Get Opening and closing -> Key Guide for Mercedes A Class 4 Door Third Generation (2012-2017)

Key

82

Useful information

Do notattachanyheavy or largeobjects to the

key. Remove any bulky keyrings before insert-

ing the key into the ignition lock.

i This Owner's Manual describes all mod-

els, series and optional equipment for your

vehicle that were available at the time of

going to press. National variations are pos-

sible. Note that your vehicle may not be

equipped with all of the functions descri-

bed. This is also the case for systems and

functions relevant to safety.

! Keep the key away from strong magnetic

fields. Otherwise, the remote control func-

tion could be affected.

Strong magnetic fields can occur in the

vicinity of powerful electrical installations.

Do not keep the key:

i Read the information on qualified special-

ist workshops: (Y page 24).

R

with electronic devices, e.g. a mobile

phone or another key

R

with metallic objects, e.g. coins or metal

film

Key

R

inside metallic objects, e.g. a metal case

Important safety notes

Vehicles with KEYLESS-GO start function:

do not keep the key in the luggage compart-

ment. Otherwise, the key may not be detec-

ted, e.g. when starting the engine using the

Start/Stop button.

WARNING

G

If children are left unsupervised in the vehicle,

they could:

R

open doors, thereby endangering other per-

United Kingdom only:

sons or road users

WARNING

G

R

get out and be struck by oncoming traffic

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.

R

operate vehicle equipment and become

trapped, for example

In addition, the children could also set the

vehicle in motion, for example, if they:

R

release the parking brake

Therefore, do not leave any people unsuper-

vised in the vehicle, particularly children, eld-

erly people or people in need of special assis-

tance. Do not activate the double lock when

people are in the vehicle.

R

shift the automatic transmission out of park

position P or shift manual transmission into

neutral

R

start the engine

There is a risk of an accident and injury.

If the vehicle has been locked from the out-

side, the double lock function is activated as

standard. It is then not possible to open the

doors from inside the vehicle. You can deac-

tivate the double lock function by deactivat-

ing the interior motion sensor (Y page 80).

The doors can then be opened from the inside

after the vehicle has been locked from the

outside. You can open the rear doors from

inside the vehicle if they are not secured by

the child-proof locks (Y page 68). The anti-

theft alarm system is triggered if the door is

When leaving the vehicle, always take the key

with you and lock the vehicle. Never leave

children and animals unattended in the vehi-

cle. Keep the keys out of the reach of children.

WARNING

G

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.

Key

83

opened from the inside. Switch off the alarm You can also set an audible signal to confirm

(Y page 78).

that the vehicle has been locked. The audible

signal can be activated or deactivated using

the on-board computer (Y page 252).

WARNING

G

If persons (particularly children) are exposed

to heat or cold for a prolonged period, there is

a risk of serious or even fatal injuries. Never

leave persons (particularly children) unatten-

ded in the vehicle.

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.

Key functions

Locking and unlocking

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 KEY-

LESS-GO functions with the functions of a

conventional key. Unlock the vehicle by using

KEYLESS-GO, for instance, and lock it using

the & button on the key.

The driver's door and the door at 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.

:

& Locks the vehicle

% Unlocks the vehicle

;

X

To unlock centrally: press the % but-

ton.

If you do not open the vehicle within

approximately 40 seconds of unlocking:

A check which periodically establishes a radio

connection between the vehicle and the key

determines whether a valid key is in the vehi-

cle. This occurs, for example:

R

the vehicle locks again

protection against theft is reactivated

R

when starting the engine

whilst driving

when the external door handles are

touched

X

To lock: press the & button.

R

The key centrally locks/unlocks:

R

the doors

the tailgate

the fuel filler flap

R

during convenience closing

R

When unlocking, the turn signals flash once.

When locking, they flash three times.

When the locator lighting is activated in Audio

20/COMAND Online, it lights up when it is

dark after the vehicle is unlocked with the

remote control (see separate operating

instructions).

Z

Key

84

X

To deactivate: press the & button on

the key twice in rapid succession.

The battery check lamp of the key flashes

twice briefly and lights up once, then KEY-

LESS-GO is deactivated (Y page 86).

To activate: press any button on the key.

or

X

Insert the key into the ignition lock.

KEYLESS-GO and all of its associated fea-

tures are available again.

X

To unlock the vehicle: touch the inner

surface of the door handle.

To lock the vehicle: touch sensor sur-

face : or ;.

KEYLESS-GO start function

General notes

Make sure that you do not touch the inner

surface of the door handle.

Convenience closing feature: touch

recessed sensor surface ; for an exten-

ded period.

Bear in mind that the engine can be started by

any of the vehicle occupants if there is a key

in the vehicle.

X

For further information on the convenience

closing feature (Y page 95).

