2007 MERCEDES-BENZ GL450 headlamp

429 Operation
Vehicle care
Insert the SmartKey with
KEYLESS-GO* into the starter switch.
Switch on the ignition.
Depress the brake pedal.
Shift the automatic transmission to
neutral positionN
Release the brake pedal.
If engaged, release the parking brake
(
page 60).
Switch off the ignition and leave the
SmartKey with KEYLESS-GO* in the
starter switch.Ornamental moldings
For regular cleaning and care of ornamen-
tal moldings, use a damp cloth.Headlamps, brake lamps, tail lamps,
side markers, turn signal lenses
Use a mild car wash detergent, such as
Mercedes-Benz approved Car Sham-
poo, with plenty of water.
iAfter running the vehicle through an auto-
matic car wash, wipe any wax off of the wind-
shield (
page 431). This will prevent smears
and reduce wiping noise which can be caused by
residual wax on the windshield.
When leaving the car wash, make sure that the
mirrors are folded out. Otherwise they may
vibrate.
!Do not use chrome cleaner on ornamental
moldings. Although ornamental moldings may
have chrome appearance, they could be made of
anodized aluminum that will be damaged when
cleaned with chrome cleaner. Instead, use a
damp cloth to clean those ornamental moldings.
For very dirty ornamental moldings of which you
are sure are chrome-plated, use a chrome clean-
er. If in doubt whether an ornamental molding is
chrome-plated, contact an authorized
Mercedes-Benz Light Truck Center.
!Only use window cleaning solutions that are
suitable for plastic lamp lenses. Window clean-
ing solutions which are not suitable may damage
the plastic lamp lenses of the headlamps. There-
fore, do not use abrasives, solvents or cleaners
that contain solvents.
Never apply strong force and only use a soft,
non-scratching cloth when cleaning the lenses.
Do not attempt to wipe dirty lenses with a dry
cloth or sponge.
Otherwise you may scratch or damage the lens
surface.

452 Practical hints
What to do if …
On the pages that follow, you will find a
compilation of the most important warning
and malfunction messages that may
appear in the multifunction display.
For your convenience the messages are
divided into two sections:

Text messages (page 453)

Symbol messages (page 469)
Warning!G
No messages will be displayed if either the
instrument cluster or the multifunction
display is inoperative.
As a result, you will not be able to see infor-
mation about your driving conditions, such
as speed or outside temperature, warn-
ing/indicator lamps, malfunction/warning
messages or the failure of any systems.
Driving characteristics may be impaired.
If you must continue to drive, please do so
with added caution. Visit an authorized
Mercedes-Benz Light Truck Center as soon
as possible.
iSwitching on the ignition causes all
instrument cluster lamps (except high beam
headlamp indicator lamp, and turn signal
indicator lamps unless activated) as well as the
multifunction display to come on. Make sure the
lamps and multifunction display are in working
order before starting your journey.

481 Practical hints
What to do if …
Display symbolDisplay messagesPossible cause/consequencePossible solution
. 3rd brake lampThe high mounted brake lamp is
malfunctioning. This message
will only appear if a critical num-
ber of LEDs have stopped work-
ing.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
Active headlamps
inoperativeThe active Bi-Xenon* headlamps
system is malfunctioning.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
Brake lamp
LeftThe left brake lamp is malfunc-
tioning. A substitute bulb is
being used.Replace the bulb as soon as possible
(
page 515).
Brake lamp
RightThe right brake lamp is malfunc-
tioning. A substitute bulb is
being used.Replace the bulb as soon as possible
(
page 515).
Display malfunction
Visit workshopThe display for the lamps or the
system is malfunctioning.Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
Front foglamp
LeftThe left front fog lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 514).
Front foglamp
RightThe right front fog lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 514).

482 Practical hints
What to do if …
Display symbolDisplay messagesPossible cause/consequencePossible solution
. Parking lamp
Front LeftThe front left parking lamp is
malfunctioning. A substitute
bulb is being used.Replace the bulb as soon as possible
(
page 513).
Parking lamp
Front RightThe right front parking lamp is
malfunctioning. A substitute
bulb is being used.Replace the bulb as soon as possible
(
page 513).
High beam
LeftThe left high beam lamp is
malfunctioning.Halogen headlamp:
Replace the bulb as soon as possible
(
page 512).
Bi-Xenon* headlamp:
Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
High beam
RightThe right high beam lamp is
malfunctioning.Halogen headlamp:
Replace the bulb as soon as possible
(
page 512).
Bi-Xenon* headlamp:
Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.

483 Practical hints
What to do if …
Display symbolDisplay messagesPossible cause/consequencePossible solution
. License plate lamp
LeftThe left license plate lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 518).
License plate lamp
RightThe right license plate lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 518).
AUTO Light
inoperativeThe light sensor is malfunction-
ing. The headlamps switch on
automatically.Contact an authorized Mercedes-Benz
Light Truck 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 146).
Switch off the headlamps using the
exterior lamp switch (
page 145).
Low beam
LeftThe left low beam lamp is
malfunctioning.Halogen headlamp:
Replace the bulb as soon as possible
(
page 511).
Bi-Xenon* headlamp:
Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.

484 Practical hints
What to do if …
Display symbolDisplay messagesPossible cause/consequencePossible solution
. Low beam
RightThe right low beam lamp is
malfunctioning.Halogen headlamp:
Replace the bulb as soon as possible
(
page 511).
Bi-Xenon* headlamp:
Contact an authorized Mercedes-Benz
Light Truck Center as soon as possible.
Marker lamp
Front LeftThe left front side marker lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 514).
Marker lamp
Front RightThe right front side marker lamp
is malfunctioning.Replace the bulb as soon as possible
(
page 514).
Foglamp
Rear LeftThe left rear fog lamp is malfunc-
tioning.Replace the bulb as soon as possible
(
page 515).
Reverse lamp
LeftThe left backup lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 515).
Reverse lamp
RightThe right backup lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 515).

485 Practical hints
What to do if …
Display symbolDisplay messagesPossible cause/consequencePossible solution
. Switch off lightsYou have removed the SmartKey
from the starter switch, opened
the driver’s door and left the
headlamps on or removed the
SmartKey with KEYLESS-GO*
from the vehicle and left the
headlamps on.Switch off the headlamps (page 69).
Switch off lights
or remove keyYou have opened the driver’s
door while the exterior lamp
switch is in positionU and
the SmartKey is still in the start-
er switch.
The parking lamps are still on.Switch off the headlamps (page 69).
or
Remove the SmartKey from the starter
switch.
Tail lamp
LeftThe left tail lamp is malfunction-
ing. A substitute bulb is being
used.Replace the bulb as soon as possible
(
page 515).
Tail lamp
RightThe right tail lamp is malfunc-
tioning. A substitute bulb is be-
ing used.Replace the bulb as soon as possible
(
page 515).

508 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 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 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 the messages in the multi-
function display (
page 481).