Mechanical key
General notes
If the vehicle can no longer be locked or
unlocked with the SmartKey or KEYLESS-GO,
use the mechanical key.
If you use the mechanical key to unlock and
open the driver's door or the trunk lid, the
anti-theft alarm system will be triggered
(
Ypage 73).
There are several ways to turn off the alarm:
XTo deactivate the alarm with the key:
press the %or& button on the key.
or
XInsert the SmartKey into the ignition lock.
or
XTo deactivate the alarm with KEYLESS-
GO: press the Start/Stop button in the igni-
tion lock. The SmartKey must be in the
vehicle.
or
XLock 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.
XTo unlock the fuel filler flap: insert the
SmartKey into the ignition lock.
Removing the mechanical key
XPush release catch :in the direction of
the arrow and at the same time remove
mechanical key ;from the SmartKey.
For further information about:
Runlocking the driver's door (Ypage 84)
Runlocking the cargo compartment
(
Ypage 89)
Rlocking the vehicle (Ypage 85)
Inserting the mechanical key
XPush mechanical key ;completely into
the SmartKey until it engages and release
catch :is back in its basic position.
SmartKey battery
Important safety notes
GWARNING
Batteries contain toxic and corrosive substan- ces. If batteries are swallowed, it can result in
severe health problems. There is a risk of fatalinjury.
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.
SmartKey79
Opening and closing
Z
Problems with the SmartKey
ProblemPossible causes/consequences andMSolutions
You cannot lock or
unlock the vehicle
using the SmartKey.The SmartKey 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 SmartKey. Point the tip of the key at the
driver's door handle from close range and press the %or
& button.
If this does not work:
XCheck the SmartKey battery (Ypage 80) and replace it if nec-
essary (
Ypage 80).
XUnlock (Ypage 84) or lock (Ypage 85) the vehicle using the
mechanical key.
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 SmartKey. Point the tip of the key at the
driver's door handle from close range and press the %or
& button.
If this does not work:
XUnlock (Ypage 84) or lock (Ypage 85) the vehicle using the
mechanical key.
The SmartKey is faulty.
XUnlock (Ypage 84) or lock (Ypage 85) the vehicle using the
mechanical key.
XHave 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.
XCheck the SmartKey battery (Ypage 80) and replace it if nec-
essary (
Ypage 80).
If this does not work:
XUnlock (Ypage 84) or lock (Ypage 85) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves.
XUnlock (Ypage 84) or lock (Ypage 85) the vehicle using the
mechanical key.
SmartKey81
Opening and closing
Z
ProblemPossible causes/consequences andMSolutions
KEYLESS-GO is malfunctioning.
XLock/unlock the vehicle using the remote control function of
the SmartKey.
XHave the vehicle and SmartKey checked at a qualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote
control function:
XUnlock (Ypage 84) or lock (Ypage 85) the vehicle using the
mechanical key.
XHave 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.
XSwitch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
XCheck the starter battery and charge it if necessary
(
Ypage 329).
or
XJump-start the vehicle (Ypage 331).
or
XConsult 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.
XUnlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 80) and replace it if nec-
essary (
Ypage 80).
If this does not work:
XStart your vehicle with the SmartKey in the ignition lock.
There is interference from a powerful source of radio waves.
XStart your vehicle with the SmartKey in the ignition lock.
82SmartKey
Opening and closing
Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle
from the inside. This can be useful if you wish
to lock the vehicle before pulling away, for
example.
XTo unlock:press button :.
XTo lock:press button ;.
If all the doors and the tailgate are closed,
the vehicle locks.
Meanwhile, the fuel filler flap will not be
locked or unlocked.
You cannot unlock the vehicle centrally from
the inside if the vehicle has been locked with
the SmartKey or KEYLESS-GO.
You can open a door from inside the vehicle
even if it has been locked. You can open the
rear doors from inside the vehicle unless they
are secured by the child-proof lock
(
Ypage 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
alarm system. Switch off the alarm
(
Ypage 73).
If a locked door is opened from the inside, the previous unlock status of the vehicle will be
taken into consideration if:
Rthe vehicle was locked using the locking
button for the central locking, or
Rif the vehicle was locked automatically
The vehicle will be fully unlocked if it had pre-
viously been fully unlocked. If only the driver's
door had been previously unlocked, only the door which has been opened from the inside
is unlocked.
