
Problems with the key/remote control
Problem Possible causes/consequences and
0050
0050Solutions It is no longer possible
to lock the vehicle
using the remote
control.
The turn signals do not
flash when the vehicle
is locked. The doors are not closed properly.
X
Close the doors properly and lock the vehicle again. The central locking system has malfunctioned.
X
Lock the vehicle using the folding key (Y page 66).
X Have the central locking system checked as soon as possible
at a qualified specialist workshop. It is no longer possible
to lock or unlock the
vehicle using the
remote control. The key battery is weak or discharged.
X
Point the remote control at the driver's door handle from very
close range and press the 0036or0037 button.
If this does not work:
X Replace the key battery (Y page 69).
Or
X Lock the vehicle using the folding key (Y page 66). The remote control is faulty.
X
Lock the vehicle using the folding key (Y page 66).
X Have the key checked at a qualified specialist workshop. The key cannot be
turned in the ignition
lock. The steering lock has jammed mechanically.
X
Remove the key and insert it again into the ignition lock. Turn
the steering wheel from side to side while doing so. The engine cannot be
started using the key. The on-board voltage is too low.
X Switch off all non-essential consumers, such as 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 266).
Or
X Jump-start the vehicle (Y page 278).
Or
X Consult a qualified specialist workshop. You have lost a key. X
Have the key deactivated at a qualified specialist workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the mechanical locks replaced. 70
KeyOpening and closing

Useful information
This Operator's Manual describes all models
as well as standard and optional equipment
of your vehicle that were available at the time
of going to print. Country-specific variations
are possible. Note that your vehicle may not
be equipped with all of the described func-
tions. This also applies to systems and func-
tions relevant to safety.
Read the information on qualified specialist
workshops (Y page 26). Exterior lighting
Important safety notes
G
DANGER
Xenon bulbs carry a high voltage. You can get
an electric shock if you remove the cover of
the Xenon bulb and touch the electrical con-
tacts. There is a risk of fatal injury.
Never touch the parts or the electrical con-
tacts of the Xenon bulb. Always have work on
the Xenon bulbs carried out at a qualified spe-
cialist workshop. G
WARNING
Bulbs, lamps and connectors can get very hot
when operating. If you change a bulb, you
could burn yourself on these components.
There is a risk of injury.
Allow these components to cool down before
changing a bulb.
! Make sure the bulbs are always securely
installed.
If your vehicle is equipped with Bi-Xenon
bulbs, you can recognize this by the following:
the cone of light from the Xenon bulbs moves
from the top to the bottom and back again
when you start the engine. For this to be
observed, the low-beam headlamps must be
switched on before starting the engine.
The bulbs and lamps are an essential compo-
nent of vehicle safety. You must therefore make sure that these function correctly at all
times. Have the headlamp setting checked
regularly.
R
Always switch off the vehicle's lighting sys-
tem before changing a bulb.
This will prevent a short circuit.
R Do not touch the glass tube of new bulbs
with your bare hands. Always use a clean,
lint-free cloth or only touch the base of the
bulb when installing.
Even minor contamination can burn into
the glass surface and reduce the service life
of the bulbs.
R Do not use a bulb that has been dropped or
that has scratches on its glass tube.
The bulb could may explode.
R Only use bulbs in closed lamps which have
been designed for this purpose.
R Only use spare bulbs of the same type and
with the prescribed voltage
R Protect the bulbs from moisture when in
use.
If the new bulb still does not light up, consult
a qualified specialist workshop.
R Have the LEDs and bulbs of the following
lamps changed at a qualified specialist
workshop:
-the additional turn signals in the exterior
mirrors
- the high-mounted brake lamp
- LED daytime running lamps
- the Bi-Xenon bulbs
- front fog lamps
If you require assistance changing bulbs, con-
sult a qualified specialist workshop. Lamp failure indicator
The bulb failure indicator is only an aid. You
are responsible for the proper functioning of
the vehicle lighting. Insufficient or non-func-
tioning vehicle lighting puts the operating
safety of the vehicle at risk. 92
Exterior lightingLights and windshield wipers

