Page 77 of 305

Lights and visibility
Control lampsIt lights upPossible causeSolution
Driving light totally
or partially faulty.
Replace the corre-
sponding bulb
››› page 266.
If all the bulbs are
OK, the vehicle
should be taken to
a specialised work-
shop if necessary.
Fault in adaptive
light.››› page 77.
Rear fog light
switched on.
›››
page 75. Front fog lights
switched on
Left or right turn
signal.
The control lamp
flashes twice as
fast when a vehicle
or trailer turn signal
is faulty.
If necessary, check
the vehicle and
trailer lighting.
Main beam on or
flasher on.›››
page 76.
Headlight adjust-
ment (Light Assist)
on.›››
page 76.
FlashesPossible causeSolution
Fault in the adap-
tive light system.Contact a special-
ised workshop
››› page 76. Several warning and control lamps light up
for a few seconds when the ignition is switch-
ed on, signalling that the function is being
verified. They will switch off after a few sec-
onds.
WARNING
Observe the safety warnings ››› in Control
and warning lamps on page 47. Turning lights on and off
Fig. 60
Next to the steering wheel: diagram
of some of the types of light switch The legal requirements regarding the use of
vehicle lights in each country must be ob-
served.
In vehicles with
tow hitch fitted as standard:
if the trailer is connected electrically and is
fitted with a rear fog light, the vehicle’s fog
light is automatically switched off.
Turn the light switch to the required position
››› Fig. 60 :
When the igni-
tion is switched
offWhen the ignition
is on
Fog lights, dipped
beam and side
lights off.Lights off or daytime
driving light on.
The guidance lights
may be switched
on.Automatic dipped
beam control or day-
time driving light on.
Side light on.Side light on.
Dipped beam off; if
necessary, the side
light comes on for a
time.Dipped beam switch-
ed on.
Fog lights
The warning lamps
or on the light
switch also indicate that the fog lights are
switched on. »
75
Technical specifications
Advice
Operation
Safety
Page 269 of 305

Fuses and bulbs
WARNING
Failure to replace bulbs correctly may cause
serious accidents.
● Before carrying out any work in the engine
compartment please read and observe the
warnings ››› page 214. In any vehicle, the en-
gine c omp
artment is a hazardous area and
could cause severe injury.
● Discharge lamps work with high-voltage
and can cause serious or fatal injury if han-
dled incorrectly.
● H7 and discharge lamps are highly pressur-
ised and could explode when being changed.
● Only replace the bulbs concerned when
they have cooled.
● Never replace bulbs alone if you are not fa-
miliar with the operations necessary. If you
are not sure about procedures then visit a
specialised workshop to carry out the neces-
sary work.
● Never touch the bulb glass directly. Finger-
prints will be evaporated by the heat of the
operating bulb thus “fogging” up the reflec-
tor.
● The headlamp frameworks in the engine
compartment and the tail lamps contain sharp elements. Always protect your hands
when changing bulbs.
CAUTION
● After changing a bulb, if the rubber covers
are not replaced correctly on the headlamp
framework, the electrical installation may be
damaged, especially if water is allowed to en-
ter.
● Remove the ignition key before working on
the electric system. Otherwise, a short circuit
could occur.
● Switch off the lights and the parking light
before changing a bulb.
● Take good care to avoid damaging any com-
ponents. Control lamp
It
lights upPossible causeSolution
A vehicle exterior
lighting bulb is not
working.Replace the faulty
bulb. Several warning and control lamps light up
for a few seconds when the ignition is switch-
ed on, signalling that the function is being
verified. They will switch off after a few sec-
onds.
Checking the bulbs of a trailer
For vehicles with the factory fitted towing
bracket, certain trailer lights are also control-
led if the power socket is correctly connected.
A fault on a trailer turn signal is indicated on
the instrument panel by the turn signal blink-
ing twice as fast (
or ) ››› page 74.
● General fault of all turn signals on one side.
● Fault in one tail light (on some models, al-
so the registration light).
● Fault in two brake lights. WARNING
Observe the safety warnings ››› in Control
and warning lamps on page 47. Note
A fault in the LED on the tail lights will not be
indicated. However, if the fault affects all the
LEDs then this will be indicated by the control
lamp . 267
Technical specifications
Advice
Operation
Safety
Page 270 of 305

Advice
To replace halogen headlight bulbs Fig. 211
In the engine compartment: left-
hand side headlight lining. A dipped beam
headlights, B daytime driving lights and
Cmain beam headlights and side lights Fig. 212
Left headlight. There is no need to remove the headlight to
replace bulbs.
Complete operations only in the sequence
given:
ABC
Turn signals (small lamp holder)Dipped beam
headlightsDaytime driving lightMain beam headlightsSide lights
1.Open the bonnet ››› page 214.
2. Remove the rubber cover on the rear of the headlight.
3.Rotate the lamp holder 1 to the left
all the way and pull it out backwards with the bulb.Rotate the lamp holder to the left all the wayand pull it out backwards with the bulb.Press the wire clip downwards and
pull the lamp holder 2 out with the
bulb.Pull the lamp holder 3 out back-
wards with the bulb.
4.Depending on the model, the bulb is removed directly from the lamp holder or it may need to be rotated and then removed.
5.Replace the faulty bulb by a new identical bulb. 268
Page 271 of 305

Fuses and bulbs
ABC
Turn signals (small lamp holder)Dipped beam
headlightsDaytime driving lightMain beam headlightsSide lights
6.Place the bulb holder in the headlight and rotate to the right all the way.Place the lamp holder in the head-
light and pull the wire clip upwards until it clicks into place.Place the lamp holder in the head-light and insert completely.
7. Insert the rubber cover. Note
The images show the left hand headlight
from behind. The structure of the right hand
side headlight is symmetric. To replace the xenon headlights bulb
Fig. 213
In the engine compartment: turn sig-
nal indicator cover. Fig. 214
Turn signal lamp holder 1 and turn-
ing light 2 There is no need to remove the headlight to
replace bulbs.
Complete operations only in the sequence
given:
Turn signals
1Turning lights 2
1.Open the bonnet
››› page 214.
2.Rotate the cover ››› Fig. 213 in the direction of the
arrow and remove it.
Turn signals 1Turning lights 2
3.
Rotate the lamp holder
1 ››› Fig. 214 to the
left all the way and pull
it out backwards with
the bulb.Press the wire clip
downwards and pull the
lamp holder 2
›››
Fig. 214 out with the
bulb.
4.Depending on the model, the bulb is removed di-
rectly from the lamp holder or it may need to be ro- tated and then removed.
5.Replace the faulty bulb by a new identical bulb.
6.
Place the bulb holder in
the headlight and ro-
tate to the right all the
way.Place the lamp holder
in the headlight and
pull the wire clip up-
wards until it clicks into
place.
7.Rotate the cover ››› Fig. 213 in the opposite direc-
tion to the arrow as far as it will go. Always seek the help of a specialist when
changing the Xenon dipped beam and main
beam headlamps
››› in Introduction on
page 267. »
269
Technical specifications
Advice
Operation
Safety