Automatic locking feature
XTo deactivate:
press and hold button :
for approximately five seconds until a tone sounds.
XTo activate: press and hold button ;for
approximately five seconds until a tone
sounds.
If you press one of the two buttons and do not
hear a tone, the relevant setting has already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are
turning.
You could therefore lock yourself out if:
Rthe vehicle is being pushed.
Rthe vehicle is being towed.
Rthe vehicle is on a roller dynamometer.
You can also switch the automatic locking
function on and off using the on-board com-
puter (
Ypage 230).
Unlocking the driver's door (mechan-
ical key)
If the vehicle can no longer be locked or
unlocked with the SmartKey or KEYLESS-GO,
use the mechanical key.
If you use the mechanical key to unlock and
open the driver's door, the anti-theft alarm
system will be triggered (
Ypage 73).
84Doors
Opening and closing
XTake the mechanical key out of the Smart-
Key (
Ypage 79).
XInsert the mechanical key into the lock of
the driver's door as far as it will go.
XTurn the mechanical key counter-clockwise
as far as it will go to position1.
The door is unlocked.
XTurn the mechanical key back and remove
it.
XInsert the mechanical key into the Smart-
Key (
Ypage 79).
Locking the vehicle (mechanical key)
If the vehicle can no longer be locked with the
SmartKey or KEYLESS-GO, use the mechani-
cal key.
XOpen the driver's door.
XClose the front-passenger door, the rear
doors and the tailgate.
XPress the locking button on the driver’s
door (
Ypage 84).
XCheck whether the locking knobs on the
front-passenger door and the rear doors
are still visible. Press down the locking
knobs by hand, if necessary.
XClose the driver's door.
XTake the mechanical key out of the Smart-
Key (
Ypage 79).
XInsert the mechanical key into the lock of
the driver's door as far as it will go.
XTurn the mechanical key clockwise as far as
it will go to position 1.
XTurn the mechanical key back and remove
it.
XMake sure that the doors and the tailgate
are locked.
XInsert the mechanical key into the Smart-
Key (
Ypage 79).
iIf you lock the vehicle as described above,
the fuel filler flap is not locked. The anti-
theft alarm system is not armed.
Cargo compartment
Important safety notes
GWARNING
Parts of the body could become trapped dur-
ing automatic closing of the tailgate. More-
over, people, e.g. children, may be standing in the closing area or may enter the closing area
during the closing process. There is a risk of
injury.
Make sure that nobody is in the vicinity of the
closing area during the closing process.
Use one of the following options to stop the
closing process:
Rpress the Fbutton on the SmartKey.
Rpull or press the remote operating switch
on the driver's door.
Rpress the close button or STOP button on
the tailgate.
Rpull the handle on the tailgate.
Cargo compartment85
Opening and closing
Z
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tailgate is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning.
Turn off the engine before opening the tail-
gate. Never drive with the tailgate open.
GWARNING
If objects, luggage or loads are not secured or
not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury, particu-
larly in the event of sudden braking or a sud-
den change in direction.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
!The tailgate swings upwards and to the
rear when opened. Therefore, make sure
that there is sufficient clearance above and
behind the tailgate.
The opening dimensions of the tailgate can be
found in the "Vehicle data" section
(
Ypage 383).
You should preferably place luggage or loads
in the cargo compartment. Observe the load- ing guidelines (
Ypage 280).
Do not leave the SmartKey in the cargo com-
partment. You could otherwise lock yourself
out.
The tailgate can be:
Ropened and closed manually from outside
Rvehicles with EASY-PACK tailgate:
open/close automatically from the outside
Rvehicles with EASY-PACK tailgate:
open/close automatically from the inside
Rvehicles with EASY-PACK tailgate and
with KEYLESS-GO or KEYLESS-GO start function:
closed with the remote operating
switch on the SmartKey
Rreleased with the emergency release from
the inside
Obstacle recognition with tailgate
reversing feature
On vehicles with an EASY-PACK tailgate, the
tailgate is equipped with automatic obstacle
recognition with a reversing feature. If a solid
object blocks or restricts the tailgate when
automatically opening or closing, this proce-
dure is stopped. If the tailgate is stopped dur-
ing the closing process, the tailgate automat-
ically opens again slightly. The automatic
obstacle recognition with reversing feature is
only an aid. It is not a substitute for your
attentiveness when opening and closing the
tailgate.
