Page 376 of 473

375 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
OYou are driving with the hood open.Risk of accident!
Stop the vehicle in a safe location or as soon
as it is safe to do so.
Apply the parking brake (page 59).
Close the hood (page 294).
IPlease
get a new keyThe SmartKey is malfunctioning.Contact an authorized Mercedes-Benz
Center.
Remove keyYou have forgotten to remove the
SmartKey from the starter switch.Remove the SmartKey from the starter
switch.
.3rd brake lampThe high mounted brake lamp is
malfunctioning. This message will
only appear if a critical number of
LEDs have stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.
AUTO-Light
inoperativeThe light sensor is malfunctioning.
The headlamps switch on automati-
cally.Contact an authorized Mercedes-Benz
Center as soon as possible.
To switch off the headlamps (U.S. vehicles only):
In the control system, set lamp operation to
manual mode (
page 143).
Switch off headlamps using the exterior
lamp switch (
page 109).
Page 377 of 473

376 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
.Brake-/tail lamp
leftThe left brake lamp is malfunction-
ing. This message will only appear if
a critical number of LEDs have
stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.
Brake-/tail lamp
rightThe right brake lamp is malfunction-
ing. This message will only appear if
a critical number of LEDs have
stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.
Front foglamp
leftThe left front fog lamp is malfunc-
tioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Front foglamp
rightThe right front foglamp is malfunc-
tioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Rear foglamp
Auxiliary bulb onThe rear fog lamp on the driver’s
side is malfunctioning. A backup
bulb has been brought into use.Replace the bulb as soon as
possible (
page 393).
High beam
leftThe left high beam lamp (halogen
headlamps)/high beam flasher
lamp (Bi-Xenon* headlamps) is
malfunctioning.Replace the bulb as soon as
possible (
page 393).
Page 378 of 473
377 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
.High beam
rightThe right high beam lamp (halogen
headlamps)/high beam flasher
lamp (Bi-Xenon* headlamps) is
malfunctioning.Replace the bulb as soon as
possible (
page 393).
License plate lamp
leftThe left license plate lamp is
malfunctioning.Replace the bulb as soon as
possible (
page 393).
License plate lamp
rightThe right license plate lamp is
malfunctioning.Replace the bulb as soon as
possible (
page 393).
Reverse lamp
leftThe left backup lamp is malfunc-
tioning.Replace the bulb as soon as
possible (
page 393).
Reverse lamp
rightThe right backup lamp is malfunc-
tioning.Replace the bulb as soon as
possible (
page 393).
Low beam
leftThe left low beam lamp is malfunc-
tioning.Halogen headlamp:
Replace the bulb as soon as
possible (
page 393).
Bi-Xenon* headlamp:
Contact an authorized Mercedes-Benz
Center as soon as possible.
Page 379 of 473

378 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
.Low beam
rightThe right low beam lamp is malfunc-
tioning.Halogen headlamp:
Replace the bulb as soon as
possible (
page 393).
Bi-Xenon* headlamp:
Contact an authorized Mercedes-Benz
Center as soon as possible.
Parking lamp, front left
Auxiliary bulb onThe left front parking lamp is
malfunctioning. A backup bulb has
been brought into use.Replace the bulb as soon as
possible (
page 393).
Parking lamp, front right
Auxiliary bulb onThe right front parking lamp is
malfunctioning. A backup bulb has
been brought into use.Replace the bulb as soon as
possible (
page 393).
Front left
marker lampThe left front side marker lamp is
malfunctioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Front right
marker lampThe right front side marker lamp is
malfunctioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Rear left
marker lampThe left rear side marker lamp is
malfunctioning. This message will
only appear if a critical number of
LEDs have stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.
Page 380 of 473

379 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
.Rear right
marker lampThe right rear side marker lamp is
malfunctioning. This message will
only appear if a critical number of
LEDs have stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.
Tail lamp, left
Auxiliary bulb onThe left tail lamp is malfunctioning.
This message will only appear if a
critical number of LEDs have
stopped working. A backup bulb
has been brought into use.Contact an authorized Mercedes-Benz
Center as soon as possible.
Tail lamp, right
Auxiliary bulb onThe right tail lamp is malfunction-
ing. This message will only appear if
a critical number of LEDs have
stopped working. A backup bulb
has been brought into use.Contact an authorized Mercedes-Benz
Center as soon as possible.
Turn off
lightsYou have removed the SmartKey
from the starter switch, opened the
driver’s door and left the headlamps
on.Switch off the headlamps (page 61).
Turn off lights or
remove keyThe exterior lamp switch is set to
positionU, and you have forgot-
ten to remove the SmartKey from
the starter switch. The parking
lamps remain switched on.Switch off the headlamps (page 61).
or
Remove the SmartKey from the starter
switch.
Page 394 of 473

393 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
assemblies 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. Contact an
authorized Mercedes-Benz Center for
headlamp adjustment.
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 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.
iIf the headlamps are fogged up on the inside
as a result of high humidity, driving the vehicle a
short distance with the lights on should clear up
the fogging.
iBackup bulbs will be brought into use
when lamps malfunction. Read and observe
the messages in the multifunction
display (
page 375).
Page 395 of 473
394 Practical hints
Replacing bulbs
Front lamps
LampType
1Additional turn signal
lampLED
2Turn signal lamp3457 AK
3Halogen headlamp:
Low beam
H7 (55 W)
Bi-Xenon* headlamp:
Low and high beam1
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
an authorized Mercedes-Benz Center.
D2S-35 W
4Front fog lampHB4 (51 W)
Front fog lamp
(vehicles with Sport
Package* and
SLK 55 AMG)H7 (55 W)
Corner illuminating
front fog lamp*H7 (55 W)
LampType
5Parking and standing
lampW5W
6Halogen headlamp:
High beam/high beam
flasher
H7 (55 W)
Bi-Xenon* headlamp:
High beam flasher
H7 (55 W)
7Side marker lampW5W
Page 397 of 473
396 Practical hints
Replacing bulbs
Replacing bulbs for front lamps
Before you start to replace a bulb for a
front lamp, do the following first:
Turn the exterior lamp switch to
positionM (
page 109).
Open the hood (page 294).
1Housing cover for low beam (halogen
headlamps only)
Housing cover for Bi-Xenon* head-
lamps. Do not remove.
2Bulb socket for turn signal lamp
3Bulb socket for high beam/high beam
flasher lamp
4Bulb socket for parking and standing
light lamp
5Bulb socket for low beam bulb
(Halogen headlamps only)
Warning!G
Do not remove the cover1 for the
Bi-Xenon* headlamp. Because of high volt-
age 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.