Get Opening and closing Guide for Mercedes CLA 4 Door Third Generation (2025-2026)

SmartKey

Overview of SmartKey functions

WARNING Risk of accident and injury due

to children le unattended in the vehicle

If you leave children unattended in the vehicle,

they could, in particular:

open doors, thereby endangering other

persons or road users.

get out and be struck by oncoming trac.

operate vehicle equipment and become

trapped, for example.

In addition, the children could also set the

vehicle in motion by, for example:

releasing the parking brake.

changing the gearbox position.

starting the vehicle.

Never leave children unattended in the

vehicle.

When leaving the vehicle, always take the

key with you and lock the vehicle.

Keep the key out of reach of children.

NOTE Damage to the SmartKey caused by

magnetic elds

Keep the SmartKey away from strong

magnetic elds.

Vehicle key with panic alarm

Locks

Indicator lamp

Unlocks

Opens the trunk lid

Panic alarm

If indicator lamp 2 does not light up when

the Ü or ß button is pressed, the bat-

tery is weak or possibly discharged. Replace

the battery as soon as possible.

Replace the SmartKey battery (/ page 71).

The SmartKey locks and unlocks the following

components:

Doors

Fuel ller ap

Trunk lid

If the vehicle is not opened within approximately

40 seconds aer unlocking, it locks again. Anti-

the protection is armed again.

Do not keep the SmartKey together with elec-

tronic devices or metal objects. This can aect

the SmartKey's functionality.

Opening and closing

Activating/deactivating the acoustic locking veri-

cation signal

Multimedia system:

Settings

Vehicle

Open/Close

Activate or deactivate the Acoustic Lock.

Activating/deactivating the panic alarm

Requirements

The vehicle is switched o.

To activate: press button 1 for approximately

one second.

A visual and audible alarm is triggered.

To deactivate: briey press button 1 again.

Press the start/stop button.

A key belonging to the vehicle must be detec-

ted in the vehicle.

Changing the unlocking settings

Possible unlocking functions of the SmartKey:

Central unlocking

Unlocking the driver's door and fuel ller ap

To switch between settings: press the Ü

and ß buttons simultaneously for approx-

imately six seconds until the indicator lamp

ashes twice.

Options when the unlocking function for the driv-

er's door and fuel ller ap has been selected:

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

ller ap will be unlocked.

Deactivating the function of the key

Vehicles with KEYLESS-GO: if you deactivate the

function of the SmartKey, the KEYLESS-GO func-

tions will also be deactivated. Access or drive

authorization by KEYLESS-GO will then no longer

be possible with that particular SmartKey. Acti-

vate the function of the SmartKey so that all its

functions will again be available.

You can also deactivate the function of the Smart-

Key to reduce the energy consumption of the

SmartKey if you do not use the vehicle or a Smart-

Key for an extended period of time.

Press and hold the ß button on the Smart-

Key.

Opening and closing

With the key button ß pressed, immedi-

ately press key button Ü twice in quick

succession.

The indicator light of the key lights up once

briey and once for a long time.

The following options for re-activating the

SmartKey are available:

Press any button on the SmartKey.

Start the vehicle with the SmartKey in the

marked space in the center console

(/ page 138).

Removing/inserting the mechanical key

Removing the mechanical key

Press release button 1.

Emergency key

2 is pushed out slightly.

Pull out mechanical key 2 until it engages in

the intermediate position.

Press release button 1 again and fully

remove mechanical key

Inserting the mechanical key

Press release button 1.

Insert mechanical key 2 to the intermediate

position or fully until it engages.

You can use the intermediate position of

mechanical key 2 to attach the key to a key

ring.

Replacing the key battery

DANGER Risk of fatal injury due to swal-

lowing batteries

Batteries contain toxic and corrosive substan-

ces. If batteries are swallowed or otherwise

enter the body, severe internal burns can

occur within two hours.

There is a risk of fatal injury!

Keep the batteries out of the reach of

children.

If the lid and/or the battery compart-

ment 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.

Opening and closing

ENVIRONMENTAL NOTE Environmental

damage due to improper disposal of bat-

teries

Batteries contain pollutants. It is illegal

to dispose of them with the household rub-

bish.

Dispose of batteries in an

environmentally responsible manner.

Take discharged batteries to a qualied

specialist workshop or to a collection

point for used batteries.

Requirements

You require a CR 2032 3 V cell battery.

