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27
Keys, doors, windows, sun roof
Picture no: 17349t.tif
Electronic immobiliser The system checks whether the vehicle is
allowed to start with the key used. Once
the transponder in the key is recognised,
the vehicle can be started.
The electronic immobiliser activates
automatically when the key is removed
from the ignition switch.
Picture no: 18231s.tif
Control indicator for immobilizer A
Control indicator A illuminates briefly
when the ignition is switched on.
If the control indicator flashes when the
ignition is on, there is a fault in the system;
the engine cannot be started. Switch off
the ignition and then repeat the start
attempt.
If the control indicator A continues to
flash, please try to start the engine using
the second key and contact a workshop. If control indicator
A illuminates after the
engine has started, there is a fault in the
engine electronics or transmission
electronics 33142, 3148, 3156 or there is
water in the diesel fuel filter 33244.
Note
The immobiliser does not lock the doors.
You should always lock the vehicle after
leaving it and switch on the anti-theft
alarm system 3 3 33, 337.
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Page 34 of 284
28 Keys, doors, windows, sun roof
Picture no: 18407s.tif
Central locking system with key
activation
3
Used to unlock and lock doors and
luggage compartment.
Central locking system with remote
control332.
Picture no: 18408s.tif
To unlock
Turn the key in the driver’s door lock to the
front: all doors and the luggage
compartment will be unlocked.
Pull handle to open doors.
Fuel filler cap 3153.
Picture no: 18158s.tif
Open luggage compartment
When the central locking system is
unlocked, pull the button beneath the
lever.
After fitting certain accessories, it might
not be possible to keep the tailgate in the
open position.
9
Warning
Do not drive with the tailgate open or
ajar, e.g. when transporting bulky
objects, since toxic exhaust gas could
penetrate the interior.
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Page 35 of 284

29
Keys, doors, windows, sun roof
Picture no: 18246s.tif
Close luggage compartment
Close the luggage compartment with the
handle on the inside of the tailgate.
Do not operate the button beneath the
handle when closing. Otherwise the
luggage compartment will once again be
unlocked.
Picture no: 18409s.tif
To lock
Close doors and luggage compartment.
Turn the key in the driver’s door lock
towards the rear: all doors and the
luggage compartment will be locked.
Fuel filler cap 3153.
Picture no: 18243s.tif
Central locking button for locking and
unlocking the doors from inside the
vehicle
Press button m in the centre console: doors
are locked or unlocked.
The LED in the central locking button m
comes on for approx. 2 minutes once the
vehicle is locked with the key in the driver’s
door lock.
If the doors are locked from inside using the
central locking button while the vehicle is in
motion, the LED m stays on.
If the key is in the ignition, locking is only
possible if all doors are closed.
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Page 36 of 284