Changing the settings of the locking

system

You can change the settings of the locking

system. This means that only the driver's door

and the fuel filler flap are unlocked when the

vehicle is unlocked. This is useful if you fre-

quently travel alone.

X

To change the setting: press and hold

down the % and & buttons simulta-

neously for about six seconds until the bat-

tery indicator lamp flashes twice

(Y page 86).

If the setting of the locking system is changed

within the signal range of the vehicle, press-

ing the & or % button:

X

To unlock the tailgate: pull tailgate han-

dle :.

R

locks or

unlocks the vehicle

Deactivating and activating

R

If you do not intend to use the vehicle for an

extended period of time, you can deactivate

KEYLESS-GO. The key will then use very little

power, thereby conserving battery power. For

the purposes of activation or deactivation,

the vehicle does not have to be nearby.

The key now functions as follows:

X

To unlock: press the % button once.

To unlock centrally: press the % but-

ton twice.

X

To lock centrally: press the & button.

Key

85

X

The KEYLESS-GO function is changed as fol-

lows:

To unlock the fuel filler flap: insert the

key into the ignition lock.

X

To unlock the driver's door: touch the

Removing the emergency key element

inner surface of the door handle on the

driver's door.

X

To unlock centrally: touch the inner sur-

face of the door handle on the front-

passenger door or the rear door.

X

To lock centrally: touch the outer sensor

surface on one of the door handles.

X

To restore the factory settings: press

and hold down the % and & buttons

simultaneously for approximately six sec-

onds until the battery check lamp flashes

twice (Y page 86).

X

Push release catch : in the direction of

the arrow and, at the same time, remove

emergency key element ; from the key.

Further information about:

Emergency key element

General notes

R

unlocking the driver's door (Y page 91)

R

unlocking the luggage compartment

(Y page 93)

locking the vehicle (Y page 92)

If the vehicle can no longer be unlocked with

the key or KEYLESS-GO, use the emergency

key element.

R

If you use the emergency key element to

unlock and open the driver's door or the tail-

gate, the anti-theft alarm system will be trig-

gered (Y page 78).

Inserting the emergency key element

X

Push emergency key element ; com-

pletely into the key until it engages and

release catch : is back in its basic posi-

tion.

There are several ways to deactivate the

alarm:

^XTo deactivate the alarm with the key:

press the % or & button on the key.

Battery of the key

or

X

Insert the key into the ignition lock.

Important safety notes

or

WARNING

G

^XTo deactivate the alarm with KEYLESS-

GO: press the Start/Stop button in the igni-

tion lock. The key must be in the vehicle.

or

X

Batteries contain toxic and corrosive substan-

ces. If batteries are swallowed, it can result in

severe health problems. There is a risk of fatal

injury.

Keep batteries out of the reach of children. If

a battery is swallowed, seek medical attention

immediately.

Lock or unlock the vehicle using KEYLESS-

GO. The key must be outside the vehicle.

If you unlock the vehicle using the emergency

key element, the fuel filler flap will not be

unlocked automatically.

Z

Key

86

Replacing the battery

Environmental note

H

Batteries contain pollutants.

You require a CR 2025 3 V cell battery.

It is illegal to dispose of them

with the household rubbish.

They must be collected sep-

arately and disposed of in an

environmentally responsible

recycling system.

X

Take the emergency key element out of the

key (Y page 85).

Dispose of batteries in an

environmentally responsible

manner. Take discharged

batteries to a qualified spe-

cialist workshop or to a col-

lection point for used batter-

ies.

X

Press emergency key element ; into the

Mercedes-Benz recommends that you have

the battery replaced at a qualified specialist

workshop.

opening in the key in the direction of the

arrow until battery tray cover : opens.

When doing so, do not hold cover : shut.

X

Remove battery tray cover :.

Checking the battery

X

Repeatedly tap the key against your palm

until battery = falls out.

X

Press the & or % button.

The battery is working properly if battery

check lamp : lights up briefly.

X

Insert the new battery with the positive ter-

minal facing upwards. Use a lint-free cloth

to do so.

The battery is discharged if battery check

lamp : does not light up briefly.

X

Make sure that the surface of the battery is

free of lint, grease and other contamina-

tion.

Insertthe front tabs of batterytray cover :

and then press to close it.

X

Replace the battery (Y page 86).

i If the key battery is checked within the

signal reception range of the vehicle, press-

ing the & or % button:

X

R

locks or

X

Insert emergency key element into the key

(Y page 85).

R

unlocks the vehicle

i You can obtain a battery from any quali-

fied specialist workshop.

X

Check the function of all key buttons on the

vehicle.

Key

87

Problems with the key

Problem

Possible causes/consequences and M Solutions

You cannot lock or

unlock the vehicle

using the key.

