2008 MERCEDES-BENZ GL550 Owner's Manual

496 Practical hints
Unlocking/locking in an emergency
Unlocking the vehicle
If you cannot unlock the vehicle with the
SmartKey or KEYLESS-GO*, open the
driver’s door using the mechanical key.Removing the mechanical key
1Mechanical key locking tab
2Mechanical key
Move locking tab1 in direction of
arrow.
The mechanical key2 comes out.
Slide mechanical key2 out of the
housing.Unlocking the driver’s door
Insert mechanical key2 into the
driver’s door lock until it stops.
Turn mechanical key2 counterclock-
wise to position1 and hold it there.
Pull the door handle until the locking
knob moves up (
page 120).
The driver’s door is unlocked.
Pull the door handle once more to open
the driver’s door.
iUnlocking the driver’s door with the
mechanical key will trigger the anti-theft alarm
system.
To cancel the alarm, insert the SmartKey or
SmartKey with KEYLESS-GO* in the starter
switch.
1Unlocking
2Mechanical key
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497 Practical hints
Unlocking/locking in an emergency
Locking the vehicle
If you cannot lock the vehicle with the
SmartKey or KEYLESS-GO*, lock the vehi-
cle carrying out the following steps.
Close the front passenger door, the
rear right door and the tailgate.
Open the driver’s door and the rear left
door.
Press the central locking switch on the
driver’s door (
page 128).
The locking knobs of the front passen-
ger door and the rear doors move
down.
If the vehicle battery is disconnected or
drained:
Press down the locking knobs of
the front passenger door and the
rear doors manually.
Exit the vehicle.
Close the driver’s door.
Enter the vehicle through the rear left
door.
Press down the locking knob of the
driver’s door.
Exit the vehicle.
Close the rear left door.
The vehicle is locked.
Fuel filler flap
Open the tailgate (page 122).
The fuel filler flap release is located behind
a cover in the right side trim panel of the
cargo compartment.
1Lock
2Cover
!To prevent inadvertent lockout, make sure
to have the SmartKey or SmartKey with
KEYLESS-GO* with you before proceeding with
the next step. The next step will lock the vehicle.
iThis procedure does not arm the anti-theft
alarm system, nor does it lock the fuel filler flap.

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498 Practical hints
Unlocking/locking in an emergency
Insert a suitable object such as a coin
into the slot of lock1 (
page 497).
Turn lock1 counterclockwise by 90°
in direction of arrow.
Remove cover2 (page 497).
3Fuel filler flap release
Pull red fuel filler flap release3 in
direction of arrow.
The fuel filler flap is unlocked.
Open the fuel filler door (page 374).

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499 Practical hints
Resetting activated head restraints
Resetting activated head restraints
If the active head restraints have been trig-
gered in a rear-end collision, the active
head restraints must be reset. Otherwise,
the active head restraints cannot offer any
additional protection in the event of anoth-
er rear-end collision.
You can tell that the head restraints have
been activated when they have been
moved forward and cannot be adjusted.
Vehicles without Rear seat entertain-
ment system*1Pull
2Adjust downward
3Press
Pull the top of the head restraint cush-
ion in direction of arrow1 as far as it
will go.
Adjust the head restraint cushion
downward in direction of arrow2 as
far as it will go.
Firmly press the top of the active head
restraint cushion towards the head
restraint cover in direction of arrow3
until it engages.
Warning!G
For safety reasons, have the active head re-
straints checked by an authorized
Mercedes-Benz Light Truck Center after a
rear-end collision.
Warning!G
When pushing back the head restraint cush-
ion, take care that your fingers do not be-
come caught between the head restraint
cushion and the cover. Failing to do so may
lead to injury.
!Be careful not to damage upholstery.
iFor your convenience, we recommend that
you have this work carried out by an authorized
Mercedes-Benz Light Truck Center.
iPressing the head restraint cushion back
requires high force. If you encounter difficulties
when pushing the head restraint back please
have the procedure performed at an authorized
Mercedes-Benz Light Truck Center.

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500 Practical hints
Resetting activated head restraints
Repeat this procedure on the active
head restraint for the second front
seat.
For information on active head restraints,
see “Active head restraint” (
page 90).
For information on head restraint adjust-
ment, see “Seats” (
page 45).Vehicles with Rear seat entertainment
system*
Take the reset tool out of the
Mercedes-Benz vehicle literature
pouch.
1Reset tool
2Active head restraint1Reset tool
2Active head restraint
3Rectangular opening
Guide reset tool1 into rectangular
opening3 of active head restraint2.
Press reset tool1 downward in
direction of arrow until you hear the
head restraint release mechanism
audibly disengage.
Pull out reset tool1.

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501 Practical hints
Resetting activated head restraints
Firmly press the active head restraint
cushion backward towards the head
restraint cover in direction of arrow
until it engages.
Repeat this procedure on the active
head restraint for the second front
seat.
After resetting the active head
restraints store reset tool1 in the
Mercedes-Benz vehicle literature
pouch.
For information on active head restraints,
see “Active head restraint” (
page 90).
For information on head restraint adjust-
ment, see “Seats” (
page 45).
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502 Practical hints
Replacing SmartKey batteries
If 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 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 mechanical key1 from the
SmartKey or SmartKey with
KEYLESS-GO* (
page 496).1Mechanical key
2Battery compartment
Insert mechanical key1 into opening.
Press mechanical key1 in direction of
arrow.
The battery compartment2 is
unlatched.
Pull battery compartment2 out of the
SmartKey housing.
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.
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503 Practical hints
Replacing SmartKey batteries
3Batteries
4Contact spring
Pull out batteries3.
Using a line-free cloth, insert new
batteries3 under contact springs4
with the positive terminal (+) side
facing up.
Return battery compartment2 into
housing until it locks into place.
Slide mechanical key1 back into the
SmartKey or SmartKey with
KEYLESS-GO*.
Check the operation of the SmartKey
or SmartKey with KEYLESS-GO*.
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