turn signal bulb MERCEDES-BENZ R320 2008 W251 Owner's Manual

460 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
. Turn Signal
Rear LeftThe left rear turn signal lamp is
malfunctioning. A substitute
bulb is being used.Replace the bulb as soon as possible
(
page 480).
Turn Signal
Rear RightThe right rear turn signal lamp is
malfunctioning. A substitute
bulb is being used.Replace the bulb as soon as possible
(
page 480).
Turn Signal
Front LeftThe left front turn signal lamp is
malfunctioning. A substitute
bulb is being used.Replace the bulb as soon as possible
(
page 480).
Turn Signal
Front RightThe right front turn signal lamp is
malfunctioning. A substitute
bulb is being used.Replace the bulb as soon as possible
(
page 480).
Turn Signal
Left MirrorThe turn signal in the left exte-
rior rear view mirror is malfunc-
tioning. This message will only
appear if a critical number of
LEDs have stopped working.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
Turn Signal
Right MirrorThe turn signal in the right exte-
rior rear view mirror is malfunc-
tioning. This message will only
appear if a critical number of
LEDs have stopped working.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.

480 Practical hints
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 autho-
rized 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 humid-
ity, 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

Brake lamps

Parking lamps

Tail lamps
Read and observe messages in the multifunction
display (
page 455).

481 Practical hints
Replacing bulbs
Front lampsRear lamps
LampType
1Parking/standing lampW 5 W
2Turn signal lampPY 21 W
3Additional turn signal
lamp
LED
4Headlamps:
Low beam
H7 (55 W)
Bi-Xenon headlamps*:
Low beam1D2S-35 W
5Headlamps:
High beam/high beam
flasher
H7 (55 W)
Bi-Xenon headlamps*:
High beam/high beam
flasher spot lamp
H7 (55 W)
6Side marker lampWY 5 W
7Front fog lampH7 (55 W)
Corner-illuminating
front fog lamp*
H7 (55 W)
1Vehicles with Bi-Xenon* headlamps: Do not
replace the Bi-Xenon bulbs yourself. Contact an
authorized Mercedes-Benz Light Truck Center.
LampType
LampType
8High-mounted brake
lamp
LED
9Tail, brake, and side
marker lamp
P 21 W
aTurn signal lampPY 21 W
bBackup lampP 21 W
cRear fog lamp (driver’s
side only)
P 21 W
dLicense plate lampsC 5 W

482 Practical hints
Replacing bulbs
Notes on bulb replacement

Only use 12-volt bulbs of the same type
and with the specified watt rating.

Switch the 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 by 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* low beam lamps

the Bi-Xenon* high beam flasher spot-
light

the front side marker lamps
Warning!G
Bulbs and bulb sockets can be very hot.
Allow the lamp to cool down before chang-
ing 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 bulbs yourself. You could
otherwise damage the LEDs or parts of the
vehicle. Only have the LEDs replaced by an
authorized Mercedes-Benz Light Truck Center.

483 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 143).
Open the hood (page 356).
Halogen headlamps
1Low beam/high beam headlamp cover2Bulb socket for turn signal lamp
2Bulb socket for turn signal lamp
3Bulb socket for low beam headlamp
4Bulb socket for high beam headlampLow beam headlamp bulbs
Turn cover 1 counterclockwise.
Remove cover 1.
Turn bulb socket 3 counterclockwise.
Pull bulb socket 3 out of the head-
lamp housing.
Pull the low beam bulb out of bulb
socket 3.
Insert the new low beam bulb into bulb
socket 3.
Insert bulb socket 3 into the head-
lamp housing.
Turn bulb socket 3 clockwise until it
engages.
Place cover 1 on the opening in the
headlamp housing.
Turn cover 1 clockwise until it
engages.

484 Practical hints
Replacing bulbs
High beam headlamp bulbs
Turn cover 1 counterclockwise.
Remove cover 1.
Turn bulb socket 4 counterclockwise.
Pull bulb socket 4 out of the head-
lamp housing.
Pull the high beam bulb out of bulb
socket 4.
Insert the new high beam bulb into bulb
socket 4.
Insert bulb socket 4 into the head-
lamp housing.
Turn bulb socket 4 clockwise until it
engages.
Place cover 1 on the opening in the
headlamp housing.
Turn cover 1 clockwise until it
engages.Front turn signal lamp bulbs
Pull bulb socket 2 out of the head-
lamp housing.
Pull the turn signal bulb out of bulb
socket 2.
Insert the new turn signal bulb into bulb
socket 2.
Insert bulb socket 2 into the head-
lamp housing.Bi-Xenon headlamps*
1Bulb socket for turn signal lamp
2Low beam/high beam headlamp cover
– Do not remove
1Bulb socket for turn signal lamp

