Page 410 of 521

409 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
.
Brake lamp
Drive to workshop
Brake lamp illumination is delayed or
lamp is permanently on.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Brake lamp, left
Substitute bulb on
The left brake lamp is malfunctioning. A
substitute bulb is being used.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Brake lamp, right
Substitute bulb on
The right brake lamp is malfunctioning. A
substitute bulb is being used.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Display malfunction
Visit workshop
The display for the lamps or the system is
malfunctioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Front foglamp,
left
The left front fog lamp is malfunctioning.
Replace the bulb as soon as possible.
Front foglamp,
right
The right front fog lamp is malfunctioning.
Replace the bulb as soon as possible.
Active headlamps
currently
unavailable
The active headlamps are malfunctioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Active headlamps
Backup lamp on
The active headlamps are malfunctioning.
Another light is being used.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Active headlamps
malfunction
Drive to workshop
The active headlamps have malfunc-
tioned several times in succession.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Page 411 of 521

410 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
.
High beam,
left
The left high beam lamp is malfunction-
ing.
Replace the bulb as soon as possible.
High beam,
right
The right high beam lamp is malfunction-
ing.
Replace the bulb as soon as possible.
License plate lamp,
left
The left license plate lamp is malfunction-
ing.
Replace the bulb as soon as possible.
License plate lamp,
right
The right license plate lamp is malfunc-
tioning.
Replace the bulb as soon as possible.
Light sensor
Drive to workshop
The lamp sensor is malfunctioning. The
headlamps switch on automatically.
In the control system, set lamp opera-
tion to manual mode (
page 172).
Switch on headlamps using the exteri-
or lamp switch.
Low beam,
left
The left low beam lamp is malfunctioning.
Halogen headlamp:
Replace the bulb as soon as possible.
Bi-Xenon* headlamp:
Visit an authorized Mercedes-Benz
Center as soon as possible.
Backup lamp, left
The left reverse lamp is malfunctioning.
Replace the bulb as soon as possible.
Backup lamp, right
The right reverse lamp is malfunctioning.
Replace the bulb as soon as possible.
Page 412 of 521

411 Practical hints
What to do if …
Display symbol
Display messages
Possible cause/consequence
Possible solution
.
Low beam,
right
The right low beam lamp is malfunction-
ing.
Halogen headlamp:
Replace the bulb as soon as possible.
Bi-Xenon* headlamp:
Visit an authorized Mercedes-Benz
Center as soon as possible.
Front Marker light,
left
The front left side marker lamp is mal-
functioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Front Marker light,
right
The front right side marker lamp is mal-
functioning.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Fr. Park. lamp, left
The left parking lamps are malfunction-
ing.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Fr. Park. lamp, right
The right parking lamps are malfunction-
ing.
Visit an authorized Mercedes-Benz
Center as soon as possible.
Rear foglamp
Substitute bulb on
The rear fog lamp is malfunctioning. A
substitute bulb is being used.
Replace the bulb as soon as possible.
Switch off lamps
Lamps have been turned on although the
SmartKey in the starter switch is in posi-
tion 0.
Switch off the headlights.
Page 432 of 521
431 Practical hints
Replacing bulbs
Replacing bulbs
Bulbs
Safe vehicle operation depends on proper
exterior lighting and signaling. It is there-
fore essential that all bulbs and lamp as-
semblies are in good working order at all
times.
Correct headlamp adjustment is extremely
important. Have headlamps checked and
readjusted at regular intervals and when a
bulb has been replaced. See your autho-
rized Mercedes-Benz Center for headlamp
adjustment.
iIf the headlamps or front fog lamps are
fogged up on the inside as a result of
high humidity, driving the vehicle a dis-
tance with the lights on should clear up
the fogging.
iSubstitute bulbs will be brought into
use when lamps malfunction. Read and
observe messages in the multifunction
display (
page 409).
Page 433 of 521
432 Practical hintsReplacing bulbs
Front lamps Rear lamps
Lamp
Type
1
Additional turn signal
lamp
LED
2
Turn signal lamp
1156 NA
3
Side marker lamp
W 5 W
4
Halogen headlamp:
Low beam
Bi-Xenon* headlamp:
Low and high beam
1
1Vehicles with Bi-Xenon* headlamps: Low beam
and high beam use the same D2S-35W lamp. Do
not replace the Bi-Xenon bulbs yourself. Contact
your authorized Mercedes-Benz Center.
H7 (55 W)
D2S-35 W
5
Halogen headlamp:
High beam/high beam
flasher
Bi-Xenon* headlamp:
High beam flasher
H7 (55 W)
H7 (55 W)
Parking and standing
lamp
W 5 W
6
Front fog lamp
H1 (55 W)
Lamp
Type
7
High mounted brake
lamp
LED
8
Brake, tail, parking,
standing, backup lamp
and turn signal lamp.
Rear fog lamp (only
driver’s side)
HiP
LED*
9
License plate lamps
C 5 W
Page 434 of 521