For this reason, check the condition and func-
tion of your vehicle's lighting system and, if
necessary, that of the trailer before each jour-
ney.
The bulb failure indicator monitors all of the
exterior lighting lamps, except the perimeter
lamp and the trailer lighting. If a bulb fails,
either the 0049(Ypage 35) indicator lamp
lights up, or you will see a corresponding
message in the display (Y page 210).
i Depending on the equipment, the bulb
failure indicator can fail for all lamps with
the exception of the turn signal lamps. Light switch
Operation 00470058
Automatic headlamp mode
0048003F Lights off/daytime running lamp
mode
00490060 Parking lamps, license plate and
instrument lighting
004A0058 Low-beam/high-beam headlamps
004B005A Fog lamps
004C005E Rear fog lamp
If you hear a warning tone when you leave the
vehicle, the lights may still be switched on.
X Turn the light switch to 003For0058.
Or
X If the rear fog lamp is switched on: press
the light switch in to the stop. The turn signals, high-beam headlamps and
the high-beam flasher are operated using the
combination switch (Y
page 95).
Low-beam headlamps X
To switch on: turn the key to position 2in
the ignition lock or start the engine.
X Turn the light switch to position 0058.
The 0058 indicator lamp in the instrument
cluster lights up.
X To switch off: turn the light switch to
003F.
Daytime running lamps You can activate/deactivate the daytime run-
ning lamps function using the on-board com-
puter.
This is not possible in countries where day-
time running lamps are a legal requirement.
The daytime running lamps function must be
activated using the on-board computer:
R
vehicles with steering wheel buttons
(Y page 194)
R vehicles without steering wheel buttons
(Y page 185)
X To switch on: turn the light switch to the
003F position.
The low-beam headlamps, parking lamps
and license plate lamp are switched on
when the engine is running. The 0058indi-
cator lamp in the instrument cluster lights
up.
i USA only:
If you turn the light switch to the 0060or
0058 position, the parking lamps or low-
beam headlamps switch on. If you turn the
light switch to the 0058position, the day-
time running lamps remain switched on.
i Canada only:
If you turn the light switch to the 0058posi-
tion, the low-beam headlamps are switched
on. If you turn the light switch to the 0060 Exterior lighting
93Lights and windshield wipers Z

Combination switch
Turn signal lamps 0043
To indicate a right turn
0044 To indicate a left turn
X To indicate: press the combination switch
in desired direction 0043or0044 until it
engages.
The combination switch automatically
returns to its original position after large
steering movements.
X To indicate briefly: press the combination
switch briefly in desired direction 0043
or 0044.
The corresponding turn signal flashes three
times.
High-beam headlamps and high-beam
flasher 0043
High-beam headlamps
0044 High-beam flasher X
To switch on the high-beam head-
lamps: switch on the low-beam headlamps
(Y page 93).
X Press combination switch 0043forwards.
The 0057 indicator lamp in the instrument
cluster lights up.
i In the 0058position, the high-beam head-
lamps are only switched on when it is dark
and the engine is running.
X To switch off the high-beam head-
lamps: move the combination switch back
to its normal position.
The 0057 indicator lamp in the instrument
cluster goes out.
X To switch on the high-beam flasher: turn
the SmartKey to position 1or 2in the igni-
tion lock.
X Pull the combination switch briefly in direc-
tion of arrow 0044. Headlamp range adjustment
The headlamp range control is used to adapt
the downward angle of the headlamp beams
in accordance with the load on your vehicle.
The cone of light from the headlamps changes
if seats are occupied or if the cargo compart-
ment is being loaded or unloaded. This can
impair visibility and cause glare to oncoming
traffic.
You can only adjust the headlamp range while
the engine is running. Exterior lighting
95Lights and windshield wipers Z

X
Turn headlamp range control 0043to the cor-
responding position. The road ahead
should be lit up for 40 mto 100 mand the
low-beam headlamps should not cause
glare to oncoming traffic.
Select position 005Aif the vehicle is unladen. Cornering light function (vehicles
with Bi-Xenon headlamps)
The cornering lamps improve the illumination
of the road over a wide angle in the direction
you are turning, enabling better visibility in
tight bends, for example.
The cornering light function switches on
automatically, if:
R you are traveling at a speed of less than
25 mph (40 km/h) and you switch on a turn
signal or turn the steering wheel.
R you are traveling at a speeds of between
25 mph (40 km/h) and 43 mph (70 km/h)
and turn the steering wheel.
The cornering lamp may remain lit for a short
time, but is automatically switched off after
no more than 3 minute s.
i If reverse gear is engaged the lamp on the
opposite side of the vehicle switches on
instead. Hazard warning lamps
G
WARNING
The rear exterior light will be covered if you:
R open the rear doors by 90°
R open the rear dropside.
The vehicle will then be difficult for other road
users to see or will not be seen by them at all,
particularly if it is dark or visibility is poor.
There is a risk of an accident.
You should therefore ensure in this and simi-
lar situations that the vehicle is visible from
the rear in accordance with the relevant national regulations, by using the warning tri-
angle, for instance. Hazard warning lamp switch
X
To switch on/off: press the002Fhazard
warning lamp switch.
If you have indicated a turn while the hazard
warning lamps are switched on, only the turn
signal lamps on the side of the vehicle
selected will light up.
The hazard warning lamps switch on auto-
matically if:
R an air bag is deployed.
R you brake sharply and bring the vehicle to
a halt from a speed of more than 45 mph
(70 km/h).
If the hazard warning lamps have been
switched on automatically, press the 002F
hazard warning lamp switch to switch them
off.
i The hazard warning lamps work even
when the ignition is switched off. Headlamp cleaning system
The headlamps are cleaned automatically
with a high-pressure water jet if the "Wipe
with washer fluid" function is activated
(Y page 107) while the low-beam headlamps
are on and the engine is running.
Information on checking the washer fluid
level can be found in the "Maintenance and
care" (Y page 257) section. 96
Exterior lightingLights and windshield wipers