485 Practical hints
Replacing bulbs
Low beam and high beam flasher spot
bulbs
Front turn signal lamp bulbs
Pull bulb socket 1 out of the head-
lamp housing.
Pull the turn signal bulb out of bulb
socket 1.
Insert the new turn signal bulb into bulb
socket 1.
Insert bulb socket 1 into the head-
lamp housing.Parking and standing lamp bulbs
1Bulb socket for parking and standing
lamp
Turn bulb socket 1 counterclockwise.
Pull bulb socket 1 out of the housing.
Pull the bulb out of bulb socket 1.
Insert the new parking and standing
lamp bulb into bulb socket 1.
Insert bulb socket 1 into the housing.
Turn bulb socket 1 clockwise until it
engages.Front fog lamp bulbs
1Front fog lamp
2Cover
3Retaining screws
Remove retaining screws3.
Take off cover 2.
Warning!G
Do not remove the low beam/high beam
cover for the Bi-Xenon* headlamp. Because
of high voltage in Bi-Xenon* lamps, it is dan-
gerous to replace the bulb or repair the lamp
and its components. We recommend that
you have such work done by a qualified
technician.
iThe following procedure also applies to
corner-illuminating front fog lamps*.


487 Practical hints
Replacing bulbs
Additional turn signal lamps bulbs
The additional turn signal lamps in the
exterior rear view mirrors have LEDs.
If a malfunction occurs or LEDs fail to
function, the entire turn signal unit must
be replaced. Have the turn signal unit re-
placed by an authorized Mercedes-Benz
Light Truck 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 Light Truck Center.Replacing bulbs for rear lamps
Before you start to replace a bulb for a rear
lamp, do the following first:
Turn the combination switch to
positionM (
page 143).
Tail lamp unit
Open the tailgate (page 119).Opening the side trim panels
1Lock
2Cover in left side trim panel
1Lock
2Cover in right side trim panel
iTo access the tail lamp units, you have to
remove the cover in the corresponding side trim
panel of the cargo compartment.


488 Practical hints
Replacing bulbs
Insert a suitable object such as a coin
into the slot of lock1.
Turn lock1 clockwise (left side trim
panel) or counterclockwise (right side
trim panel) by 90° in direction of arrow.
Remove cover2.
Replacing bulbs
1Tail, side marker, standing, and parking
lamp bulb socket
2Turn signal lamp bulb socket
3Fog lamp bulb socket
(driver’s side only)
4Backup lamp bulb socket
Depending on which bulb needs to be
replaced, turn the respective bulb
socket 1 - 4 counterclockwise.
Pull the bulb socket out of the housing.
Similarly turn the bulb counterclock-
wise carefully and pull the bulb out of
bulb socket.
Insert the new bulb into the bulb
socket.
Turn the bulb in the bulb socket clock-
wise carefully.
Insert the bulb socket into the housing.
Turn the bulb socket clockwise until it
engages.License plate lamps
1License plate lamp cover
2Screw
Loosen screws2.
Remove license plate lamp cover1.
Replace the license plate lamp bulb.
Reinstall license plate lamp cover1.
Retighten screws2.


555 Index
Messages in the multifunction
display 453–454
Opening the power windows
(Summer opening feature) 244
Opening the tilt/sliding panel*
(Summer opening feature) 244
Opening the tilt/sliding sunroof*
(Summer opening feature) 244
Remote control 113
Replacing batteries 479
Selective settings 117
Start/stop button 41
Starter switch positions 39, 41
Starting the engine 54
Turning off engine 66
Unlocking and opening, Power
tailgate* 121
Kickdown 197
Kilopascal 394L
Labels 524
Certification label 524
Emission control information 525
Engine number 525
Paint code 524
Vehicle Identification Number
(VIN) 525
Lamps, exterior 481
Front 481
Light sensor, Messages in the multi-
function display 455
Messages in the multifunction
display 455–460
Rear 481
Lamps, Indicator and warning
ABS 27, 414, 415
Brakes 27, 415
Center console 31, 425
CHECK ENGINE 29, 417, 418
Distance warning lamp* 266
Engine diagnostics 29, 417, 418
ESP
®27, 419
Front passenger front
air bag off 76, 77, 81, 82, 425Fuel reserve 29, 424
High beam headlamps 29
Instrument cluster 26, 414
Parktronic* 283, 284
Preglow indicator, Diesel engine 29
Seat belt telltale 29, 82, 420
Seat heating* 139
Seat ventilation* 140
SRS 29, 70, 85, 424
Turn signals 27
Language, Setting 174
LATCH-type child seat anchors see
Children in the vehicle
Leather upholstery, Cleaning and
care of 412
License plate lamps 481
Messages in the multifunction
display 457
Replacing bulbs 481, 488
Light alloy wheels, Cleaning 410
Light sensor
Messages in the multifunction
display 455
Lighter see Cigarette lighter