Page 377 of 457

376 Practical hints
Replacing SmartKey batteries
If the batteries in the SmartKey are
discharged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an autho-
rized Mercedes-Benz Light Truck 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.Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key from the
SmartKey (
page 370).
1Mechanical key
2Slide
3Battery compartment
Insert mechanical key1 in direction
of the arrow in side opening.
Using mechanical key1, push gray
slide2 to unlatch battery
compartment3.
Pull battery compartment3 out of the
housing in direction of the arrow.4Battery
5Contact spring
Remove discharged batteries4 in
direction of the arrow.
Using a lint-free cloth, insert new
batteries under contact spring5 with
the positive terminal (+) facing up.
Return battery compartment3 into
the housing until it locks into place.
Slide mechanical key1 back into the
SmartKey.
Check the operation of the SmartKey.
Warning!G
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.
iWhen replacing batteries, always replace
both batteries.
The required replacement batteries are available
at any Mercedes-Benz Light Truck Center.
Page 378 of 457
377 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. See an authorized
Mercedes-Benz Light Truck 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 distance with the
lights on should clear up the fogging.iSubstitute bulbs will be brought into use
when the following lamps malfunction:
Turn signal lamps
Tail lamps
Parking lamps
Rear fog lamp
Read and observe the messages in the
multifunction display (
page 354).
Page 379 of 457
378 Practical hints
Replacing bulbs
Front lamps Rear lamps
LampType
1Additional turn signal
lampLED
2Locator lighting lampW6W
3Turn signal lamp1156 NA
4Side marker lampT4W
5Bi-Xenon headlamp:
Low and high beam1
1Bi-Xenon headlamp: Low beam and high beam use
the same D1S-35 W lamp. Do not replace the
Bi-Xenon bulbs yourself. Contact an authorized
Mercedes-Benz Light Truck Center.
D1S-35 W
Parking and standing
lampW5W
Blue vision
6Front fog lampH11 (55 W)
LampType
7High mounted brake
lampLED
8Turn signal lampPY 21 W
Brake and tail lampP21/5W
Tail, parking and
standing lampW5W
9Backup lampP21W
aLicense plate lampsC5W
bRear fog lampP21W
cSide marker lampT4W
Page 380 of 457

379 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
come on, contact an authorized
Mercedes-Benz Light Truck Center.Have the LEDs and bulbs for the following
lamps replaced at an authorized
Mercedes-Benz Light Truck Center:
the additional turn signal lamps in the
exterior rear view mirrors
the high mounted brake lamp
the Bi-Xenon lamps
the locator lighting lamps in the
exterior rear view mirrors
Warning!G
Bulbs and bulb sockets can be very hot.
Allow 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.
!Do not replace the LEDs yourself. You could
otherwise damage the LEDs or parts of the vehi-
cle. Only have the LEDs replaced at an autho-
rized Mercedes-Benz Light Truck Center.
Page 381 of 457
380 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 117).Bi-Xenon headlamp Parking and standing lamp bulbLeft headlamp shown, right headlamp
laterally reversed
1Securing screw (trim panel)
2Headlamp trim panel
Loosen and remove securing
screws1.
Remove headlamp trim panel2 in
direction of arrow and the seal.
iG 55 AMG (U.S. vehicles only):
Fold the brush guard down before replacing
bulbs (
page 375).
G55AMG:
Remove the protective grille before replacing the
bulbs.
Warning!G
Do not remove the low beam/high beam
cover for the Bi-Xenon headlamp. Because
of high voltage in Xenon lamps, it is danger-
ous to replace the bulb or repair the lamp
and its components. We recommend that
you have such work done by a qualified
technician.
Page 382 of 457
381 Practical hints
Replacing bulbs
Left headlamp shown, right headlamp
laterally reversed
3Securing screw (headlamp)
4Adjusting screw (headlamp)
5Headlamp
Loosen and remove headlamp-securing
screws3.
Remove headlamp5.5Headlamp
6Bulb socket
Hold headlamp5, push gently onto
bulb socket6, and turn bulb
socket6 counterclockwise to its
stop.
Pull bulb socket6 out of
headlamp5.7Bulb
Pull bulb7 out of its bulb socket.
Insert the new bulb into the bulb
socket.
Hold headlamp5, insert bulb
socket6 into headlamp5, and turn
bulb socket6 clockwise to its stop.
Insert headlamp5 and install and
tighten headlamp-securing screws3.
Install headlamp trim panel2 and the
seal.
Install and tighten securing screws1.
iDo not turn adjusting screw4. If adjusting
screw4 is turned, the headlamp adjustment
must be checked at a Mercedes-Benz Light
Truck Center.
Page 383 of 457
382 Practical hints
Replacing bulbs
Front fog lamp bulb
Right front fog lamp shown, left front fog
lamp laterally reversed
1Securing screw (trim panel)
2Front fog lamp trim panel
Loosen and remove securing
screws1.
Remove front fog lamp trim panel2 in
direction of arrow and the seal.
Right front fog lamp shown, left front fog
lamp laterally reversed
3Securing screw (front fog lamp)
4Adjusting screw (front fog lamp)
5Front fog lamp
Loosen and remove front fog
lamp-securing screws3.
Remove front fog lamp5.5Front fog lamp
6Bulb socket
Hold front fog lamp5, push gently
onto bulb socket6, and turn bulb
socket6 counterclockwise to its
stop.
Pull bulb socket6 out of front fog
lamp5.
iDo not turn adjusting screw4. If adjusting
screw4 is turned, the front fog lamp adjust-
ment must be checked at a Mercedes-Benz Light
Truck Center.
Page 384 of 457
383 Practical hints
Replacing bulbs
7Bulb
Pull bulb7 out of its bulb socket.
Insert the new bulb into the bulb
socket.
Hold front fog lamp5, insert bulb
socket6 into front fog lamp5, and
turn bulb socket6 clockwise to its
stop.
Insert front fog lamp5 and install and
tighten front fog lamp-securing
screws3.
Install front fog lamp trim panel2 and
the seal.
Install and tighten securing screws1.Front turn signal lamp bulb
1Securing screw
2Turn signal lens
Loosen and remove securing
screws1.
Remove turn signal lens2.3Bulb
Press bulb3 gently into the socket,
turn counterclockwise and remove it.
Press the new bulb gently into the
socket and turn clockwise until it
engages.
Reinstall turn signal lens2.
Install and tighten securing screws1.
iG55AMG:
Remove the protective grille before replacing the
bulbs.
iDo not overtighten securing screws1.
Otherwise turn signal lens2 could be damaged.