2007-2013 Mercedes C Class 4 Door Opening and closing -> Doors User Manual
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Opening and closing -> Doors for Your Mercedes C Class 4 Door Second Generation (2007-2013)

Problem Possible causes/consequences and M Solutions
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 298).
or
X
Jump-start the vehicle (Y page 302).
or
X
Consult a qualified specialist workshop.
The engine cannot be
started using the
SmartKey.
The steering lock is mechanically blocked.
X
Remove the SmartKey and reinsert it into the ignition lock. While
doing this, turn the steering wheel in both directions.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle.
Adoor is open. Therefore, the SmartKey cannot be detected as
easily.
X
Close the door and try to start the vehicle again.
There is interference from a powerful source of radio waves.
X
Start your vehicle with the SmartKey in the ignition lock.
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 P
R
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 persons, particularly children are subjected
to prolonged exposure to extreme heat or
cold, there is a risk of injury, possibly even
fatal. Never leave children unattended in the
vehicle.
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
Doors
79
Opening and closing
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are notsecured by the child-proof locks
(Y page 63).
Only open the door when the traffic situation
permits.
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 71).
X
To unlock a front door: pull door
handle ;.
Locking knob : pops up.
The door is unlocked and can be opened.
X
To open a front door: pull door
handle ;.
X
To unlock a rear door: pull up locking
knob :.
The door is unlocked and can be opened.
X
To open a rear door: pull door handle ;.
Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle
from the inside.
You cannot unlock the vehicle centrally from
the inside if the vehicle has been locked with
the SmartKey or KEYLESS-GO.
X
To unlock: press button :.
X
To lock: press button ;.
If the front-passenger door is closed, the
vehicle locks.
Meanwhile, the fuel filler flap will not be
locked or unlocked.
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 63).
Only open the door when the traffic situation
permits.
If the vehicle was previously locked with the
SmartKey or with KEYLESS-GO, opening the
vehicle from the inside will activate the anti-
theft alarm system. Switch off the alarm
(Y page 71).
If the vehicle has been locked using the
locking button for the central locking, or has
been locked automatically, and a door is
opened from the inside:
R
the vehicle will be fully unlocked if it had
previously been fully unlocked
R
only the door which has been opened form
the inside is unlocked if only the driver's
door had been previously unlocked
If the vehicle has been locked centrally with
the SmartKey or with KEYLESS-GO, it is not
unlocked when the release button for the
central locking is used.
80
Doors
Opening and closing
Automatic locking feature
The vehicle is locked automatically when the
ignition is switched on and the vehicle's
wheels are turning at a speed in excess of
9 mph (15 km/h).
You could therefore be lockedout if:
R
the vehicle is being pushed.
R
the vehicle is being towed.
R
the vehicle is on a roller dynamometer.
X
To deactivate: press and hold button :
for about five seconds until a tone sounds.
X
To activate: press and hold button ; for
about five seconds until a tone sounds.
i
If you press one of thetwo buttons and
do not hear a tone, the relevant setting has
already been selected.
You can also switch the automatic locking
function on and off using the on-board
computer (Y page 211).
Unlocking the driver's door
(mechanical key)
If the vehicle can no longer be unlocked with
the SmartKey, use the mechanical key.
If you use the mechanical key to unlockand
open the driver's door, the anti-theftalarm
system will be triggered (Y page 71).
X
Take the mechanical key out of the
SmartKey (Y page 76).
X
Insert the mechanical key into the lock of
the driver's door as far as it will go.
X
Turn the mechanical key counter-clockwise
to position 1.
The door is unlocked.
X
Turn the mechanical key back and remove
it.
X
Insert the mechanical key into the
SmartKey.
Locking the vehicle (mechanical key)
If the vehicle can no longer be locked with the
SmartKey, use the mechanical key.
X
Open the driver's door.
X
Close the front-passenger door, the rear
doors and the trunk lid.
X
Press the locking button (Y page 80).
X
Check whether the locking knobs on the
front-passenger door and the rear doors
are still visible. Press down the locking
knobs manually, if necessary (Y page 79).
X
Close the driver's door.
X
Take the mechanical key out of the
SmartKey (Y page 76).
X
Insert the mechanical key into the lock of
the driver's door as far as it will go.
Doors
81
Opening and closing
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