Mercedes-Benz recommends that you have the

battery replaced at a qualied specialist work-

shop.

Remove the mechanical key (/ page 71).

Press release knob 2 down fully and slide

cover

1 in the direction of the arrow.

Fold out cover 1 in the direction of the arrow

and remove.

Remove battery compartment 3 and take

out the discharged battery.

Insert the new battery into battery compart-

ment 3. Observe the positive pole marking in

the battery compartment and on the battery

when doing this.

Push in battery compartment 3.

Re-attach cover 1 and push it until it

engages.

Problems with the key, troubleshooting

You can no longer lock or unlock the vehicle

Possible causes are:

The key battery is weak or discharged.

Check the battery using the indicator lamp

(/ page 69).

Replace the key battery, if necessary

(/ page 71).

Use the replacement key.

Use the mechanical key to lock or unlock

(/ page 76).

Have key checked at a qualied specialist

workshop.

There is interference from a powerful radio signal

source

Possible causes if the function of the key is

impaired:

high voltage power lines

mobile phones

electronic devices (notebooks, tablets)

Opening and closing

shielding due to metal objects or induction

loops for electrical gate systems or automatic

barriers

Make sure that there is sucient distance

between the key and the potential source of

interference.

You have lost a key

Have the key deactivated at a qualied spe-

cialist workshop.

If necessary, have the mechanical lock

replaced as well.

Doors

Unlocking/opening the doors from the inside

To unlock and open a front door: pull door

handle

To unlock a rear door: pull the rear door han-

dle.

To open a rear door: pull the rear door handle

again.

Centrally locking and unlocking the vehicle from

the inside

To unlock: press 1 button.

To lock: press button 2.

The red indicator lamp on button

2 lights up

once the vehicle is locked.

The buttons are also on the front passenger

door.

Opening and closing

This does not lock or unlock the fuel ller ap.

The vehicle is not unlocked:

if you have locked the vehicle using the key

if you have locked the vehicle using KEYLESS-

Locking/unlocking the vehicle with KEYLESS-GO

Requirements

The key is outside the vehicle.

The distance between the key and the vehicle

does not exceed 3  (1 m).

The driver's door and the door on which the

door handle is used are closed.

NOTE Damage to the vehicle caused by

unintentionally opening the trunk lid

When using an automatic car wash

When using a high pressure cleaner

Deactivate the function of the SmartKey

in these situations.

Make sure that the SmartKey is at a min-

imum distance of 10  (3 m) away from

the vehicle.

Observe the notes:

on washing the vehicle in a car wash

(/ page 282)

on using a high-pressure cleaner

(/ page 284)

To unlock the vehicle: touch the inner surface

of the door handle.

To lock the vehicle: touch sensor surface 1

or 2.

Convenience closing: touch recessed sensor

surface 2 until the closing process has been

completed.

Opening and closing

Further information on convenience closing

(/ page 84).

If you open the trunk lid from outside, the trunk

lid is automatically unlocked.

Problems with KEYLESS-GO, troubleshooting

You can no longer lock or unlock the vehicle using

KEYLESS-GO

Possible causes:

The function of the SmartKey has been deacti-

vated.

The SmartKey battery is weak or discharged.

Activate the function of the SmartKey

(/ page 70).

Check the battery using the indicator lamp

(/ page 69).

Replace the SmartKey battery, if necessary

(/ page 71).

Use the replacement SmartKey.

Use the emergency key to lock or unlock

(/ page 76).

Have the vehicle and SmartKey checked at a

qualied specialist workshop.

There is interference from a powerful radio signal

source

Possible causes if the function of KEYLESS-GO is

impaired:

High voltage power lines

Mobile phones

Electronic devices (notebooks, tablets)

Shielding due to metal objects or induction

loops for electrical gate systems or automatic

barriers

Make sure that there is sucient distance

between the SmartKey and the potential

source of interference.

Activating/deactivating the automatic locking fea-

ture

The vehicle is locked automatically when the vehi-

cle is switched on and the wheels are turning

faster than walking pace.

To activate: press and hold button 2 for

approximately ve seconds until an acoustic

signal sounds.

To deactivate: press and hold button 1 for

approximately ve seconds until an acoustic

signal sounds.

The red indicator lamp on button

2 lights up

once the vehicle is locked.