30 Keys, doors, windows, sun roofMalfunction in central locking system
To unlockTurn the key in the driver’s door lock to the
front until it stops. Turn the key back and
remove it. The other doors can be opened
by pulling the handle on the inside of the
doors. The luggage compartment and fuel
filler cap remain locked.
Picture no: 18410s.tif
To lockPut the key in the opening above the lock
on the inside of the door and activate the
lock audibly by lifting with the key, then
close the door. This procedure must be
followed for every door. The driver’s door
can also be locked from the outside using
the lock. The unlocked fuel filler cap and
tailgate or boot lid cannot be locked. Note
z
If the driver’s door is not closed properly,
the central locking system will not lock.
z To lock the doors from the inside (e. g. to
prevent unwanted entry from outside),
press central locking button m in the
centre console.
z The doors can also be opened from the
inside by pulling the handle even when
the central locking system is locked.
z Locked doors unlock automatically in
the event of an accident of a certain
severity (to allow external help to gain
access). The hazard warning lamps and
courtesy lamp also come on. For this to
occur, the key must be in the ignition
switch.
z If the central locking system is
overloaded as a result of repeated
operation at short intervals, the power
supply is cut off for a brief period.
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31
Keys, doors, windows, sun roof
Picture no: 17029t.tif
Remote control
3
Depending on the equipment of the
vehicle, one of the remote controls
depicted on this page will be used.
The remote control is integrated in the key.
Used to operate:
zcentral locking system,
z mechanical anti-the ft locking system 3,
z anti-theft alarm system 3.
On cars with electric windows, the windows
can be opened and closed from outside
using the remote control 3345.
Picture no: 17030t.tif
The remote control has a range of
approx. 5 metres. This range can be
affected by outside influences. Aim the
remote control at the vehicle to operate.
The hazard warning lamps flash to confirm
remote control operation.
Handle the remote control with care,
protect it from mo isture and high
temperatures and avoid unnecessary
operation. Fault
If the central locking system cannot be
operated with the remote control, it may be
due to the following:
z
Range exceeded.
z Remote control battery voltage too low.
Change battery.
z Frequent, repeated operation of the
remote control outside the reception
range of the vehicle (e.g. too far from
vehicle, remote control is then no longer
recognised). Remote control
synchronisation.
z If the central locking system is
overloaded as a result of repeated
operation at short intervals. The power
supply is cut off for a brief period.
z Interference from higher-power radio
waves from other sources.
Open driver’s door with key 335.
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Page 38 of 284
32 Keys, doors, windows, sun roof
Picture no: 17031t.tif
Remote control battery replacement
Replace the battery as soon as the range
of the remote control begins to shrink.
Batteries do not belong in household
waste. They must be disposed of at an
appropriate recycling collection point.
Key with foldaway key sectionExtend the key 326. Open the remote
control. Replace the battery (battery
type CR 20 32), noting installation position.
Close the remote control and synchronise. Key with fixed key section
Have the battery changed in a workshop.
Synchronise r
emote control
After replacing the battery, unlock the door
with the key in the lock 335. The radio
remote control will be synchronised when
you switch on the ignition.
Picture no: 18399s.tif
Central locking system with
remote control
3
Used to unlock and lock doors, luggage
compartment and fuel filler flap.
Central locking system with key
activation 328.
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Page 39 of 284

33
Keys, doors, windows, sun roof
Picture no: 16968t.tif
To unlock
Press button q on radio remote control.
Pull handle to open doors.
Selective unlocking
3
You can set the system so that pressing the
button q once unlocks just the driver’s
door, and pressing the button q twice
unlocks the entire vehicle.
This function can be activated and
deactivated depending on the key used,
see "Personalised key", P5 339 341.
Picture no: 17042t.tif
To lock
Close doors, luggage compartment and
tank flap.
Press button p on radio remote control.
Picture no: 17043t.tif
Mechanical anti-theft locking system 3
All doors must be closed.
If the ignition was on, the driver’s door
must be opened and closed once so that
the vehicle can be secured.
All doors are secured against opening.
Within 10 seconds of locking, press
the pbutton on the remote control again.
The mechanical anti-theft locking system is
switched off when the vehicle is unlocked.
9
Warning
Do not use the system if there are people
in the vehicle! The doors cannot be
unlocked from the inside.
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Page 40 of 284

34 Keys, doors, windows, sun roof
Picture no: 18243s.tif
Central locking button for locking and
unlocking the doors from inside the
vehicle
Press button m in the centre console: doors
are locked or unlocked.
The LED in the central locking button m
comes on for approx. 2 minutes once the
vehicle is locked with the remote control.
If the doors are locked from inside using the
central locking button while the vehicle is in
motion, the LED m stays on. If the key is in the ignition, locking is only
possible if all doors are closed.
The doors cannot be unlocked with this
button when the anti-theft locking system
3
is activated.
Note
z If the driver’s door is not closed properly,
the central locking system will not lock.
z The doors lock again automatically a
short time after unlocking the vehicle
using the remote control if no door is
opened in the meantime.
z To lock the doors from the inside (e. g. to
prevent unwanted entry from outside),
press central locking button m in the
centre console.
z The doors can also be opened from the
inside by pulling th e handle even when
the central locking system is locked.
z Locked doors unlock automatically in
the event of an accident of a certain
severity (to allow exte rnal help to gain
access). The hazard warning lamps and
courtesy lamp also come on. For this to
occur, the key must be in the ignition
switch. Fault
If the central locking system cannot be
operated with the remote control, it may be
due to the following:
z
If the central locking system is
overloaded as a result of repeated
operation at short intervals. The power
supply is cut off for a brief period.
z Faulty fuse in fuse box 3209.
Please contact a workshop to have the
cause of the fault remedied.
Opening driver’s door with key 335.
Automatic locking 3
Above a certain speed, the central locking
system automatically locks all doors.
This function can be activated and
deactivated depending on the key used,
see "Personalised key", P4 339 341.
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