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

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

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

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

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