R
Do not use a bulb that has been dropped or
that has scratches on its glass tube.
The bulb could may explode.
R Only use bulbs in closed lamps which have
been designed for this purpose.
R Only use spare bulbs of the same type and
with the prescribed voltage
R Protect the bulbs from moisture when in
use.
If the new bulb still does not light up, consult
a qualified specialist workshop.
R Have the LEDs and bulbs of the following
lamps changed at a qualified specialist
workshop:
- the additional turn signals in the exterior
mirrors
- the high-mounted brake lamp
- the Bi-Xenon bulbs
- front fog lamps
If you require assistance changing bulbs, con-
sult a qualified specialist workshop. Front bulbs
Overview of bulb types Lights Bulb type
0043
Additional turn signal
lamp in the exterior mir-
ror (not for all-wheel-
drive vehicles) PY16W
P21W
0044
Halogen headlamps
Turn signal lamps
PY21W Lights Bulb type
Bi-Xenon headlamps
Turn signal lamps
NAK 3457
0087
Halogen headlamps
Navigation lights W5W
Low-beam/high-beam
headlamps H7 55 W
Bi-Xenon headlamps
Low-beam/high-beam
headlamps D3S–35 W
0085
Halogen headlamps
Daytime running lamps
W21W
Bi-Xenon headlamps
Cornering lamps
H7 55 W
0083
Fog lamps H7 55 W
0084
Bi-Xenon headlamps
LED daytime running
lamps
W5W 55 W
Low-beam headlamps and high-beam
headlamps/cornering lamp
X
Switch off the lighting system.
X Open the hood (Y page 250).
X Turn housing cover 0043in the direction of
the arrow and remove it. Changing bulbs
101Lights andwindshield wipers Z

0044
Connector for low-beam headlamps
0087 Connector for high-beam headlamps
0085 Connector for navigation lights (halogen
headlamps)
X Remove corresponding connector 0044,0087
or 0085 from the bulb.
X Detach the locking spring and remove the
bulb.
X Insert the new bulb in such a way that its
base fits into the recess of the bulb holder.
X Attach the locking spring and plug the con-
nector onto the bulb.
X Place housing cover 0043into the opening
and turn in the opposite direction of the
arrow.
X Close the hood.
Cornering light function/daytime run-
ning lamps X
Switch off the lighting system.
X Open the hood (Y page 250).
X Turn housing cover 0043counter-clockwise
and remove it. X
Pull out the bulb holder together with
bulb 0044.
X Pull the bulb out of the bulb holder.
X Press a new bulb into the bulb holder.
X Insert the bulb holder into the lamp.
X Position housing cover 0043and turn it clock-
wise as far as it will go.
X Close the hood.
Turn signal lamps X
Switch off the lighting system.
X Open the hood (Y page 250).
X Turn bulb holder 0043counter-clockwise and
remove it.
X Applying light pressure to the bulb, turn it
counter-clockwise and remove it from bulb
holder 0043.
X Press the new bulb into bulb holder 0043and
screw it in clockwise.
X Insert bulb holder 0043into the lamp and turn
it clockwise to tighten.
X Close the hood. 102
Changing bulbsLights and windshield wipers

Rear bulbs (Cargo Van/Passenger
Van)
Overview of bulb types Lights Bulb type
0043
High-mounted brake
lamp LED
0044
Brake lamps P 21 W
0087
Turn signal lamps PY 21 W
0085
Tail lamps/standing
lamps R 5 W
0083
License plate lamp W 5 W
0084
Rear fog lamps (driver's
side) P 21 W
006B
Backup lamps P 21 W Tail lamps
X
Switch off the lighting system.
X Open the rear door.
X Undo screws 0043and unclip the lamp lens
in the direction of the arrow.
X Pull the connector off the bulb holder. 0044
Retaining lugs
0087 Brake lamps
0085 Turn signal lamps
0083 Standing lamp/tail lamp
0084 Backup lamps
006B Rear fog lamp Changing bulbs
103Lights and windshield wipers Z