Opening and closing

In the following situations, there is a danger of

being locked out when the function is activated:

while the vehicle is being tow-started or

pushed

if the vehicle is being tested on a roller dyna-

mometer

Activating/deactivating the automatic locking

mechanism

Multimedia system:

Settings

Vehicle

Open/Close

The vehicle is locked automatically when it is

switched on and the wheels are turning faster

than walking pace.

Activate or deactivate Automatic Door Lock.

In the following situations, there is a danger of

being locked out when the function is activated:

The vehicle is being towed or pushed.

If the vehicle is being tested on a roller dyna-

mometer.

Locking/unlocking the vehicle with the mechani-

cal key

Locking/unlocking the driver's door with the

mechanical key

If you wish to lock the vehicle entirely using

the mechanical key, rst press the button for

locking from the inside while the driver's door

is open. Then proceed to lock the driver's

door using the mechanical key.

If you unlock and open the driver's door with

the mechanical key, this triggers the burglar

alarm system.

Remove the mechanical key (/ page 71).

Insert the mechanical key as far as it will go

into opening 1 in the cover.

Pull and hold the door handle.

Pull the cover on the mechanical key as

straight as possible away from the vehicle until

it releases.

Release the door handle.

Opening and closing

To unlock: turn the mechanical key counter-

clockwise to position 1.

To lock: turn the mechanical key clockwise to

position 1.

Carefully press the cover onto the lock cylin-

der until it engages and is seated rmly.

Locking the front passenger door and rear doors

Insert a suitable object, e.g. the mechanical

key, into opening 1 on the door lock.

To lock the le-hand side of the vehicle: turn

the mechanical key counter-clockwise as far

as it will go.

To lock the right-hand side of the vehicle: turn

the mechanical key clockwise as far as it will

go.

If the locked door is then closed, it can no longer

be opened from the outside.

Trunk

Opening the trunk lid

DANGER Risk of exhaust gas poisoning

Combustion engines emit poisonous exhaust

gases such as carbon monoxide. Exhaust

gases can enter the vehicle interior if the trunk

lid is open when the engine is running, espe-

cially if the vehicle is in motion.

Always switch o the engine before

opening the trunk lid.

Never drive with the trunk lid open.

Opening and closing

NOTE Damage to the trunk lid by obsta-

cles above the vehicle

The trunk lid swings upwards when it is

opened.

Therefore, make sure that there is su-

cient clearance above the trunk lid.

Vehicles with HANDS-FREE ACCESS: Make a

kicking movement with your foot below the

bumper (/ page 79).

Pull remote operating switch 1 until the

trunk lid opens.

Press and hold the p button on the Smart-

Key.

With the trunk lid unlocked, press the top of

the Mercedes star 2.

To open, pull on the folded-out Mercedes star

when the reversing camera is activated.

Closing the trunk lid

WARNING Risk of injury from unsecured

items in the vehicle

If objects, luggage or loads are not secured or

not secured suciently, they could slip, tip

over or be thrown around and thereby hit vehi-

cle occupants.

Opening and closing

There is a risk of injury, particularly in the

event of sudden braking or a sudden change

in direction.

Always stow objects in such a way that

they cannot be thrown around.

Before the journey, secure objects, lug-

gage or loads against slipping or tipping

over.

Observe the notes on loading the vehicle.

Notes on closing the trunk lid: your vehicle is

equipped with automatic SmartKey recognition. If

a SmartKey belonging to the vehicle is detected in

the vehicle, the trunk lid will not be locked and will

pop open again.

Note that the trunk lid will not be locked if the fol-

lowing situation occurs:

You have locked the vehicle and close the

trunk lid while a SmartKey belonging to the

vehicle is inside the vehicle.

and

A second SmartKey belonging to the vehicle is

not detected outside the vehicle.

Automatic SmartKey recognition is only an aid

and is not a substitute for your attentiveness.

Before locking, ensure that at least one

SmartKey belonging to the vehicle is outside

the vehicle.

To close the trunk lid: pull the trunk lid down-

wards using the handle recess and push it

closed.

HANDS-FREE ACCESS function

With HANDS-FREE ACCESS, you can open the

trunk lid by performing a kicking movement under

the bumper. The transmission must be in position

j for this.

Observe the notes when opening the trunk lid

(/ page 77).

Opening and closing

WARNING Risk of burns caused by a hot

exhaust system

The vehicle exhaust system can become very

hot. If you use HANDS-FREE ACCESS, you

could burn yourself by touching the exhaust

system.

