2008 MERCEDES-BENZ GL550 sunroof

254 Controls in detail
Power tilt/sliding sunroof*
Switch off the ignition (page 42).
Remove the SmartKey from the starter
switch.
Vehicles with KEYLESS-GO*:
Switch off the ignition (page 43).
Open the driver’s door (this puts
the starter switch in position0,
same as with the SmartKey
removed from the starter switch).
The driver’s door then can be
closed again.
Remove the fuse for the tilt/sliding
sunroof from the fuse box
(
page 543).
Reinsert the fuse in the main box.
Switch on the ignition (page 42).
Press and hold the sunroof switch in
the direction of arrow3 (
page 252)
until the tilt/sliding sunroof is fully
raised at the rear.
Hold the sunroof switch in the direction
of arrow3 for approximately
1 second.
Open the tilt/sliding sunroof using the
Express-open feature (
page 253).
If the tilt/sliding sunroof opens
completely, it is synchronized.
If the tilt/sliding sunroof does not open
completely:
Repeat the above steps.
iFor information on which fuse box contains
the fuse for the power tilt/sliding sunroof, see
the fuse chart provided with the vehicle tool kit
(
page 490).
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295 Controls in detail
Loading
Loading
Carriers*
Roof rails
Crossbars*
The maximum roof load (
page 561) of
any add-on roof equipment is reduced by
the unladen weight of the crossbars
(13.7 Ibs/6.2 kg).
Four keys and an Allen wrench required for
installing and removing are included with
the crossbars.
Warning!G
Only use carriers* when the crossbars have
been completely mounted. The left and right
roof rails are only stabilized by means of the
crossbars mounted.
Follow the manufacturer’s installation
instructions. Otherwise, an improperly at-
tached roof rack system or its load could be-
come detached from the vehicle.
Do not exceed the maximum roof load of
198lb (90kg).
Take into consideration that when the roof is
loaded, the handling characteristics are dif-
ferent from those when operating the vehi-
cles without a roof loaded.
!Load the carriers* in such a way that the
vehicle cannot be damaged while driving.
Make sure

the tailgate can be completely opened

the tilt/sliding sunroof can be completely
raised at the rear
iThe following accessories are available for
your Mercedes-Benz:

Roof Cargo Container – Small, Medium, or
Large

Ski and Snowboard Carrier – Standard

Ski and Snowboard Carrier – Deluxe (Only in
connection with corresponding adapter.)
For more information on Mercedes-Benz acces-
sories, contact your authorized Mercedes-Benz
Light Truck Center.
iThe keys and the Allen wrench are stored
with the vehicle tool kit under the cargo compart-
ment floor (
page 490).
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297 Controls in detail
Loading
Otherwise, the crossbars (page 298),
mounted accessories and the objects at-
tached to them could come loose from the
vehicle causing an accident, thereby injuring
you and other persons and/or causing dam-
age to property, including damage to your
vehicle.
Warning!G
A roof load creates a greater surface area
exposed to the wind and causes the vehicle
to have a higher center of gravity, thereby
changing the vehicle’s driving characteris-
tics. Accordingly, the additional weight on
the roof of the vehicle can have a detrimen-
tal effect on braking, cornering and acceler-
ation.
Never exceed the maximum permissible
roof load or the maximum permissible vehi-
cle weight, even when accessories for the
crossbars (e.g. ski racks, bicycle racks, etc.)
are being used. Overloading the vehicle
could result in an accident. When calculat-
ing the weight placed on the roof please
make sure to add the weight of the cross-
bars, accessory racks and the load carried
together.
Always adapt your driving style to the road,
traffic and weather conditions, and drive
with added caution when the roof is loaded.
Always drive with extreme care when the
roof rack is loaded. Take into consideration
that when the roof rack is loaded, the han-
dling characteristics are different from
those when operating the vehicles without a
roof rack loaded.Warning!G
Do not use accessories which have not been
approved by Mercedes-Benz for use in con-
junction with these crossbars. If non-ap-
proved accessories are used, these
accessories and/or the objects attached to
them could come loose from the vehicle,
thereby injuring you and other persons
and/or causing damage to property, includ-
ing damage to your vehicle.
!Have a second person assist you when
installing the crossbars. The vehicle could other-
wise be damaged.
!Objects attached to the crossbar system’s
accessories must not be allowed to restrict the
movement of the tilt/sliding sunroof. The
tilt/sliding sunroof could otherwise be damaged
when it is raised.
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357 Operation
Driving instructions
Checklist before off-road driving
Engine oil level

Check the engine oil level with the oil
dipstick (
page 380).
Only with a proper oil level can the
vehicle obtain a trouble-free oil supply,
even on steep gradients.
!Observe the following during off-road
driving:

Keep doors, tailgate, windows, and
tilt/sliding sunroof* closed whenever driving
off-road.

