2016 MERCEDES-BENZ C CLASS keyless

Problems with the SmartKey Problem
Possible causes/consequences and P Solutions
You can no longer lock or
unlock the vehicle using
the SmartKey. The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 84) and replace it if necessary
( Y
page 84).
If this does not work: X
Unlock ( Y
page 89) or lock ( Y
page 89) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves. X
Unlock ( Y
page 89) or lock ( Y
page 89) the vehicle using the
mechanical key.
The SmartKey is faulty. X
Unlock ( Y
page 89) or lock ( Y
page 89) 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. KEYLESS-GO was deactivated. X
Reactivate KEYLESS-GO ( Y
page 82).
The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 84) and replace it if necessary
( Y
page 84).
If this does not work: X
Unlock ( Y
page 89) or lock ( Y
page 89) the vehicle using the
mechanical key.
There is interference from a powerful source of radio waves. X
Unlock ( Y
page 89) or lock ( Y
page 89) the vehicle using the
mechanical key.
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 con-
trol function: X
Unlock ( Y
page 89) or lock ( Y
page 89) the vehicle using the
mechanical key. X
Have the vehicle and SmartKey checked at a qualified specialist
workshop.86
SmartKey
Opening and closing

Unlocking and opening doors from
the inside 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 67). If
the vehicle has been locked with the SmartKey
or with KEYLESS-GO, opening a door from the
inside will trigger the anti-theft alarm system.
Switch off the alarm ( Y
page 79).
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 door handle D .
Locking knob C pops up and the door
unlocks. X
To open a rear door: pull door handle D
again.
The door opens.
Centrally locking and unlocking the
vehicle from the inside You can centrally lock and unlock the vehicle
from the inside. The switches are on the driver’s
door. X
To unlock: press button C .X
To lock: press button D .
When the front-passenger door is closed, the
vehicle is locked.
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.
The doors can be opened from the inside. You
can only open the rear doors from inside the
vehicle if they are not secured by the child-proof
locks ( Y
page 67).
If the vehicle has been locked with the SmartKey
or with KEYLESS-GO, opening a door from the
inside will trigger the anti-theft alarm system.
Switch off the alarm ( Y
page 79).
When a locked door is opened from inside the
vehicle, the previous unlocking process will be
acknowledged if the vehicle: R
has been locked with the locking button for
the central locking or R
has been locked automatically
The vehicle will be fully unlocked if it had previ-
ously 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.88
Doors
Opening and closing

Closing X
Pull the trunk lid down using recess C and
push it closed. X
Lock the vehicle if necessary with the 7
button on the SmartKey or with KEYLESS-GO
( Y
page 82).
Opening/closing automatically from
outside
Important safety notes
G WARNING
Parts of the body could become trapped dur-
ing automatic closing of the trunk lid. 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: R
press the T button on the SmartKey.R
pull or press the remote operating switch
on the driver's door. R
press the closing or locking button on the
trunk lid. R
pull the trunk lid handle
G WARNING
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,
especially if the vehicle is in motion. There is a
risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
open.
Vehicles with HANDS-FREE ACCESS:
It is also possible to stop the closing process by
performing a kicking movement under the rear
bumper.
! The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
The opening dimensions of the trunk lid can be
found in the "Vehicle data" section
( Y
page 394).
Opening automatically You can open the trunk lid automatically using
the SmartKey or the handle in the trunk lid. X
Press and hold the T button on the Smart-
Key until the trunk lid opens.
or X
If the trunk lid is unlocked, pull the trunk lid
handle and let it go again immediately.
Closing automatically
C
Closing button
D
Locking button X
Press closing button C in the trunk lid.Trunk 91
Opening and closing Z