Always ensure that you only make a kick-

ing movement within the detection range

of the sensors.

NOTE Damage to the vehicle caused by

unintentionally opening the trunk lid

When using an automatic car wash

When using a high pressure cleaner

Deactivate the function of the SmartKey

in these situations.

Make sure that the SmartKey is at a min-

imum distance of 10  (3 m) away from

the vehicle.

When making the kicking movement, make sure

that your footing is rm. You could otherwise lose

your balance, e.g. on ice.

Observe the following notes:

The SmartKey is behind the vehicle.

If the SmartKey is not recognized:

Hold the SmartKey in your hand.

Ensure that the SmartKey function is acti-

vated (/ page 70).

Stand at least 12 in (30 cm) away from the

vehicle while performing the kicking move-

ment.

Do not touch the bumper while making the

kicking movement.

Do not carry out the kicking movement too

slowly.

The kicking movement must be towards the

vehicle and back again.

Detection range of the sensors

If several consecutive kicking movements are not

successful, wait ten seconds.

System limits

The system may be impaired or may not function

in the following cases:

The sensors are dirty, e.g. due to road salt or

snow.

The kicking movement is made using a pros-

thetic leg.

Opening and closing

The trunk lid could be opened unintentionally in

the following situations:

A person's arms or legs are moving in the sen-

sor detection range, e.g. when polishing the

vehicle or picking up objects.

Objects are moved or placed behind the vehi-

cle, e.g. the hose of a fuel dispenser, a charg-

ing cable or luggage

Clamping straps, tarp or other coverings are

pulled over the bumper.

A protective mat with a length reaching over

the loading sill down into the detection range

of the sensors is used.

The protective mat is not secured correctly.

Deactivate the function of the SmartKey

(/ page 70) or do not carry the SmartKey about

your person in such situations.

Unlocking and opening the trunk from inside with

the emergency release

Requirements

The 12 V vehicle battery is connected and

charged.

Press emergency release button 1 briey.

Activating/deactivating the trunk lid opening

height restriction

Multimedia system:

Settings

Vehicle

Other Functions

Switch Opening Height Limiter on or o.

This function prevents the trunk lid from hitting a

low garage ceiling, for example.

Side windows

Opening and closing the side windows

WARNING Risk of entrapment when open-

ing a side window

When opening a side window, parts of the

body could be drawn in or become trapped

between the side window and window frame.

When opening, make sure that nobody is

touching the side window.

Opening and closing

If someone is trapped, release the but-

ton immediately or pull it in order to

close the side window again.

WARNING Risk of becoming trapped when

closing a side window

When closing a side window, body parts could

be trapped in the closing area in the process.

When closing, make sure that no body

parts are in the closing area.

If someone is trapped, release the but-

ton immediately or press the button in

order to reopen the side window.

WARNING Risk of becoming trapped when

children operate the side windows

Children could become trapped if they operate

the side windows, particularly when unatten-

ded.

Activate the child safety lock for the rear

passenger compartment side windows.

When leaving the vehicle, always take the

SmartKey with you and lock the vehicle.

Never leave children unattended in the

vehicle.

Requirements:

The power supply or the vehicle has been

switched on.

Closing

Opening

The buttons on the driver's door take precedence.

To start automatic operation: press the W

button beyond the pressure point or pull and

release it.

To interrupt automatic operation: press or pull

the W button again.

Opening and closing

When the vehicle is switched o, you can con-

tinue to operate the side windows.

This function is available for around four minutes

or until a front door is opened.

Automatic reversing function of the side windows

If an obstacle impedes a side window during the

closing process, the side window will open again

automatically. The automatic reversing function is

only an aid and is not a substitute for your atten-

tiveness.

During the closing process, make sure that no

body parts are in the closing area.

WARNING Risk of becoming trapped

despite there being reversing protection

on the side window

The reversing function does not react:

To so, light and thin objects, e.g. ngers.

During resetting.

The reversing function cannot prevent some-

one from becoming trapped in these situa-

tions.

During the closing process, make sure

that no body parts are in the closing

area.

If someone becomes trapped, press the

W button to open the side window

again.

Convenience opening (ventilating the vehicle

before starting a journey)

WARNING Risk of entrapment when open-

ing a side window

When opening a side window, parts of the

body could be drawn in or become trapped

between the side window and window frame.

