlock

(/ page 71).

Have the key checked at a qualified specialist

workshop.

The additional door lock is automatically activa‐

ted in the following situations:

#

If necessary, have the mechanical lock

replaced as well.

#

R

The vehicle is locked using the key.

R

The vehicle is locked using KEYLESS-GO.

74 Opening and closing

Centrally locking and unlocking the vehicle

from the inside

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 (/ page 94).

Unlocking/opening the doors from the inside

#

United Kingdom only: observe the notes on

the additional door lock (/ page 73).

#

Pull door handle 2.

Locking pin 1 pops up when the door is

unlocked.

#

To unlock: press button 1.

#

To lock: press button 2.

This does not lock or unlock the fuel filler flap.

The vehicle is not unlocked:

R

If you have locked the vehicle using the key.

Opening and closing 75

R

Locking/unlocking the vehicle with KEY‐

LESS-GO

If you have locked the vehicle using KEY‐

LESS-GO.

Requirements:

Locking/unlocking the vehicle with a Digital

Vehicle Key sticker

R

The key is outside the vehicle.

R

The distance between the key and the vehicle

does not exceed 1 m.

Requirements:

R

the vehicle is equipped with the "Digital Vehi‐

cle Key" function

R

The driver's door and the door at which the

door handle is used are closed.

R

a Digital Vehicle Key sticker is present

% Affix the Digital Vehicle Key sticker to your

smartphone; see the Supplement.

% Mercedes-Benz recommends that you carry

the emergency key in case of function

restrictions.

If the vehicle has been parked for longer than

two weeks, the NFC antenna in the door handle

is deactivated.

#

Touch the door handle on the driver's door in

the area where NFC antenna 1 is located

with the part of the Digital Vehicle Key

sticker where the NFC transmitter is located.

The vehicle is locked or unlocked alternately.

#

Pull the door handle.

The NFC antenna is activated.

76 Opening and closing

#

Activating/deactivating the automatic lock‐

ing feature

To unlock the vehicle: touch the inner sur‐

face of the door handle.

To lock the vehicle: touch sensor surface

1 or 2.

Check the battery using the indicator lamp

(/ page 70).

#

Replace the key battery, if necessary

(/ page 72).

Use the emergency key to lock or unlock

(/ page 77).

Have the vehicle and key checked at a quali‐

fied specialist workshop.

The vehicle is locked automatically when the

ignition is switched on and the wheels are turn‐

ing faster than walking pace.

#

Convenience closing: touch recessed sen‐

sor surface 2 until the closing process has

been completed.

% Further information on convenience closing

(/ page 85).

If you open the boot lid from outside, the boot lid

is automatically unlocked.

There is interference from a powerful radio

signal source

The KEYLESS-GO function is impaired by, for

example:

Problems with KEYLESS-GO

R

high voltage power lines

R

mobile phones

electronic devices (Notebooks, Tablets)

You can no longer lock or unlock the vehicle

using KEYLESS-GO.

R

Possible causes:

R

shielding due to metal objects or induction

loops for electrical gate systems or auto‐

matic barriers

R

The key functions have been deactivated.

The key battery is weak or discharged.

R

#

Make sure that there is a sufficient distance

between the key and the potential source of

interference.

R

The key is faulty.

#

To activate: press and hold button 2 for

approximately five seconds until an acoustic

signal sounds.

#

Activate the key functions (/ page 71).

Opening and closing 77

#

To deactivate: press and hold button 1 for

approximately five seconds until an acoustic

signal sounds.

In the following situations, there is a danger of

being locked out when the function is activated:

R

While the vehicle is being tow started/

pushed.

R

If the vehicle is being tested on a roller dyna‐

mometer.

Locking/unlocking the driver's door with the

emergency key

% If you wish to lock the vehicle entirely using

the emergency key, first press the button for

locking from the inside while the driver's

door is open. Then proceed to lock the driv‐

er's door using the emergency key.

#

Remove the emergency key (/ page 71).

Insert the emergency key as far as it will go

into opening 1 in the cover.

To unlock: turn the emergency key anti-

clockwise to position 1.

To lock: turn the emergency key clockwise to

position 1.

Carefully press the cover onto the lock cylin‐

der until it engages and is seated firmly.

#

Pull and hold the door handle.

Pull the cover on the emergency key as

straight as possible away from the vehicle

until it releases.

#

Release the door handle.

Opening and closing -> Doors for Your Mercedes C Class 4 Door Fourth Generation (2014-2021)

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