Vehicles with trunk lid remote closing fea-
ture and KEYLESS-GO: when the driver's door
is closed you can simultaneously close the trunk
lid and lock the vehicle. The KEYLESS-GO key
must be in the rear detection range of the vehi-
cle. X
Press locking button D in the trunk lid.
If KEYLESS-GO detects a SmartKey outside
the vehicle, the trunk lid closes. The vehicle is
locked.
If KEYLESS-GO detects a SmartKey in the trunk,
the trunk lid opens again after it is closed.
If KEYLESS-GO detects a second SmartKey out-
side the vehicle, the trunk lid remains closed.
If KEYLESS-GO detects a SmartKey in the trunk
before the closing procedure starts, the trunk lid
remains open.
HANDS-FREE ACCESS
Important safety notes
G WARNING
The vehicle's exhaust system may be very hot.
You could burn yourself by touching the
exhaust system if you use HANDS-FREE
ACCESS. There is a risk of injury. Always
ensure that you only make the kicking move-
ment within the detection range of sensors.
! If the SmartKey is within the rear detection
range of KEYLESS-GO, the following situa-
tions, for example, could lead to the uninten-
tional opening of the trunk: R
using a car wash R
using a power washer
Make sure that the SmartKey is at least 10 ft
(3 m) away from the vehicle.
General notes With KEYLESS-GO and HANDS-FREE ACCESS,
you can open or close the trunk lid or stop the
procedure without using your hands. This is use-
ful if you have your hands full. To do this, make
a kicking movement under the bumper with your
foot. Observe the following points: R
Carry your KEYLESS-GO key about your per-
son. The KEYLESS-GO key must be in the rear
detection range of the vehicle. R
When making the kicking movement, make
sure that you are standing firmly on the
ground and that there is sufficient clearance
to the rear of the vehicle. You could otherwise
lose your balance e.g. on ice.
R
Always ensure that you only make the kicking
movement within the detection range of sen-
sors C . R
Stand at least 12 in (30 cm) away from the
rear area while doing so. R
Do not come into contact with the bumper
while making the kicking movement. Other-
wise, the sensors may not function correctly. R
HANDS-FREE ACCESS does not function
when the engine is started. R
Dirt caused by road salt around sensors C
may restrict functionality.
Using the HANDS-FREE ACCESS with a pros-
thetic leg may restrict functionality. R
If a KEYLESS-GO key is within the rear detec-
tion range of KEYLESS-GO, HANDS-FREE
ACCESS could be triggered. The trunk lid
could thus be opened or closed unintention-
ally, for example, if you: -
sit on the edge of the trunk. -
set something down or lift something up
behind the vehicle. -
polish the rear of the vehicle.
Do not carry the KEYLESS-GO key about your
person in these situations or in situations sim-
ilar to these. This will prevent the uninten-
tional opening/closing of the trunk.92
Trunk
Opening and closing

The side windows cannot be operated from the
rear when the override feature for the side win-
dows is activated ( Y
page 67).
Information on opening and closing the roller
sunblinds on the rear side windows
( Y
page 317).
Convenience opening
General notes If the SmartKey is in close proximity to the vehi-
cle, the convenience opening function is availa-
ble.
Vehicles with KEYLESS-GO or KEYLESS-GO
start function: you can ventilate the vehicle
before you start driving.
To do this, the SmartKey is used to carry out the
following functions simultaneously: R
unlock the vehicle R
open the side windows R
open the sliding sunroof or the panorama roof
with power tilt/sliding panel and the roller
sunblind R
switch on the seat ventilation for the driver's
seat
The "convenience opening" feature is also avail-
able when the vehicle is unlocked.
Convenience opening X
Press and hold the 6 button on the Smart-
Key until the side windows and the sliding
sunroof or the panorama roof with power tilt/
sliding panel are in the desired position.
If the roller sunblinds of the panorama roof
with power tilt/sliding panel are closed, the
roller sunblinds are opened first. X
Press and hold the 6 button once more
until the panorama roof with power tilt/slid-
ing panel reaches the desired position. X
To interrupt convenience opening: release
the 6 button. Convenience closing feature
Important safety notes
G WARNING
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. There is a risk of injury.
Observe the complete closing procedure
when the convenience closing feature is oper-
ating. Make sure that no body parts are in
close proximity during the closing procedure.
Vehicles with KEYLESS-GO or KEYLESS-GO
start function: if the SmartKey is in close prox-
imity to the vehicle, the convenience closing
function is available.
When you lock the vehicle, you can simultane-
ously: R
close the side windows R
close the sliding sunroof or the panorama roof
with power tilt/sliding panel
On vehicles with a panorama roof with power
tilt/sliding panel, you can then close the roller
sunblinds.
Notes on the automatic reversing feature for: R
the side window ( Y
page 95)R
the sliding sunroof or the panorama roof with
power tilt/sliding panel ( Y
page 99)
Using the SmartKey X
Press and hold the 7 button until the side
windows and the sliding sunroof or the pano-
rama roof with power tilt/sliding panel are
fully closed. X
Make sure that all the side windows and the
sliding sunroof or panorama roof with power
tilt/sliding panel are closed. X
Vehicles with panorama roof with power
tilt/sliding panel: press and hold the 7
button once more until the roller sunblinds of
the panorama roof with power tilt/sliding
panel close. X
To interrupt convenience closing: release
the 7 button.96
Side windows
Opening and closing

Using KEYLESS-GO The driver's door and the door at which the han-
dle is used, must both be closed. The SmartKey
must be outside the vehicle. The gap between
the SmartKey and the corresponding door han-
dle should not be greater than 3 ft (1 m).
X
Touch recessed sensor surface C on the
door handle until the side windows and the
sliding sunroof or the panorama roof with
power tilt/sliding panel are fully closed.
Make sure you only touch recessed sensor
surface C .X
Make sure that all the side windows and the
sliding sunroof or panorama roof with power
tilt/sliding panel are closed. X
Vehicles with panorama roof with power
tilt/sliding panel: touch recessed sensor
surface C on the door handle again until the
roller sunblinds of the panorama roof with
power tilt/sliding panel close. X
To interrupt convenience closing: release
recessed sensor surface C on the door han-
dle.
Resetting the side windows If a side window can no longer be closed fully,
you must reset it. X
Close all the doors. X
Turn the SmartKey to position 1 or 2 in the
ignition lock. X
Pull the corresponding switch on the door
control panel until the side window is com-
pletely closed ( Y
page 95).X
Hold the switch for an additional second. If the side window opens again slightly: X
Immediately pull the corresponding switch on
the door control panel until the side window is
completely closed ( Y
page 95).X
Hold the switch for an additional second. X
If the respective side window remains closed
after the button is released, then it has been
set correctly. If this is not the case, repeat the
steps above.
Side windows 97
Opening and closing Z