When opening, make sure that nobody is

touching the side window.

Release the button immediately if some-

body becomes trapped.

Requirements

The SmartKey is in the immediate vicinity of

the vehicle.

Press and hold the Ü button on the Smart-

Key.

The following functions will be performed:

The vehicle will be unlocked.

The side windows will be opened.

The panoramic sliding sunroof will be

opened.

The driver's seat ventilation will be

switched on

If the roller sunblind of the panoramic sliding

sunroof is closed, the roller sunblind will be

opened rst.

To interrupt convenience opening: release the

Ü button.

To continue convenience opening: press and

hold the Ü button again.

Opening and closing

Convenience closing (closing the vehicle from out-

side)

WARNING Risk of entrapment due to not

paying attention during convenience clos-

ing

When the convenience closing feature is oper-

ating, parts of the body could become trapped

in the closing area of the side window and the

sliding sunroof.

When the convenience closing feature is

operating, monitor the entire closing

process and make sure that no body

parts are in the closing area.

Requirements

The SmartKey is in the immediate vicinity of

the vehicle.

Press and hold the ß button on the Smart-

Key.

The following functions will be performed:

The vehicle will be locked.

The side windows will be closed.

The panoramic sliding sunroof will be

closed.

To interrupt convenience closing: release the

ß button.

To continue convenience closing: press and

hold the ß button again.

Convenience closing also functions with KEY-

LESS-GO (/ page 74).

Resolving problems with the side windows

WARNING Risk of becoming trapped or

fatally injured if reversing protection is not

activated

If you close a side window again immediately

aer it has been blocked, the side window will

close with increased or maximum force. The

reversing function is then not active and body

parts may become trapped.

Make sure that no parts of the body are

in the closing area.

To stop the closing process, release the

button or press the button again to

reopen the side window.

A side window cannot be closed and you cannot

see the cause.

Check to see whether any objects are in the

window guide.

Adjust the side windows.

Adjusting the side windows

If a side window is obstructed during closing and

reopens again immediately:

Immediately aer this, pull and hold the corre-

sponding button again until the side window

has closed and hold the button for at least one

more second (re-adjustment).

The side window will be closed without the

automatic reversing function.

If the side window is obstructed again and

reopens again immediately:

Immediately aer this, pull and hold the corre-

sponding button again until the side window

Opening and closing

has closed and hold the button for at least one

more second (follow-up adjustment).

The side window will be closed without the

automatic reversing function.

The side windows cannot be opened or closed

using the convenience opening feature.

Possible causes are:

The key battery is weak or discharged.

Check the battery using the indicator lamp

(/ page 69).

Replace the key battery, if necessary

(/ page 71).

Sliding sunroof

Opening and closing the sliding sunroof

The term "sliding sunroof" also refers to the

panorama roof with power tilt/sliding panel.

WARNING Risk of becoming trapped when

the sliding sunroof is being opened and

closed

Body parts may become trapped in the range

of movement.

During opening and closing, make sure

that no body parts are in the range of

movement.

Release the button immediately if some-

body becomes trapped.

Briey press the button in any direction

during automatic operation.

The opening or closing process will be

stopped.

WARNING Risk of becoming trapped if the

sliding sunroof is operated by children

Children operating the sliding sunroof could

get caught in the moving parts, particularly if

unattended.

Never leave children unattended in the

vehicle.

When leaving the vehicle, always take the

key with you and lock the vehicle.

WARNING Risk of becoming trapped when

the roller sunblind is being opened and

closed

Body parts may become trapped between the

roller sunblind and frame or sliding roof.

When opening or closing, make sure that

no body parts are in the roller sunblind's

range of movement.

Release the button immediately if some-

body becomes trapped.

Briey press the button in any direction

during automatic operation.

The opening or closing process will be

stopped.

Opening and closing

NOTE Malfunction due to snow and ice

Snow and ice may cause the sliding sunroof to

malfunction.

Open the sliding sunroof only if it is free

of snow and ice.

NOTE Damage caused by protruding

objects

Objects that protrude from the sliding sunroof

may damage the seals.

Do not allow anything to protrude from

the sliding sunroof.

NOTE Damage to the panorama roof with

power tilt/sliding panel due to non-

approved roof luggage racks

The panorama roof with power tilt/sliding

panel may be damaged by the roof luggage

rack if you attempt to open it when using a

roof luggage rack not tested and approved for

Mercedes-Benz.