Adjust vehicle speed to condition of terrain.
The more uneven, rutty and steeper the ter-
rain, the lower the speed should be. Drive
through water slowly at an even speed,
avoiding a bow wave.

Be especially careful when driving in un-
known territory. It may be necessary to get
out of the vehicle and scout the path you in-
tend to take.

Watch out for obstacles, such as rocks,
holes, tree stumps and ruts.

Before driving through water, determine its
depth.

Do not stop vehicle while immersed in water,
and do not shut off the engine.

In sandy soil, drive at a steady speed as al-
lowed by conditions. This helps overcome
the vehicle rolling resistance and reduces
the likelihood of the vehicle sinking into the
ground.

Do not initiate jumps with the vehicle. It
interrupts the forward momentum of the
vehicle.

Always drive onto slopes with the engine
running and the vehicle in gear.

Do not shift automatic transmission to
positionN.
Warning!G
Do not reduce the tire inflation pressure
before driving through sand. However, if you
do so, remember to correct the tire inflation
pressure (
page 395) before continuing
your trip. Driving with reduced tire inflation
pressure increases the risk of losing control
of the vehicle and rolling over.
!If the engine oil level warning lamp
(
page 473) comes on while driving, stop the
vehicle in a safe location or as soon at is safe to
do so. Check the engine oil level (
page 380).
The engine oil level warnings should not be
ignored. Extended driving with the symbol
displayed could result in serious engine damage
that is not covered by the Mercedes-Benz
Limited Warranty.
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432 Operation
Vehicle care
Use a soft, clean cloth and a mild win-
dow cleaning solution on all outside
and inside glass surfaces.
An automotive glass cleaner is recom-
mended.Light alloy wheels
If possible, clean wheels once a week.
Use Mercedes-Benz approved Wheel
Care, a soft bristle brush and a strong
spray of water for cleaning the light al-
loy wheels.Plastic and rubber parts
Use a gentle dishwashing detergent or
mild detergent for delicate fabrics as a
washing solution.
Wipe with a cloth moistened in a
lukewarm solution.
The surface may temporarily change
color. If this is the case, wait for it to
dry.
!Fold the windshield wiper arms back onto
the windshield before turning the SmartKey in
the starter switch or pressing the KEYLESS-GO
start/stop button (vehicles with KEYLESS-GO*).
Hold on to the wiper when folding the wiper arm
back. If released, the force of the impact from
the tensioning spring could crack the windshield.
!To clean the window interior, do not use a
dry cloth, abrasives, solvents or cleaners con-
taining solvents. Do not touch the inside of the
front, rear or side windows and the power
tilt/sliding sunroof* or rear panorama roof with
hard objects such as an ice scraper or ring.
Doing so may damage the windows.
!Only use acid-free cleaning materials. Acid
may cause corrosion or damage the clear coat.
!The vehicle should not be parked for an ex-
tended period of time immediately after it has
been cleaned, especially not after the wheel rims
have been cleaned with wheel rim cleaner.
Wheel rim cleaners can lead to increased
corrosion of the brake disks and brake pads.
Non-approved wheel cleaners may also damage
the wheel paint if the car is not driven after
cleaning. Therefore, the vehicle’s brake system
should always be warmed-up before it is parked
after cleaning. To do so, please drive your vehicle
for several minutes to allow the brakes to dry.
When applying Mercedes-Benz approved Tire
Care and Mercedes-Benz approved Wheel Care
products, take care not to spray them on the
brake disks.
Warning!G
Do not use cleaners or cockpit care sprays
containing solvents to clean the cockpit or
the steering wheel. Cleaners containing sol-
vents will make the surface porous and vehi-
cle occupants could suffer serious injuries
from plastic parts coming loose in the event
of air bag deployment.