The key battery is discharged or nearly discharged.

^XVehicles without KEYLESS-GO or KEYLESS-GO start func-

tion: try again to lock/unlock the vehicle using the remote con-

trol function of the key. Point the tip of the key at the driver's

door handle from close range and press the % or & but-

ton.

If this does not work:

X

Check the key battery (Y page 86) and replace it if necessary

(Y page 86).

X

Lock (Y page 91) or unlock (Y page 92) the vehicle using the

emergency key element.

There is interference from a powerful source of radio waves.

^XVehicles without KEYLESS-GO or KEYLESS-GO start func-

tion: try again to lock/unlock the vehicle using the remote con-

trol function of the key. Point the tip of the key at the driver's

door handle from close range and press the % or & but-

ton.

If this does not work:

X

Lock (Y page 91) or unlock (Y page 92) the vehicle using the

emergency key element.

The key is faulty.

X

Lock (Y page 91) or unlock (Y page 92) the vehicle using the

emergency key element.

X

Have the key checked at a qualified specialist workshop.

You can no longer lock The key battery is discharged or nearly discharged.

or unlock the vehicle

X

Check the key battery (Y page 86) and replace it if necessary

using KEYLESS-GO.

(Y page 86).

If this does not work:

X

Lock (Y page 91) or unlock (Y page 92) the vehicle using the

emergency key element.

There is interference from a powerful source of radio waves.

X

Lock (Y page 91) or unlock (Y page 92) the vehicle using the

emergency key element.

Z

Key

88

Problem

Possible causes/consequences and M Solutions

There is a fault with KEYLESS-GO.

X

Lock/unlock the vehicle using the remote control function of

the key.

X

Have the vehicle and key checked at a qualified specialist work-

shop.

If the vehicle can also not be locked/unlocked using the remote

control function:

X

Lock (Y page 91) or unlock (Y page 92) the vehicle using the

emergency key element.

X

Have the vehicle and key checked at a qualified specialist work-

shop.

The engine cannot be

started using the key.

the on-board voltage is too low

X

Switch off non-essential consumers, e.g. seat heating or interior

lighting, and try to start the engine again.

If this does not work:

X

Check the starter battery and charge it if necessary

(Y page 347).

or

X

Jump-start the vehicle (Y page 348).

or

X

Consult a qualified specialist workshop.

The engine cannot be

startedusingtheStart/

Stop button. The key is

in the vehicle.

The vehicle is locked.

X

Unlock the vehicle and try to start the vehicle again.

The key battery is discharged or nearly discharged.

X

Check the key battery (Y page 86) and replace it if necessary

(Y page 86).

If this does not work:

X

Start your vehicle with the key in the ignition lock.

There is interference from a powerful source of radio waves.

X

Start your vehicle with the key in the ignition lock.

Doors

89

Problem

Possible causes/consequences and M Solutions

X

You have lost a key.

Have the key deactivated at a qualified specialist workshop.

Report the loss immediately to the vehicle insurers.

If necessary, have the locks changed as well.

X

You have lost the emer-

gency key element.

Report the loss immediately to the vehicle insurers.

If necessary, have the locks changed as well.

Doors

Therefore, do not leave any people unsuper-

vised in the vehicle, particularly children, eld-

erly people or people in need of special assis-

tance. Do not activate the double lock when

people are in the vehicle.

Important safety notes

WARNING

G

If children are left unsupervised in the vehicle,

they could:

If the vehicle has been locked with the key,

the double lock function is activated as stand-

ard. 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 (Y page 80). The doors

can then be opened from the inside after the

vehicle has been locked from the outside. You

can open the rear doors from inside the vehi-

cle if they are not secured by the child-proof

locks (Y page 68). The anti-theft alarm system

is triggered if the door is opened from the

inside. Switch off the alarm (Y page 78).

R

open doors, thereby endangering other per-

sons or road users

get out and be struck by oncoming traffic

operate vehicle equipment and become

R

trapped, for example

In addition, the children could also set the

vehicle in motion, for example, if they:

R

release the parking brake

shift the automatic transmission out of park

position P or shift manual transmission into

neutral

R

start the engine

There is a risk of an accident and injury.

Unlocking and opening the doors

from the inside

When leaving the vehicle, always take the key

with you and lock the vehicle. Never leave

children and animals unattended in the vehi-

cle. Keep the keys out of the reach of children.

Stow luggage or loads preferably in the lug-

gage compartment. Observe the loading

guidelines (Y page 306).

United Kingdom only:

WARNING

G

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.

X

Pull door handle ;.

If the door is locked, locking knob : pops

up. The door is unlocked and opens.

Z

Opening and closing -> Key for Your Mercedes A Class 4 Door Third Generation (2012-2017)

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