2016 MERCEDES-BENZ CLA key

Useful information
i This Operator's Manual describes all
models and all standard and optional equip-
ment of your vehicle available at the time of
publication of the Operator's Manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions.
i Read the information on qualified special-
ist workshops ( Y
page 25).
SmartKey
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
G WARNING
If you attach heavy or large objects to the
SmartKey, the SmartKey could be uninten-
tionally 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
SmartKey. Remove any bulky key rings before
inserting the SmartKey into the ignition lock.
! Keep the SmartKey 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 keep the SmartKey: R
with electronic devices, e.g. a mobile
phone or another SmartKey. R
with metallic objects, e.g. coins or metal
foil. R
inside metallic objects, e.g. a metal case.
Vehicles with KEYLESS-GO start function:
do not keep the SmartKey in the cargo com-
partment. Otherwise, the SmartKey may not
be detected, e.g. when starting the engine
using the Start/Stop button.
SmartKey functions
C
7 To lock the vehicleD
T To open the trunk lid

The SmartKey centrally locks/unlocks: R
the doors R
the trunk lid R
the fuel filler flap
The turn signals flash once when unlocking
and three times when locking.
When the locator lighting is activated in Audio
20/COMAND, it lights up when it is dark after
the vehicle is unlocked with the remote con-
trol (see separate operating instructions).
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer ( Y
page 222).X
To open the trunk lid automatically:
press and hold the T button until the
trunk lid opens ( Y
page 86).
KEYLESS-GO
General notes
Bear in mind that the engine can be started by
any of the vehicle occupants if there is a
SmartKey in the vehicle.
Locking and unlocking
You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you only need carry
the SmartKey with you. You can combine the
functions of KEYLESS-GO with those of a con-
ventional SmartKey. Unlock the vehicle by
using KEYLESS-GO, for instance, and lock it
using the 7 button on the SmartKey.
The driver's door and the door at which the
handle is used, must both be closed. The
SmartKey must be outside the vehicle. When
locking or unlocking with KEYLESS-GO, the
distance between the SmartKey and the cor-
responding door handle must not be greater
than 3 ft (1 m). A check which periodically establishes a radio
connection between the vehicle and the
SmartKey determines whether a valid Smart-
Key is in the vehicle. This occurs, for example: R
when starting the engine R
whilst driving R
when the external door handles are
touched R
during convenience closing
X
To unlock the vehicle: touch the inner
surface of the door handle. X
To lock the vehicle: touch sensor sur-
face C or D .
Make sure that you do not touch the inner
surface of the door handle. X
Convenience closing feature: touch
recessed sensor surface D for an exten-
ded period.
Further information on the convenience
closing feature ( Y
page 90).
X
To unlock the trunk lid: pull trunk lid han-
dle C . SmartKey 77
Opening and closing Z

Deactivating an d activatingIf you do no t intend to use th e vehicle fo r a
longer period of time, you can deactivat e KEY-
LESS-GO . The SmartKey will then use ver y lit -
tl e power, thereby conservin g battery power.
Fo r th e purposes of activation/deactivation ,
th e vehicle mus t no t be nearby.X
To deactivate : press th e 7 butto n on
th e SmartKey twic e in rapid succession .
The battery chec k lamp of th e SmartKey
flashes twic e briefly and lights up once ,
then KEYLESS-GO is deactivated
( Y
page 79) .X
To activate : press any butto n on th e
SmartKey.
or X
Inser t th e SmartKey into th e ignition lock.
KEYLESS-GO and all of it s associated fea-
tures are available again .
KEYLESS-G O star t function
General notes
Bear in min d that th e engin e can be started by
any of th e vehicle occupant s if there is a
SmartKey in th e vehicle.
Changin g th e settings of th e locking
syste m
You can chang e th e setting s of th e locking
system. Thi s means that only th e driver's doo r
and th e fue l filler flap are unlocke d when th e
vehicle is unlocked. Thi s is useful if you fre-
quentl y trave l on your own .X
To change th e setting: press and hol d th e
6 and 7 buttons simultaneousl y fo r approximately six seconds until th e battery
indicator lamp flashes twic e ( Y
page 79) .
If th e setting of th e locking system is changed
within th e signal range of th e vehicle, press-
in g th e 7 or 6 button: R
locks or R
unlocks th e vehicle
The SmartKey no w function s as follows :X
To unlock : press th e 6 butto n once .X
To unlock centrally : press th e 6 but -
to n twice. X
To lock centrally : press th e 7 button.
The KEYLESS-GO function is changed as fol-
lows : X
To unlock th e driver's door: touch th e
inne r surfac e of th e doo r handle on th e
driver's door. X
To unlock centrally : touch th e inne r sur -
fac e of th e doo r handle on th e front-
passenger doo r or th e rea r door.X
To lock centrally : touch th e outer sensor
surfac e on on e of th e doo r handles .X
To restor e th e factory settings: press
and hol d th e 6 and 7 buttons simul-
taneousl y fo r approximately six seconds
until th e battery chec k lamp flashes twic e
( Y
page 79).
Mechanica l key
General notes
If th e vehicle can no longer be locke d or
unlocke d wit h th e SmartKey or KEYLESS-GO ,
use th e mechanical key.
If you use th e mechanical ke y to unloc k and
ope n th e driver's doo r or th e trunk lid, th e
anti-thef t alar m system will be triggere d
( Y
page 73).
There are severa l ways to turn of f th e alarm:X
To deactivate th e alarm wit h th e key :
press th e 6 or 7 butto n on th e key.
or78
SmartKey
Opening and closing

