Get Opening and closing -> Key Guide for Mercedes C Class 4 Door 2023

Opening and closing

142

Key

Unlocks (with embossed surface)

Opens/closes the boot lid

When leaving the vehicle, always take the

SmartKey with you and lock the vehicle.

Keep the key out of reach of children.

Overview of key functions

If indicator lamp 1 does not light up aꢀer

pressing the Ü or s button, the battery

is weak or possibly discharged. Replace the

battery as soon as possible.

WARNING Accident– and risk of injury

with unsupervised children in the vehicle

This also applies to the Digital Vehicle Key.

If you leave children unattended in the vehicle,

they can in particular

NOTE Damage to the key caused by mag-

netic ﬁelds

Replace the key battery (/ page 144).

Open doors and thereby endanger other

persons or road users.

The key locks and unlocks the following compo-

nents:

Keep the key away from strong magnetic

ﬁelds.

get out of the car and are hit by traﬃc.

Doors

Fuel ﬁller ﬂap

Socket ﬂap (plug-in hybrid)

Operate vehicle equipment and become

trapped, forexample.

In addition, the children could also set the

vehicle in motion, for exampleby:

Boot lid

If the vehicle is not opened within approximately

40 seconds aꢀer unlocking, it locks again. Anti-

theꢀ protection is primed again.

Do not keep the key together with electronic devi-

ces or metal objects. This can aﬀect the key's

functionality.

releasing the parking brake.

change the gearbox setting.

start the vehicle.

Never leave children unattended in the

vehicle.

Vehicle key

Indicator lamp

Locking

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Opening and closing

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Activating/deactivating the acoustic locking veriﬁ-

cation signal

Unlocking the driver's door and fuel ﬁller ﬂap

Plug-in hybrid: unlocking the driver's door and

fuel ﬁller ﬂap/socket ﬂap

er's door, only the driver's door and the fuel

ﬁller ﬂap/socket ﬂap are unlocked.

Multimedia system:

Deactivating the key function

Settings

Vehicle

To switch between settings: press the Ü

and s buttons simultaneously for approx-

imately six seconds until the indicator lamp

ﬂashes twice.

Open/close

If you deactivate the key function, the KEYLESS-

GO functions are also deactivated. With that key,

access or drive authorization by KEYLESS-GO is

no longer possible. Activate the function of the

key so that all its functions will again be available.

You can also deactivate the key's function to

reduce the key's energy consumption if you do

not use the vehicle or a key for an extended

period of time.

Activate or deactivate the Acoustic lock.

Please observe:

Options if the unlocking function for the driver's

door and fuel ﬁller ﬂap has been selected:

The selected setting for the acoustic locking

veriﬁcation signal must comply with the rele-

vant national road and traﬃc regulations. In

some countries, including Germany, using the

acoustic locking veriﬁcation signal is forbid-

den by traﬃc laws (in accordance with §16

Para. 1 and §30 Para. 1 of the German

national road traﬃc regulations). The driver of

the vehicle must comply with these regula-

tions. In countries where the use of this func-

tion is forbidden, this function is not activated

in the vehicle and must not be activated.

To unlock the vehicle centrally: press the

Ü button twice.

Vehicles with KEYLESS-GO: if you touch the

inner surface of the door handle on the driv-

er's door, only the driver's door and the fuel

ﬁller ﬂap are unlocked.

If you do not use the vehicle or a key for an exten-

ded period, you can also deactivate the key's

function to reduce the key's energy consumption.

Options if the unlocking function for the driver's

door and fuel ﬁller ﬂap/socket ﬂap has been

selected (plug-in-hybrid):

Press and hold the key buttons.

With the key button s pressed, immedi-

ately press the key button Ü twice in quick

succession.

The indicator light of the key lights up once

brieﬂy and once for a long time.

To unlock the vehicle centrally: press the

Ü button twice.

Vehicles with KEYLESS-GO: if you touch the

inner surface of the door handle on the driv-

Changing the unlocking settings

Possible unlocking functions of the key:

Central unlocking

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You have the following options to reactivate

the key:

Inserting the emergency key

enter the body, severe internal burns can

occur within two hours.

