Page 275 of 401

Display
messages 272 Display messages Possible cause/consequence Possible solution
B Top up coolant See
Owner's Manual The coolant level is too low. X
Top up the coolant, observing the warning
notes before doing so (Y page 225).
X Have the coolant system checked at a qualified
specialist workshop if the coolant needs top-
ping up more often than usual. . Left-hand corner-
ing light
or
Right-hand corner-
ing light The left-hand and/or right-hand cornering
lamp* is faulty. X
Visit a qualified specialist workshop. . Dipped beam, left
or
Dipped beam, right The right-hand or left-hand dipped-beam
headlamp is faulty. X
Halogen headlamp: replace the bulb
(Y page 311).
X Bi-xenon headlamp*: visit a qualified special-
ist workshop. . Left-hand trailer
turn signal
or
Right-hand trailer
turn signal The left-hand or right-hand trailer turn sig-
nal is faulty. X
Replace the bulb. . Trailer brake lamp The trailer brake lamp is faulty. X
Replace the bulb. Practical advi
ce
* optional
211_AKB; 2; 5, en-GB
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Page 276 of 401

Display
messages 273Display messages Possible cause/consequence Possible solution
. Trailer Left-hand
tail lamp
or
Trailer Right-hand
tail lamp The left-hand or right-hand trailer tail lamp
is faulty. X
Replace the bulb. . AUTO lights inop-
erative The light sensor is faulty. Constant head-
lamp mode is switched on. X
Switch the lights to manual control in the on-
board computer (Y page 135).
X Switch the lights on and off using the light
switch. . Rear left turn sig-
nal Back-up bulb on
or
Rear right turn
signal Back-up
bulb on The rear left-hand or rear right-hand turn
signal is faulty. X
Visit a qualified specialist workshop. . Turn signal in
left-hand mirror
or
Turn signal in
right-hand mirror The turn signal lamp on the left-hand or
right-hand exterior mirror is faulty. This
display message will only appear if all
LEDs have failed. X
Visit a qualified specialist workshop. Practical advi
ce
211_AKB; 2; 5, en-GB
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Page 277 of 401

Display
messages 274 Display messages Possible cause/consequence Possible solution
. Front left turn
signal Back-up
bulb on
or
Front right turn
signal Back-up
bulb on The front left-hand or right-hand turn sig-
nal is faulty. X
Replace the bulb (Y page 311). . 3rd brake lamp The third brake lamp is faulty. This display
message will only appear if all LEDs have
failed. X
Visit a qualified specialist workshop. . Left brake-/tail
lamp Back-up bulb
on
or
Right brake-/tail
lamp Back-up bulb
on The left-hand or right-hand rear brake
lamp is faulty. This display message will
only appear if all LEDs have failed.* X
Visit a qualified specialist workshop. . Main beam, left
or
Main beam, right The left-hand or right-hand main-beam
headlamp is faulty. X
Replace the bulb (Y page 311). . Intell. Light Sys-
tem inoperative
The Intelligent Light System* is faulty. The
lights remain available without the Intelli-
gent Light System*. X
Visit a qualified specialist workshop. Practical advi
ce
* optional
211_AKB; 2; 5, en-GB
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Page 302 of 401

Troubleshooting
299Headlamps and turn signals
Problem Possible cause/consequence Suggested solutions
The headlamps or the turn signals
in the exterior mirrors are misted
up on the inside. Air humidity is very high. X
Drive with the headlamps switched on.
The headlamps are demisted after a short distance. The headlamp housing is not
sealed and moisture has been
able to enter. X
Have the headlamps checked at a qualified specialist workshop. Windscreen wipers
Problem Possible cause/consequence Suggested solutions
The windscreen wipers are jam-
med. Leaves or snow, for example, may
be obstructing the windscreen
wiper movement. The wiper
motor has been deactivated. X
For safety reasons, you should remove the key from the ignition
lock.
X Remove the cause of the obstruction.
X Switch the windscreen wipers back on. The windscreen wipers fail com-
pletely. The windscreen wiper drive is
malfunctioning. X
Select another wiper speed on the combination switch.
X Have the windscreen wipers checked at a qualified specialist work-
shop. Practical advice
211_AKB; 2; 5, en-GB
mkalafa
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Page 316 of 401

