Page 377 of 456

376 Practical hintsReplacing SmartKey batteriesIf the batteries in the SmartKey or the
SmartKey with KEYLESS-GO* are dis-
charged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an autho-
rized Mercedes-Benz Center.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.
SmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key out of the
SmartKey (
page 372).1Mechanical key
2Slide
3Battery compartment
Insert mechanical key1 in the direc-
tion of arrow in side opening.
Using mechanical key1, push gray
slide 2 to unlatch battery compart-
ment 3.
Pull battery compartment3 out of the
housing in the direction of arrow.
Warning!
G
Batteries contain poisonous and corrosive
substances. Therefore keep the batteries
out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen inserting the batteries, make
sure they are clean and free of lint.iThe required replacement batteries are
available at any authorized
Mercedes-Benz Center.iWhen changing batteries, always re-
place both batteries.
Page 378 of 456

377 Practical hints
Replacing SmartKey batteries
4Battery
5Contact spring
Remove the batteries4 in the direc-
tion of arrow.
Using a lint-free cloth, insert new
batteries4 under the contact
spring5 with the positive terminal (+)
side facing up.
Return battery compartment3
(page 376) into housing until it locks
into place.
Slide mechanical key1 (
page 372)
back into the SmartKey.
Check the operation of the SmartKey.
SmartKey with KEYLESS-GO*
Replacement battery: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key out of the
SmartKey with KEYLESS-GO
(page 372).
Remove battery compartment3 out
of the housing (
page 376).
1Battery
2Tilt battery up
3Mechanical key
Using mechanical key3, apply pres-
sure to position2.
Battery1 tilts up slightly.
Pull out battery1 in the direction of
arrow.
Using a lint-free cloth, insert new
battery1 with the plus (+) side facing
up.
Return battery compartment3
(page 376) into housing until it locks
into place.
Slide mechanical key1 (
page 376)
back into the SmartKey with
KEYLESS-GO.
Check the operation of KEYLESS-GO.
Page 379 of 456
378 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 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 the following lamps malfunc-
tion:
Brake lamps
Rear parking lamps
Rear turn signal lamps
Tail lamps
Observe the messages in the multi-
function display (
page 354).
Page 380 of 456
379 Practical hints
Replacing bulbs
Bulbs Front lamps Rear lamps
Lamp
Type
1
Additional turn sig-
nal lamp
LED
2
Turn signal lamp
1156 NA
3
High beam flasher
H7-55 W
4
Side marker lamp
W5W
5
Fog lamp
HB4-55 W
6
Parking and stand-
ing lamp
W5W
7
Low beam and high
beam lamp
Xenon
1
D2S-35 W
1Bi-Xenon headlamps: For safety reasons (high volt-
age), do not replace the Xenon bulb yourself. Con-
tact your authorized Mercedes-Benz Center.
Lamp
Type
8
High mounted brake
lamp
LED
9
Brake lamp
LED
a
Tail, parking and
standing lamp
P21/4W
Side marker lamp
LED
b
Backup lamp
P21W
c
License plate lamp
C5W
d
Rear fog lamp,
driver’s side
P 21/4 W
e
Turn signal lamp
PY 21 W
Page 381 of 456

380 Practical hintsReplacing bulbsNotes 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 exte-
rior rear view mirrors
Bi-Xenon lamps
High mounted brake lamp
Brake lamps
Front side marker lamps
Rear side marker lamps
Rear parking lamps
Warning!
G
Keep bulbs out of reach of children.
Bulbs and bulb sockets can get very hot. Al-
low the lamp to cool down before changing
a bulb.
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.
Page 382 of 456
381 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 M
(page 52).
Open the hood (
page 273) (except
for side marker lamps).
1Housing cover for high beam flasher
bulb, parking and standing lamp2Electrical connector for high beam
flasher housing bulb
3Bulb socket for parking and standing
lamp
4Bulb socket for turn signal lamp
5Housing cover for Bi-Xenon headlampBi-Xenon headlamp
Warning!
G
Do not remove the cover for the Bi-Xenon
headlamp. Because of high voltage in Xenon
lamps, it is dangerous to replace the bulb or
repair the lamp and its components. We rec-
o mm e nd that y ou ha ve s uc h wo rk do ne b y a
qualified technician.
Page 383 of 456

382 Practical hintsReplacing bulbsHigh beam flasher bulb
Press ends of housing cover1 tab to-
gether and remove cover.
Press connector2 downward.
Remove connector2 with the bulb.
Insert the new bulb so that the base lo-
cates in the recess on the holder.
From below, press connector2 with
bulb upward onto the reflector.
Align housing cover1 and click into
place.
Front turn signal bulb
Turn bulb socket4 counterclockwise
and pull out.
Gently push bulb into bulb socket4,
turn counterclockwise and remove.
Insert new bulb in bulb socket4, push
in and twist clockwise.
Reinsert bulb socket4 in lamp and
twist clockwise.Parking and standing lamp bulb
Press ends of housing cover1 tab to-
gether and remove cover.
Pull out the bulb socket3 with the
bulb.
Pull the bulb out of the bulb socket3.
Insert a new bulb in the socket3.
Reinstall the bulb socket3.
Align housing cover1 and click into
place.
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.
Replacing bulbs for rear lamps
Before you start to replace a bulb for a
front lamp, do the following first:
Turn the exterior lamp switch to M
(page 52).
Open the trunk (
page 101).
Page 384 of 456
383 Practical hints
Replacing bulbs
Tail lamp assembliesPassenger side1Black socket:
Backup lamp
2Red socket:
Driver’s side: Tail, parking and rear fog
lamp
Passenger’s side: Tail and parking lamp
3Red socket:
Tail, standing and parking lamp
4White socket:
Turn signal lamp
Turn the locking knob and move the
trim to the side.
Turn bulb socket counterclockwise and
pull out.
Gently twist bulb counterclockwise and
pull out of bulb holder.
Insert new bulb into the holder and turn
it clockwise.
Reinstall bulb socket.
The bulb socket should audibly click.
Replace trim and secure with lock. License plate lamp
1Screws
Loosen both screws1.
Remove the license plate lamp.
Replace the bulb.
Reinstall the license plate lamp.
Retighten screws1.