433 Practical hints
Replacing bulbs
Notes on bulb replacement
Only use 12-volt bulbs of the same type
and with the specified watt rating.
Switch lights off before changing a bulb
to prevent short circuits.
Always use a clean lint-free cloth when
handling bulbs.
Your hands should be dry and free of oil
and grease.
If the newly installed bulb does not light
up, visit an authorized Mercedes-Benz
Center.
Have the LEDs and bulbs for the follow-
ing lamps replaced by an authorized
Mercedes-Benz Center:
Additional turn signals in the exteri-
or rear view mirrors
High mounted brake lamp
Bi-Xenon* lamps
Front fog lamps
Rear lamps (except license plate
lamps)
Front side marker lamps
Warning!
G
Bulbs and bulb sockets can be very hot. Al-
low the lamp to cool down before changing
a bulb.
Keep bulbs out of reach of children.
Halogen lamps contain pressurized gas. A
bulb can explode if you:
touch or move it when hot
drop the bulb
scratch the bulb
Wear eye and hand protection.
Because of high voltage in Bi-Xenon* lamps,
it is dangerous to replace the bulb or repair
the lamp and its components. We recom-
mend that you have such work done by a
qualified technician.
iHave the headlamp adjustment
checked regularly.
Page 435 of 521

434 Practical hintsReplacing bulbsReplacing bulbs for front lamps
1Housing cover for low beam halogen or
Bi-Xenon* headlamp2Bulb socket for high beam head-
lamp/high beam flasher bulb
3Bulb socket for parking and standing
lamp bulb
4Bulb socket for low beam headlamp
bulb (halogen headlamps only)
5Bulb socket for turn signal lamp bulb
Before you start to replace a bulb for a
front lamp, do the following first:
Turn the exterior lamp switch to
positionM (
page 143).
Open the hood (
page 315).Low beam bulb (halogen headlamps
only)
Turn housing cover1 counterclock-
wise and remove it.
Turn bulb socket4 with the bulb
counterclockwise and remove it.
Pull the bulb out of bulb socket4.
Press the new bulb gently into bulb
socket4.
Place bulb socket5 back into the
lamp and turn it clockwise until it en-
gages.
Align housing cover1 and turn it
clockwise until it engages.
Warning!
G
Do not remove the cover1 for the
Bi-Xenon* headlamp. Because of high
voltage in Bi-Xenon* lamps, it is dangerous
to replace the bulb or repair the lamp and its
components. We recommend that you have
such work done by a qualified technician.
Page 436 of 521

435 Practical hints
Replacing bulbs
High beam bulb/high beam flasher
bulb (halogen headlamps)/high beam
flasher bulb (Bi-Xenon* headlamps)
Turn bulb socket2 with the bulb
counterclockwise and remove it.
Pull the bulb out of bulb socket2.
Press the new bulb gently into bulb
socket2.
Place bulb socket2 back into the
lamp and turn it clockwise until it en-
gages.Front turn signal lamp bulb
Turn bulb socket5 with the bulb
counterclockwise and remove it.
Press gently onto the bulb and turn
counterclockwise out of bulb
socket5.
Press the new bulb gently into bulb
socket5 and turn clockwise until it
engages.
Place bulb socket5 back into the
lamp and turn it clockwise until it en-
gages.
Parking and standing lamp bulb
Turn bulb socket3 with the bulb
counterclockwise and remove it.
Pull the bulb out of bulb socket3.
Press the new bulb gently into bulb
socket3.
Place bulb socket3 back into the
lamp and turn clockwise until it engag-
es.Additional turn signal lamp bulbs
The additional turn signal lamps in the
exterior rear view mirrors have LEDs.
If a malfunction occurs or LEDs fail to func-
tion, the entire turn signal unit must be re-
placed. Have the turn signal unit replaced
by an authorized Mercedes-Benz Center.
Front side marker lamp bulbs
Since replacing the side marker lamp bulbs
is a technically highly demanding process,
we recommend you have the side marker
lamp bulbs replaced by an authorized
Mercedes-Benz Center.