Changing the bulbs
313
Front bulbs Bulb Type
1 Additional turn
signal lamp
LEDs
35 2 Turn signal lamp PY 21 W
3 Dipped-beam
headlamp
H7 55 W
36
or
D1S 35 W* 37 4 Main-beam
headlamp H7 55 W
Side lamp/park-
ing lamp W 5 W
or
LED*
35 5 Front foglamp
H11 55 W
35 Rear bulbs
Bulb Type
6 Third brake
lamp
LED
35 7 Rear foglamp
HiP
35 Side lamp/park-
ing lamp
HiP
35 Reversing lamp
HiP
35 Brake lamp
HiP
35
or
LED* 35 Turn signal lamp
HiP
35 8 Licence plate
lamp C 5 W Before changing bulbs
You can replace the following bulbs:
R
Dipped-beam headlamps (vehicles with
halogen headlamps)
R Main-beam headlamp
R Replacing the bulb in the side lamp/park-
ing lamp (vehicles with halogen headlamps)
R Turn signal lamp (front)
R Licence plate lamp
Observe the following points:
R Use only the bulb types specified here.
R To prevent a short-circuit, switch off the
lights before changing a bulb.
R Only hold bulbs with a clean, lint-free cloth.
R Do not work with wet or greasy fingers.
R If the new bulb still does not light up, con-
sult a qualified specialist workshop, e.g. a
Mercedes-Benz Service Centre.
i Have the headlamp setting checked reg-
ularly at a qualified specialist workshop,
e.g. a Mercedes-Benz Service Centre.
35 These bulbs must be replaced at a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
36 Vehicles with halogen headlamps.
37 Vehicles with xenon headlamps*: always have these bulbs changed at a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre. Practical advice
* optional
211_AKB; 2; 5, en-GB
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Page 317 of 401

Changing the bulbs
314 Changing the front bulbs
Halogen or bi-xenon* headlamps
1
Bulb holder for turn signal
2 Bulb holder for main-beam headlamp
3 Bulb holder for side/parking lamp
4 Housing cover for dipped-beam headlamp
(halogen/bi-xenon headlamps)
Replacing dipped-beam headlamps
(vehicles with halogen headlamps) X
Switch off the lights.
X Open the bonnet.
X Turn housing cover 4anti-clockwise and
remove it.
X Turn the bulb holder anti-clockwise until it
is released. X
Pull out the bulb holder.
X Change the bulb.
X Insert the bulb holder into the headlamp
and turn it clockwise until it engages.
X Place housing cover 4back on and turn it
clockwise until it engages.
Replacing the bulbs in the main-beam
headlamp X
Switch off the lights.
X Open the bonnet.
X Turn bulb holder 2anti-clockwise and
remove it together with the bulb.
X Pull the bulb out of bulb holder 2.
X Insert the new bulb into bulb holder 2.
X Insert bulb holder 2into the headlamp
and turn it clockwise until it engages.
Replacing the bulb in the side lamp/
parking lamp (vehicles with halogen
headlamps) X
Switch off the lights.
X Open the bonnet. X
Turn bulb holder 3anti-clockwise and pull
it out.
X Pull the bulb out of bulb holder 3.
X Insert the new bulb into bulb holder 3.
X Insert bulb holder 3into the headlamp
and turn it clockwise until it engages.
Replacing the bulbs in the turn signal
lamps X
Switch off the lights.
X Open the bonnet.
X Turn bulb holder 1anti-clockwise and
remove it along with the bulb.
X Turn the bulb anti-clockwise, applying
slight pressure, and remove it from bulb
holder 1.
X Insert the new bulb into bulb holder 1and
turn it clockwise.
X Insert bulb holder 1into the headlamp
and turn it clockwise until it engages. Practical advice
* optional
211_AKB; 2; 5, en-GB
mkalafa,
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