X
Insert the SmartKey into the ignition lock.
or X
To deactivate the alarm with KEYLESS-
GO: press the Start/Stop button in the igni-
tion lock. The SmartKey must be in the
vehicle.
or X
Lock or unlock the vehicle using KEYLESS-
GO. The SmartKey must be outside the
vehicle.
If you unlock the vehicle using the mechanical
key, the fuel filler flap will not be unlocked
automatically. X
To unlock the fuel filler flap: insert the
SmartKey into the ignition lock.
Removing the mechanical key
X
Push release catch C in the direction of
the arrow and at the same time remove
mechanical key D from the SmartKey.
For further information about: R
unlocking the driver's door ( Y
page 85)R
unlocking the trunk ( Y
page 87)R
locking the vehicle ( Y
page 85)
Inserting the mechanical key X
Push mechanical key D completely into
the SmartKey until it engages and release
catch C is back in its basic position. SmartKey battery
Important safety notes
G WARNING
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.
The SmartKey batteries contain perchlorate
material, which may require special handling
and regard for the environment. National
guidelines must be observed during disposal.
In California, see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/
index.cfm .
Mercedes-Benz recommends that you have
the battery replaced at a qualified specialist
workshop.
Checking the battery
X
Press the 7 or 6 button.
The battery is working properly if battery
check lamp C lights up briefly.
The battery is discharged if battery check
lamp C does not light up briefly. X
Change the battery ( Y
page 80).SmartKey 79
Opening and closing Z

i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the 7 or 6 button:R
locks or R
unlocks the vehicle
i You can get a battery at any qualified spe-
cialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery. X
Take the mechanical key out of the Smart-
Key ( Y
page 78).
X
Press mechanical key D into the opening
in the SmartKey in the direction of the
arrow until battery tray cover C opens.
When doing so, do not hold cover C shut.X
Remove battery tray cover C .
X
Repeatedly tap the SmartKey against your
palm until battery

Problems with the SmartKey Problem
Possible causes/consequences and P Solutions
You cannot lock or
unlock the vehicle
using the SmartKey. The SmartKey battery is discharged or nearly discharged. X
Vehicles without KEYLESS-GO or KEYLESS-GO start func-
tion: try again to lock/unlock the vehicle using the remote con-
trol function of the SmartKey. Point the tip of the key at the
driver's door handle from close range and press the 6 or
7 button.
If this does not work: X
Check the SmartKey battery ( Y
page 79) and replace it if nec-
essary ( Y
page 80). X
Unlock ( Y
page 85) or lock ( Y
page 85) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves. X
Vehicles without KEYLESS-GO or KEYLESS-GO start func-
tion: try again to lock/unlock the vehicle using the remote con-
trol function of the SmartKey. Point the tip of the key at the
driver's door handle from close range and press the 6 or
7 button.
If this does not work: X
Unlock ( Y
page 85) or lock ( Y
page 85) the vehicle using the
mechanical key.
The SmartKey is faulty. X
Unlock ( Y
page 85) or lock ( Y
page 85) the vehicle using the
mechanical key. X
Have the SmartKey checked at a qualified specialist workshop.
You can no longer lock
or unlock the vehicle
using KEYLESS-GO. The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 79) and replace it if nec-
essary ( Y
page 80).
If this does not work: X
Unlock ( Y
page 85) or lock ( Y
page 85) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves. X
Unlock ( Y
page 85) or lock ( Y
page 85) the vehicle using the
mechanical key. SmartKey 81
Opening and closing Z

Problem
Possible causes/consequences and P Solutions
KEYLESS-GO is malfunctioning. X
Lock/unlock the vehicle using the remote control function of
the SmartKey. X
Have the vehicle and SmartKey checked at a qualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote
control function: X
Unlock ( Y
page 85) or lock ( Y
page 85) the vehicle using the
mechanical key. X
Have the vehicle and SmartKey checked at a qualified specialist
workshop.
The engine cannot be
started using the
SmartKey. 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 317).
or X
Jump-start the vehicle ( Y
page 319).
or X
Consult a qualified specialist workshop.
The engine cannot be
started using the Start/
Stop button. The
SmartKey is in the vehi-
cle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 79) and replace it if nec-
essary ( Y
page 80).
If this does not work: X
Start your vehicle with the SmartKey in the ignition lock.
There is interference from a powerful source of radio waves. X
Start your vehicle with the SmartKey in the ignition lock.82
SmartKey
Opening and closing

Problem
Possible causes/consequences and P Solutions
You have lost a Smart-
Key. X
Have the SmartKey deactivated at a qualified specialist work-
shop. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
Doors
Important safety notes
G WARNING
If children are left unsupervised in the vehicle,
they could: R
open the doors, thus endangering other
people or road users. R
get out and disrupt traffic. R
operate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they: R
release the parking brake. R
shifting the automatic transmission out of
park position PR
Start the engine.
There is a risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
You should preferably place luggage or loads
in the cargo compartment. Observe the load-
ing guidelines ( Y
page 272).
Unlocking and opening doors from
the inside
! The side windows will not open/close if
the battery is discharged or if the side win-
dows have iced up. It will then not be pos- sible to close the door. Do not attempt to
force the door closed. You could otherwise
damage the door or the side window.
When a door is opened, the side window on
that side opens slightly. When the door is
closed, the side window closes again.
X
To unlock and open a front door: pull
door handle D .
If the door is locked, locking knob C pops
up. The door is unlocked and opens. X
To unlock a rear door: pull up locking
knob C .
The door is unlocked and can be opened. X
To open a rear door: pull door handle D .
You can open a door from inside the vehicle
even if it has been locked. You can only open
the rear doors from inside the vehicle if they
are not secured by the child-proof locks
( Y
page 64).
If the vehicle has previously been locked with
the SmartKey from the outside, opening a
door from the inside will trigger the anti-theft Doors 83
Opening and closing Z