When a roof luggage rack is installed,

open the panorama roof with power tilt/

sliding panel only if this has been tested

and approved for Mercedes-Benz.

The panorama roof with power tilt/sliding

panel may be raised to allow ventilation of the

vehicle interior.

Raise

Open

Close/lower

Use the 3 button to operate the panorama

roof with power tilt/sliding panel and the roller

sunblind.

Opening and closing

The panorama roof with power tilt/sliding panel

can be operated only when the roller sunblind is

open.

Check whether the sliding sunroof can be

raised or opened when a roof luggage rack is

installed.

To start automatic operation: press the 3

button beyond the point of resistance or pull

and release it.

To interrupt automatic operation: briey press

the 3 button in any direction.

The opening/closing process will be stopped.

Vehicles with a panorama roof with power tilt/

sliding panel: the automatic raising feature is

available only when the sliding sunroof is closed

or raised.

Automatic reversing function of the sliding sun-

roof

If an obstacle obstructs the sliding sunroof during

the closing process, the sliding sunroof will open

again automatically. The automatic reversing func-

tion is only an aid and is not a substitute for your

attentiveness.

During the closing process, make sure that no

body parts are in the closing area.

WARNING Risk of becoming trapped

despite the reversing function being active

In particular, the reversing function does not

react:

To so, light and thin objects, e.g. ngers.

Towards the end of the closing procedure.

During resetting.

During the closing process, make sure

that no body parts are in the closing

area.

Release the button immediately if some-

body becomes trapped.

Briey press the button in any direction

during automatic operation.

The closing process will be stopped.

Automatic reversing function of the roller sunblind

If an obstacle obstructs the roller sunblind during

the closing process, the roller sunblind will open

again automatically. The automatic reversing func-

tion is only an aid and is not a substitute for your

attentiveness.

When closing the roller sunblind, make sure

that no body parts are in the area of move-

ment.

WARNING Risk of becoming trapped

despite reversing function

In particular, the reversing function does not

react to so, light and thin objects, e.g. n-

gers.

When closing the roller sunblind, make

sure that no body parts are in the range

of movement.

Release the button immediately if some-

body becomes trapped.

Briey press the button in any direction

during the automatic closing process.

The closing process will be stopped.

Opening and closing

Automatic functions of the sliding sunroof

The term "sliding sunroof" also refers to the

panoramic sliding sunroof.

Rain closing function when driving

Vehicles with a panoramic sliding sunroof: if it

starts to rain, the raised sliding sunroof will auto-

matically be lowered while the vehicle is in

motion.

Automatic lowering function

Vehicles with a panoramic sliding sunroof: if the

sliding sunroof is raised at the rear, it will auto-

matically be lowered slightly at higher speeds. At

low speeds, it will be raised again automatically.

WARNING Risk of becoming trapped by

automatic lowering of the sliding sunroof

At higher speeds, the raised sliding sunroof

will automatically be lowered slightly at the

rear.

Make sure that nobody reaches into the

sliding sunroof's range of movement

while the vehicle is in motion.

If somebody becomes trapped, briey

push the sliding sunroof button forwards

or backwards.

By pushing or pulling the 3 button, you

can interrupt the automatic functions "Rain

closing function when driving" and "Automatic

lowering".

Rectifying problems with the sliding sunroof

WARNING Risk of becoming trapped or

fatal injuries when the sliding sunroof is

closed again

If the sliding sunroof is closed again immedi-

ately aer it has been blocked or reset, it will

close with increased force.

Make sure that no parts of the body are

in the closing area.

Release the button immediately if some-

body becomes trapped.

Briey press the button in any direction

during the automatic closing process.

The closing process will be stopped.

The sliding sunroof cannot be closed and you can-

not see the cause.

The term "sliding sunroof" also refers to the

panorama roof with power tilt/sliding panel.

If the sliding sunroof is obstructed during closing

and reopens again slightly:

Immediately aer automatic reversing, pull

and hold the 3 button down again to the

point of resistance until the sliding sunroof is

closed.

The sliding sunroof will be closed with

increased force.

If the sliding sunroof is obstructed again and

opens again slightly:

Repeat the previous step.

The sliding sunroof will be closed again with

increased force.

Opening and closing

Vehicles with a panorama roof with power tilt/

sliding panel: The sliding sunroof or the roller sun-

blind is not operating smoothly.