There is a risk of fatal injury.

Press any key on the key.

Start the vehicle with the key in the centre

Keep batteries out of the reach of chil-

dren.

console storage compartment.

(/ page 264).

If the battery compartment cover and/or

lid do not close securely, stop using the

key and keep it away from children.

If batteries are swallowed or otherwise

enter the body, seek immediate medical

attention.

Removing/inserting the emergency key

Removing the emergency key

Insert the emergency key 2 at marking 3

until it engages.

ENVIRONMENTAL NOTE Environmental

damage due to improper disposal of bat-

teries

You can use the emergency key 2 to attach

the key to a key ring.

Replacing the key battery

Batteries contain pollutants. It is illegal

to dispose of them with the household rub-

bish.

DANGER Risk of fatal injuries due to swal-

lowing batteries

Press the release button 1.

Batteries contain toxic and corrosive substan-

ces. If batteries are swallowed or otherwise

The emergency key 2 is pushed out slightly.

Fully remove the emergency key 2.

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Insert emergency key 2 into the opening and

liꢀ up covering 3 and remove it.

Repeatedly tap the key against your palm until

Dispose of batteries in an

environmentally responsible manner.

Take discharged batteries to a qualiﬁed

specialist workshop or to a collection

point for used batteries.

battery 4 falls out of the key.

Insert the new battery with the positive pole

facing upwards. Use a lint-free cloth to do so.

Make sure that the surface of the battery is

free of lint, grease and other impurities.

Insert the front tabs of covering 3 into the

housing and then press on both sides to close

it.

Make sure that covering 3 is completely

closed.

Insert the front tabs of cover 1 into the

housing and then press until it is completely

closed.

Requirements

You require a CR 2032 3 V cell battery.

Press emergency key 2 into the opening in

the key in the direction of the arrow until

cover 1 opens. When doing so, do not hold

cover 1 closed.

Mercedes-Benz recommends that you have the

battery replaced at a qualiﬁed specialist work-

shop.

Remove the emergency key (/ page 144).

Insert the emergency key again

(/ page 144).

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Problems with the key, troubleshooting

shielding due to metal objects or induction

loops for electrical gate systems or automatic

barriers

The Digital Vehicle Key can then be used for the

following functions:

You can no longer lock or unlock the vehicle

Possible causes:

Locking/unlocking the vehicle with KEYLESS-

GO (/ page 153)

Make sure that there is suﬃcient distance

between the key and the potential source of

interference.

The key battery is weak or discharged.

Locking and unlocking the vehicle with the

NFC function (/ page 150)

Check the battery using the indicator lamp

(/ page 142).

HANDS-FREE ACCESS function (/ page 159)

You have lost a key

Replace the key battery, if necessary

(/ page 144).

Convenience closing (closing the vehicle from

outside) (/ page 164)

Have the key deactivated at a qualiﬁed spe-

cialist workshop.

If necessary, have the mechanical lock

replaced as well.

Use the replacement key.

Anti-theꢀ protection (/ page 170)

Use the emergency key to lock or unlock

(/ page 154).

Starting the vehicle (/ page 261) or parking

(/ page 326)

Have key checked at a qualiﬁed specialist

Starting the vehicle with the digital vehicle key

in the storage compartment (emergency

mode) (/ page 262)

Digital Vehicle Key

Function of the Digital Vehicle Key

workshop.

There is interference from a powerful radio signal

source

Possible causes if the function of the key is

impaired:

If you have activated a suitable terminal device,

e.g. a smartphone, as a digital vehicle key, you

can use it like a conventional vehicle key.

For information on setting up a user account and

activating the "Digital Vehicle Key" service, visit

https://www.mercedes.me.

Set up and manage the digital vehicle key:

Registering the digital vehicle key

(/ page 147)

high voltage power lines

mobile phones

electronic devices (notebooks, tablets)

Manage digital vehicle key (/ page 148)

Remove digital vehicle key (/ page 149)

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Opening and closing -> Key for Your Mercedes C Class 4 Door 2023

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