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535 Practical hints
Battery
Connect the positive lead to the posi-
tive terminal and fasten it’s cover
(
page 533).
Connect the negative lead to the nega-
tive terminal (
page 533).
Charging the battery
If the battery is discharged, the battery can
be charged using the jump-start contacts
located in the engine compartment
(
page 537).
Charge the battery in accordance with
the instructions of the battery charger
manufacturer.
Batteries contain materials that can harm
the environment if disposed of improperly.
Large 12-volt storage batteries contain
lead. Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.
!Never invert the terminal connections!
iThe following procedures must be carried
out following any interruption of battery power
(e.g. due to reconnection):

Set the clock (page 174).
Vehicles with COMAND system with naviga-
tion module*: Time and date are set auto-
matically.

Synchronize the door windows
(
page 249).

Synchronize the power tilt/sliding sunroof*
(
page 253).

Synchronize the power folding exterior rear
view mirrors* (
page 209).
Warning!G
Never charge a battery while still installed in
the vehicle unless the accessory battery
charge unit approved by Mercedes-Benz is
being used. Gases may escape during charg-
ing and cause explosions that may result in
paint damage, corrosion or personal injury.
An accessory battery charge unit specially
adapted for Mercedes-Benz vehicles and
tested and approved by Mercedes-Benz is
available, permitting the charging of the
battery in its installed position. Contact an
authorized Mercedes-Benz Light Truck
Center for information and availability.
Charge battery in accordance with the
separate instructions for the accessory
battery charger.
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581 Index
Instruments and controls see Cockpit
Interior lighting 149
Delayed shut-off 177
Interior rear view mirror 51
Antiglare positions 208
Auto-dimming mirrors* 208
Interior storage spaces see
Storage compartments
Intermittent wiping
Windshield wipers 63
J
Jack 492, 493
Lifting the vehicle 520
Jump starting 536
K
Key, Mechanical 496
Key, SmartKey 112
Batteries 120, 502
Battery check lamp 112
Checking battery condition 120
Closing the power windows
(Convenience closing feature) 250
Closing the tilt/sliding sunroof*
(Convenience closing feature) 250Closing, Power tailgate* 126
Factory setting 114
Locking/unlocking 40, 70, 112
Locking/unlocking, Global
setting 114
Loss of 120
Messages in the multifunction
display 476
Opening the power windows
(Summer opening feature) 249
Opening the tilt/sliding sunroof*
(Summer opening feature) 249
Remote control 112
Replacing batteries 502
Selective setting 114
Starter switch positions 42
Starting the engine 56
Turning off the engine 69
Key, SmartKey with KEYLESS-GO*
Batteries 120, 502
Battery check lamp 115
Checking battery condition 120
Closing the power windows
(Convenience closing feature) 250Closing the tilt/sliding sunroof*
(Convenience closing feature) 250
Closing/locking, Power
tailgate* 127
Factory setting 118
Important notes 117
Locking/unlocking 41, 70, 115
Locking/unlocking, Global
setting 118
Loss of 120
Messages in the multifunction
display 475, 476
Opening the power windows
(Summer opening feature) 249
Opening the tilt/sliding sunroof*
(Summer opening feature) 249
Remote control 115
Replacing batteries 502
Selective setting 119
Start/stop button 43
Starter switch positions 42, 43
Starting the engine 57
Turning off the engine 69
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586 Index
Plastic and rubber parts, cleaning 432
Poly-V-belt drive
Layout (GL 320 CDI) 552
Layout (GL 450, GL 550) 552
Positions (Memory function*) see Seats
Pounds per square inch see PSI
Power assistance 348
Power outlets 324
Power seat see Seats, Power
Power tilt/sliding sunroof* 251
Convenience closing feature 250
Opening/closing 251
Stopping 250
Summer opening feature 249
Synchronizing 253
Power washer 426Power windows 246
Cleaning 431
Convenience closing feature 250
Door windows 247
Hinged quarter windows* 248
Opening/closing 246
Rear door windows, Blocking
operation 98
Summer opening feature 249
Synchronizing, Door windows 249
Practical hints 490
Premium unleaded gasoline 565
Problems
While driving 65
With starting see Starting difficulties
With the vehicle 18
Product information 9
Production options weight 417
PSI 417
Push-starting see Tow-startingQ
Quarter windows* see Power windows
R
Radio
AUDIO menu, Control system 164
Selecting station 164
Selecting station (satellite*) 164
Radio transmitters 370
Range (distance to empty) 185
Range of the sensors
Parktronic* 289
Reading lamp, front 149
Reading lamp, second-row 151
Rear automatic climate control 241, 244
Rear center console ashtray see Ashtrays
(Depending on vehicle configuration)
Rear climate control* 226
Rear door windows
Blocking operation 98
Rear fog lamp see Fog lamps
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