Problems with the steering wheel heating Problem
Possible causes/consequences and P Solutions
The steering wheel heat-
ing has switched off pre-
maturely or cannot be
switched on. The on-board voltage is too low because too many electrical consum-
ers are switched on. X
Switch off electrical consumers that you do not need, such as the
rear window defroster or interior lighting.
EASY-ENTRY/EXIT feature
Important safety notes
G WARNING
When the EASY-ENTRY/EXIT feature adjusts
the steering wheel, you and other vehicle
occupants – particularly children – could
become trapped. There is a risk of injury.
While the EASY-ENTRY/EXIT feature is mak-
ing adjustments, make sure that no one has
any body parts in the sweep of the steering
wheel.
Move the steering wheel adjustment lever if
there is a risk of entrapment by the steering
wheel. The adjustment process is stopped.
Press one of the memory function position but-
tons. The adjustment process is stopped. This
function is only available on vehicles with mem-
ory function.
G WARNING
If children activate the EASY-ENTRY/EXIT fea-
ture, they can become trapped, particularly
when unattended. There is a risk of injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
G WARNING
If you drive off while the EASY-ENTRY/EXIT
feature is making adjustments, you could lose
control of the vehicle. There is a risk of an
accident.
Always wait until the adjustment process is
complete before driving off. The EASY-ENTRY/EXIT feature makes getting in
and out of your vehicle easier.
You can activate and deactivate the EASY-
ENTRY/EXIT feature using the multimedia sys-
tem (see the separate operating instructions).
Position of the steering wheel when the
EASY-ENTRY/EXIT feature is active The steering wheel swings upwards when you: R
remove the SmartKey from the ignition lock R
with KEYLESS-GO: open the driver's door;
KEYLESS-GO must be in position 1R
with the SmartKey: open the driver's door;
the SmartKey must be in position 0 or 1 in the
ignition lock ( Y
page 146) R
open the driver's door when the ignition is
switched off
i The steering wheel only tilts upwards if the
driving position is stored after the steering
column adjustment has been adjusted
( Y
page 116).
The most recent driving position of the steering
wheel is stored if: R
the ignition is switched off R
the setting is stored with the memory function
( Y
page 116).
i The steering wheel only moves upwards if it
has not already reached the upper steering
limiter.112
Steering wheel
Seats, steering wheel and mirrors

Position of the steering wheel for driv-
ing The steering wheel is moved to the last selected
position when: R
the driver's door is closed and you insert the
SmartKey into the ignition lock R
you close the driver's door when the ignition
is switched on R
you press the Start/Stop button once on vehi-
cles with KEYLESS-GO
i The steering wheel only returns to the last
set position if the driving position is stored
after the seat or steering column has been
adjusted ( Y
page 116).
The most recent driving position of the steering
wheel is stored if: R
the ignition is switched off R
the setting is stored with the memory function
( Y
page 116).
Crash-responsive EASY-EXIT feature If the crash-responsive EASY-EXIT feature is trig-
gered in an accident, the steering column will
move upwards when the driver's door is opened
or the SmartKey is removed from the ignition
lock. This makes it easier to exit the vehicle and
rescue the occupants.
The crash-responsive EASY-EXIT feature is only
operational if the EASY-EXIT/ENTRY feature is
activated in the multimedia system (see the sep-
arate operating instructions).
Mirrors
Rear-view mirror X
Anti-glare mode: flick anti-glare lever C for-
wards or back.
Exterior mirrors
Important safety notes
G WARNING
You could lose control of your vehicle if you do
the following while driving: R
adjust the driver's seat, head restraint,
steering wheel or mirrors R
fasten the seat belt
There is a risk of an accident.
Adjust the driver's seat, head restraint, steer-
ing wheel and mirror and fasten your seat belt
before starting the engine.
G WARNING
The exterior mirror on the front-passenger
side reduces the size of the image. Visible
objects are actually closer than they appear.
This means that you could misjudge the dis-
tance from road users traveling behind, e.g.
when changing lane. There is a risk of an acci-
dent.
For this reason, always make sure of the
actual distance from the road users traveling
behind by glancing over your shoulder.
Adjusting the exterior mirrors Mirrors 113
Seats, steering wheel and mirrors Z