Page 383 of 481

382 Practical hintsWhat to do if …Display symbol
Display message
Possible cause/consequence
Possible solution
.
3rd brake light
The high mounted brake lamp is
malfunctioning. This message will
only appear if a critical number of
LEDs have stopped working.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Tail lamp / brake lamp
left
Back-up lamp on
The left tail lamp/brake 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.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Tail lamp / brake lamp
right
Back-up lamp on
The right tail lamp/brake 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.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Brake lamp
Visit workshop
Brake lamp illumination is delayed
or lamp is permanently on.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Front foglamp, L
The left front fog lamp is malfunc-
tioning.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Front foglamp, R
The right front foglamp is malfunc-
tioning.
Visit an authorized Mercedes-Benz Center
as soon as possible.
Page 384 of 481

383 Practical hints
What to do if …
.
Rear foglamp
Back-up lamp on
The 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.
High beam, left
The left high beam lamp (halogen
headlamps)/high beam flasher
lamp (Bi-Xenon* headlamps) is mal-
functioning.
Replace the bulb as soon as possible.
High beam, right
The right high beam lamp (halogen
headlamps)/high beam flasher
lamp (Bi-Xenon* headlamps) is mal-
functioning.
Replace the bulb as soon as possible.
Lamp sensor
Drive to workshop
The light sensor is malfunctioning.
The headlamps switch on automati-
cally.
In the control system, set lamp operation to
manual (
page 143).
Switch on headlamps using the exterior
lamp switch (
page 110).
Visit an authorized Mercedes-Benz Center
as soon as possible.
Left license plate
lamp malfunction
The left license plate lamp is mal-
functioning.
Replace the bulb as soon as possible.
Right license plate
lamp malfunction
The right license plate lamp is mal-
functioning.
Replace the bulb as soon as possible.
Display symbol
Display message
Possible cause/consequence
Possible solution
Page 401 of 481
400 Practical hintsReplacing bulbsSafe 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 an authorized
Mercedes-Benz Center for headlamp ad-
justment.
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. Observe the
messages in the multifunction display
(page 382).
Page 403 of 481

402 Practical hintsReplacing 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
come on, visit an authorized
Mercedes-Benz Center.Have the LEDs and bulbs for the following
lamps replaced by an authorized
Mercedes-Benz Center:
Additional turn signal lamps in the
exterior rear view mirrors
Bi-Xenon* lamps
Front fog lamps
High mounted brake lamp
Brake lamps
Front and rear side marker lamps
Parking/standing lamps in the tail
lamp assemblies
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.
iHave the headlamp adjustment
checked regularly.