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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Page 53 of 284

47
Keys, doors, windows, sun roof
To raise
With the sun roof closed, press button ü.
The sun roof is raised at the rear.
To open
Press button ü again with the sun roof in
the raised position. The sun roof opens
automatically until it reaches its limit
position.
To close
Hold down button d until the sun roof is
completely closed.
Picture no: 18372s.tif
Sunblind
The sun blind can be opened and closed
manually whether the sun roof is open or
closed.
Note
z If the top of the roof is wet, tilt sun roof,
allow water to run off and then open sun
roof.
z When using a roof rack 3, check the free
movement of the sun roof in order to
avoid damage. It is only permitted to
raise the sun roof. Overload
If the system is overloaded, the power
supply is automatically cut off for a short
time.
The system is protected by fuses in the fuse
box – see page
3208.
Fault
If perfect function of the sun roof is not
guaranteed. Activate the electronics as
follows:
1. Switch on ignition.
2. Close the sun roof and hold button d
depressed at least 10 seconds.
Please contact a workshop to have the
cause of the fault remedied.
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Page 214 of 284
208 Self-help, vehicle careElectrical system Fuses
Data on the replacement fuse must match
the data on the defective fuse.
There are three fuse boxes in the vehicle:
zfront left, in the engine compartment,
z in the interior behind the light switch, or,
in right-hand drive cars, behind the
glove compartment,
z on the left of the luggage compartment,
behind a cover.
Before replacing a fuse, turn off the
respective switch and the ignition.
A blown fuse can be recognised by its
melted wire. Do not replace the fuse until
the cause of the fault has been remedied.
Only fit fuses of the specified current
rating. Each fuse has its current rating
written on it, the ratings are also colour
coded.
Picture no: 17259t.tif
Some functions are protected by several
fuses.
There may be fuses inserted with no
function.
Picture no: 17260t.tif
Different versions of fuses are used.
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Page 215 of 284
209
Self-help, vehicle care
Picture no: 18588s.tif
Fuses and the most important
circuits they protectFuse box in engine compartment
The fuse box is at the front left side of the
engine compartment.
To open, disengage the cover, fold cover
up and remove.
Picture no: 18589s.tif Picture no:
No. Circuit
1 Starter
2 Air conditioning system
3 Diesel fuel filter heater
4 Horn
5 Manual transmission automated,
automatic transmission
6 Engine control unit
7 Fog lamps
8 Engine cooling
9 Engine cooling
No. Circuit
10 Automated manual transmission
11 Glow plugs, ignition system
12 Headlamp range adjustment,
Adaptive Forward Lighting
13 Air conditioning system
14 Automated manual transmission
15 Main beam (right)
16 Main beam (left)
17 Main relay
18 Engine control unit
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Page 216 of 284
210 Self-help, vehicle care
Picture no: 18272s.tif
Fuse box in interior
The fuse box is located behind the light
switch. Pull the top edge of the panel and
fold down.
Picture no: 18403s.tif
In right-hand drive cars, the fuse box is
located behind a cover in the glove
compartment. Open the glove
compartment and remove the cover. To
close, first put on the cover, then lock it into
position.
No. Circuit
19 Airbags
20 Main relay
21 Main relay
22 Central control unit
23 Tyre repair kit
24 Fuel pump
25 Anti-lock brake system
26 Heated rear window
27 Anti-lock brake system
28 Interior fan
29 Cigarette lighter
30 Air conditioning system
31 Electric window (left)
32 Electric window (right)
33 Heated exterior mirrors
34 –
35 –
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Page 217 of 284
211
Self-help, vehicle care
Picture no: 18590s.tifPicture no: 18261s.tif
Fuse box in luggage compartment
The fuse box is located behind the cover in
the left luggage compartment trim.
Remove cover from fuse box.
Picture no: 18319s.tif
No. Circuit
1 –
2 Instruments, information display
3 Radio
4 Ignition switch
5 Windscreen washer system
6 Unlocking the luggage
compartment
7 Central locking system
8 –
9 Courtesy lamp
10 Electric power steering
11 Light switch, brake lamp
12 ABS, brake lamp
13 Heated steering wheel
14 Park pilot, rain sensor, interior
mirror
No. Circuit
1 Adaptive Forward Lighting
2 –
3 Seat heater (left)
4 Seat heater (right)
5 –
6 –
7 –
8 Flex-Fix system, towing equipment
No. Circuit
9 –
10 –
11 –
12 –
13 –
14 –
15 Flex-Fix system, towing equipment
16 –
17 Sun roof
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Page 218 of 284
212 Self-help, vehicle careBulb replacement Switch off the ignition and switch off the
relevant switch or close the doors.
Only hold a new bulb at the base! Do not
touch the bulb glass with your bare hands.
Replace the bulb, checking that the data
on the base matches that of the defective
bulb.
Picture no: 18422s.tif
To replace the bulb on the right-hand side,
remove the air hose from the air filter.
To replace the bulb on the left-hand side,
remove fuse box cover3209, and also
remove windscreen washer system
reservoir filler neck from above. Washing
fluid may escape if the reservoir is full to
the top.
Picture no: 18129s.tif
Halogen headlamp system Headlamp system has separate bulbs for
dipped beam 1 (outer bulbs) and main
beam 2 (inner bulbs).
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Page 236 of 284

230 Self-help, vehicle careWindows
Use a soft lint-free cloth or chamois leather
together with window cleaner and insect
remover.
When cleaning the rear window, make sure
the heating element inside the window is
not damaged.
For mechanical removal of ice, use a sharp-
edged ice scraper. Press the scraper firmly
against the glass so that no dirt can get
under it and scratch the glass.
Clean smearing wiper blades with a soft
cloth and window cleaner.
Sun roof 3
Never clean with solvents or abrasives,
fuels, aggressive agents (e.g. paintwork
cleaner, solutions containing acetone,
etc.), acidic or strongly alkaline agents or
scourers.
No stickers may be applied to the sun roof. Locks
The locks are lubricated with a high-quality
locking cylinder grease
in the factory. Only
use de-icer in urgent cases, since it has a
de-greasing effect and affects the
operation of the locks. Have the locks re-
greased in a workshop after using de-icer.
Engine compartment
Clean painted surfaces in the engine
compartment like any other painted
surface.
It is advisable to wash the engine
compartment before and after winter and
preserve it with wax. Cover alternator and
brake fluid reservoir with plastic sheets
before washing the engine.
When washing the engine with a steam-jet
cleaner, do not direct the steam jet at
components of the anti-lock brake system,
the air conditioning system, the climate
control system, belt drive or the fuse box.
After an engine wash, have all engine room
components preserved thoroughly by a
workshop using protective wax.
Do not use high-pressure jet cleaners. Underbody
Some areas of the vehicle underbody have
a PVC undercoating while other critical
areas have a durable protective wax
coating.
After the underbody is washed, check the
underbody and have more protective wax
applied if necessary.
Bitumen/rubber materials could damage
the PVC coating. Have underbody work
carried out by a workshop.
Before and after winter, wash the
underbody and have the protective wax
coating checked.
Towing equipment
Do not clean the coupling ball bar with a
steam-jet or high-pressure jet cleaner.
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