Reset the sliding sunroof and the roller sun-

blind.

Resetting the sliding sunroof and the roller sun-

blind

Pull and hold the 3 button little by little

until the sliding sunroof is fully closed.

Pull and hold the 3 button little by little

until the roller sunblind is fully closed.

Use automatic operation to fully open and

then close the sliding sunroof.

Anti-the protection

Function of the immobilizer

The immobilizer prevents your vehicle from being

started without the correct key.

The immobilizer is automatically activated when

the vehicle is switched o, and deactivated when

the vehicle is switched on.

When leaving the vehicle, always take the key with

you and lock the vehicle. Anyone can start the

vehicle if a valid key has been le inside the vehi-

cle.

In the event the engine cannot be started (yet

the vehicle’s battery is charged), the system is

not operational. Contact an authorized

Mercedes-Benz Center or call

1-800-FOR-MERCedes (in the USA) or

1-800-387-0100 (in Canada).

ATA (anti-the alarm system)

▌Function of the ATA system

If the ATA system is armed, a visual and audible

alarm is triggered in the following situations:

When a door is opened

When the trunk lid is opened

When the hood is opened

When interior protection is triggered

(/ page 90)

When the tow-away alarm is triggered

(/ page 90)

The ATA system is armed automatically aer

approximately ten seconds in the following situa-

tions:

Aer you lock the vehicle with the key

Aer you lock the vehicle using KEYLESS-GO

Indicator lamp 1 ashes when the ATA system is

armed.

Opening and closing

The ATA system is deactivated automatically in the

following situations:

Aer you unlock the vehicle with the key

Aer you unlock the vehicle using KEYLESS-

Aer you press the start/stop button with the

key in the marked space (/ page 138)

If the battery is heavily discharged, the anti-

the alarm system is automatically deactiva-

ted in favor of the next engine start.

▌Deactivating the ATA

Press the Ü, ß or p button on the

key.

Press the start/stop button with the key in the

stowage compartment (/ page 138)

Deactivating the alarm using KEYLESS-GO

Grasp the outside door handle with the key

outside the vehicle.

Function of the tow-away alarm

This function may not be available in all coun-

tries.

An audible and visual alarm is triggered if an alter-

ation to your vehicle's angle of inclination is

detected while the tow-away alarm is armed.

The tow-away alarm is automatically armed aer

about 60 seconds:

aer you lock the vehicle with the key

aer you lock the vehicle using KEYLESS-GO

The tow-away alarm is armed only when the fol-

lowing components are closed:

Doors

Trunk lid

The tow-away alarm is automatically deactivated:

aer you press the Ü or p button on

the key

aer you press the start/stop button with the

key in the marked space (/ page 138)

aer you unlock the vehicle using KEYLESS-

when you are using HANDS-FREE ACCESS

Information on collision detection when the vehi-

cle is parked (/ page 165).

Arming/deactivating tow-away alarm

Multimedia system:

Settings

Vehicle

Opening/closing

Vehicle Protection

Arm or deactivate Tow-away Protection.

Tow-away alarm is armed again in the following

cases:

The vehicle is unlocked again.

A door is opened.

The vehicle is locked again.

Function of interior protection

This function may not be available in all coun-

tries.

Opening and closing

When interior protection is armed, a visual and

audible alarm is triggered if movement is detected

in the vehicle interior.

Interior protection is armed automatically aer

approximately ten seconds:

aer locking the vehicle with the key

aer locking the vehicle using KEYLESS-GO

Interior protection is armed only when the follow-

ing components are closed:

Doors

Trunk lid

Interior protection is automatically deactivated:

aer pressing the Ü or p button on the

key

aer pressing the start/stop button with the

key in the stowage compartment

(/ page 138)

aer unlocking the vehicle using KEYLESS-GO

when using HANDS-FREE ACCESS

The following situations can lead to a false alarm:

when there are moving objects suchas mas-

cots in the vehicle interior

if a side window is open

if the panorama roof with power tilt/sliding

panel is open

Arming/deactivating interior protection

Multimedia system:

Settings

Vehicle

Opening/closing

Vehicle Protection

Arm or deactivate Interior Motion Sensor.

Interior protection is armed again in the following

cases:

The vehicle is unlocked again.

A door is opened.

The vehicle is locked again.

Opening and closing

Opening and closing for Your Mercedes CLA 4 Door Third Generation (2025-2026)

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