GWARNING
The reversing feature does not react:
Rto soft, light and thin objects, e.g. small fin-
gers
Rover the last 1/3 in (8 mm) of the closing
movement
This means that the reversing feature cannot
prevent someone being trapped in these sit-
uations. There is a risk of injury.
Make sure that no body parts are in close
proximity during the closing procedure.
If somebody becomes trapped:
Rpress the Fbutton on the SmartKey, or
Rpull or press the remote operating switch
on the driver's door or
Rpress the closing button/STOP button in
the tailgate or
Rpull the handle on the tailgate
86Cargo compartment
Opening and closing
Opening and closing manually
Opening
XPress the %button on the key.
XPull handle :.
XRaise the tailgate.
Closing
XPull the tailgate down using handle :.
XAllow the tailgate to drop into the lock.
XLock the vehicle if necessary with the &
button on the SmartKey or with KEYLESS-
GO.
Opening/closing automatically from
outside
Important safety notes
GWARNING
Parts of the body could become trapped dur-
ing automatic closing of the tailgate. More-
over, people, e.g. children, may be standing in
the closing area or may enter the closing area
during the closing process. There is a risk of
injury.
Make sure that nobody is in the vicinity of the
closing area during the closing process.
Use one of the following options to stop the
closing process:
Rpress the Fbutton on the SmartKey.
Rpull or press the remote operating switch
on the driver's door.
Rpress the close button or STOP button on
the tailgate.
Rpull the handle on the tailgate.
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tailgate
is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning.
Turn off the engine before opening the tail-
gate. Never drive with the tailgate open.
!The tailgate swings upwards and to the
rear when opened. Therefore, make sure
that there is sufficient clearance above and
behind the tailgate.
Two warning tones sound while the tailgate is
opening or closing.
The opening dimensions of the tailgate can be
found in the "Vehicle data" section
(
Ypage 383).
Opening automatically
You can open the tailgate automatically with
the SmartKey or the handle in the tailgate.
XPress and hold the Fbutton on the key
until the tailgate opens.
or
XIf the tailgate is unlocked, pull the handle
and let it go again immediately.
Cargo compartment87
Opening and closing
Z
Closing automatically
Vehicles with EASY-PACK tailgate:you can
also close the tailgate automatically from out-
side.
For example ,vehicle swit hKEYLESS-GO
XTo close: press button :on the tailgate.
or
XVehicles with EASY-PACK tailgate and
KEYLESS-GO or KEYLESS-GO start func-
tion: if the key is located in the immediate
vicinity of the vehicle, press the Fbut-
ton on the key.
You can release the button as soon as the
tailgate starts to close.
Vehicles with EASY-PACK tailgate and
KEYLESS-GO: when the driver's door is
closed you can simultaneously close the tail-
gate and lock the vehicle. The KEYLESS-GO
key must be in the rear detection range of the
vehicle.
XTo close the tailgate and lock the vehi-
cle: press locking button ;on the tailgate.
If a SmartKey is detected outside the vehi-
cle within the rear detection range of KEY-
LESS-GO, the tailgate closes.
The vehicle is locked.
XTo stop the closing process : press but-
ton :on the tailgate again.
or
XPull the handle in the tailgate.
or
XPress the Fbutton on the key until the
tailgate stops. or
XPress or pull the remote operating switch
on the driver's door.
Opening/closing automatically from
inside
Important safety notes
GWARNING
Parts of the body could become trapped dur-
ing automatic closing of the tailgate. More-
over, people, e.g. children, may be standing in the closing area or may enter the closing area
during the closing process. There is a risk of
injury.
Make sure that nobody is in the vicinity of the
closing area during the closing process.
Use one of the following options to stop the
closing process:
Rpress the Fbutton on the SmartKey.
Rpull or press the remote operating switch
on the driver's door.
Rpress the closing or locking button on the
tailgate.
Rpull the handle on the tailgate
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tailgate is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning.
Turn off the engine before opening the tail-
gate. Never drive with the tailgate open.
!The tailgate swings upwards and to the
rear when opened. Therefore, make sure
that there is sufficient clearance above and
behind the tailgate.
Two warning tones sound while the tailgate is
opening or closing.
88Cargo compartment
Opening and closing