Marquardt DC12BA, DC12KA Users Manual

[ C-Class Owner's Manual | Opening and closing | Key ]

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Owner's Manual version: AEJ2017-1a

Print date: 12/12/2018

Note
The online Owner's Manual is always the current version. Possible variations to your vehicle may not be taken into
account as Mercedes-Benz constantly updates their vehicles and equipment to the state of the art and introduces
changes in design and equipment. Please note that this online Owner's Manual does not replace the printed Owner's
Manual which was included when the vehicle was delivered.

Key

Content

Important safety notes

Key functions

KEYLESS-GO

KEYLESS-GO start function

Changing the settings of the locking system

Emergency key element

Key battery

Problems with the key

Important safety notes

United Kingdom only:

WARNING

When the double locks are activated, the doors can no longer be opened from the inside. People in the vehicle
can no longer get out, e.g. in hazardous situations. There is a risk of injury.

Therefore, do not leave any people unsupervised in the vehicle, particularly children, elderly people or people
in need of special assistance. Do not activate the double lock when people are in the vehicle.

If the vehicle has been locked from the outside, the double lock function is activated as standard. It is then not possible to
open the doors from inside the vehicle. You can deactivate the double lock function by deactivating the interior motion
sensor (see Digital Owner's Manual). The doors can then be opened from the inside after the vehicle has been locked
from the outside. The anti-theft alarm system is triggered if the door is opened from the inside. Switch off the alarm .

All countries:

WARNING

If children are left unsupervised in the vehicle, they could:

• open doors, thereby endangering other persons or road users

• get out and be struck by oncoming traffic

• operate vehicle equipment and become trapped, for example

In addition, the children could also set the vehicle in motion, for example, if they:

• release the parking brake

• shift the automatic transmission out of park position P or shift manual transmission into neutral

• start the engine

There is a risk of an accident and injury.

When leaving the vehicle, always take the key with you and lock the vehicle. Never leave children and animals
unattended in the vehicle. Keep the keys out of the reach of children.

WARNING

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If you attach heavy or large objects to the key, the key could be unintentionally turned in the ignition lock. This
could cause the engine to be switched off. There is a risk of an accident.

Do not attach any heavy or large objects to the key. Remove any bulky keyrings before inserting the key into
the ignition lock.

Keep the key away from strong magnetic fields. Otherwise, the remote control function could be affected.

Strong magnetic fields can occur in the vicinity of powerful electrical installations.

Do not store the key:

• with electronic devices, e.g. a mobile phone or another key

• with metallic objects, e.g. coins or metal foil

• inside metallic objects, e.g. a metal case

This can impair the key's function.

Vehicles with KEYLESS-GO start function: do not keep the key on the parcel shelf or in the boot. Otherwise, the key may
not be detected, e.g. when starting the engine using the Start/Stop button.

A check that periodically establishes a radio connection between the vehicle and the key determines whether a valid key
is in or in the direct vicinity of the vehicle. This occurs, for example:

• while starting the engine

• during driving

• when using HANDS-FREE ACCESS

• when the external door handles are touched

• during convenience closing

Key functions

Locks the vehicle

Opens/closes the boot lid

Unlocks the vehicle

To unlock centrally: press the button.

If you do not open the vehicle within approximately 40 seconds of unlocking:

• the vehicle locks again

• protection against theft is reactivated

To lock centrally: press the button.

The key centrally locks and unlocks the following components:

with the key (see Digital Owner's Manual).

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• the doors

• the boot lid

• the fuel filler flap

During unlocking, the turn signals flash once. During locking, they flash three times.

You can also set an audible signal to confirm that the vehicle has been locked. The audible signal can be activated and
deactivated via the multimedia system (see Digital Owner's Manual).

Only when all the components have been locked is the visual or audible locking confirmation issued.

When the locator lighting is activated via the multimedia system, it lights up when it is dark after the vehicle is unlocked

To open the boot lid automatically from outside the vehicle: press and hold the button until the boot lid opens.

To close the boot lid automatically from outside the vehicle: if the key is located in the immediate vicinity of the vehicle,

press the button on the key.

When the boot lid closes you can then release the button.

KEYLESS-GO

General notes

Bear in mind that the engine can be started by any of the vehicle occupants if there is a key in the vehicle .

Locking and unlocking centrally

You can start, lock or unlock the vehicle using KEYLESS-GO. To do this, you need to carry the key with you. You can
combine the KEYLESS-GO functions with the functions of a conventional key. Unlock the vehicle using KEYLESS-GO, for

instance, and lock it using the button on the key.

The driver's door and the door on which the handle is used must both be closed. The key must be outside the vehicle.
When locking or unlocking with KEYLESS-GO, the distance between the key and the corresponding door handle must not
be greater than 1 m.

A check that periodically establishes a radio connection between the vehicle and the key determines whether a valid key
is in or in the direct vicinity of the vehicle. This occurs, for example:

• while starting the engine

• while driving

• when using HANDS-FREE ACCESS

• when the external door handles are touched

• during convenience closing

To unlock the vehicle: touch the inner surface of the door handle.

To lock the vehicle: touch sensor surface or .

Make sure that you do not touch the inner surface of the door handle.

Convenience closing feature: touch recessed sensor surface for an extended period.

Further information on the convenience closing feature .

To unlock the boot lid: pull the boot lid handle.