MERCEDES-BENZ R350 2008 W251 Owner's Manual

470 Practical hints
Where will I find ...?
Screw-type vehicle jack
Storage position
Push crank handle up.
Operational position
Turn crank handle clockwise until it
engages (operational position).
Before storing the vehicle jack in its stor-
age compartment:

The vehicle jack should be fully
collapsed.

The handle must be folded in (storage
position).
Scissors-type vehicle jack
Storage position
Take the reversible ratchet out of the
vehicle tool kit.
Operational position
1Scissors-type vehicle jack
2Reversible ratchet
Attach reversible ratchet2 to vehicle
jack in such a way that the wordUP
can be seen.
Before storing the vehicle jack in its
compartment:

It should be fully collapsed (storage
position).

The ratchet must be removed.

471 Practical hints
Where will I find ...?
Setting up the collapsible wheel chock
The collapsible wheel chock serves to ad-
ditionally secure the vehicle, e.g. while
changing the wheel.
1Tilt the plate upward
2Fold the lower plate outward
3Insert the plateTilt both plates upward1.
Fold the lower plate outward2.
Guide the tabs of the lower plate all the
way into the openings of base plate3.
For information on where to place wheel
chocks when changing a wheel, see
“Lifting the vehicle” (
page 493).
Spare wheel
Warning!G
The dimensions of the spare wheel are
different from those of the road wheels. As
a result, the vehicle handling characteristics
change when driving with a spare wheel
mounted. Adapt your driving style accord-
ingly.
The spare wheel is for temporary use only.
When driving with a spare wheel mounted,
ensure proper tire inflation pressure and do
not exceed a vehicle speed of
50 mph (80 km/ h).
Drive to the nearest Mercedes-Benz Light
Truck Center as soon as possible to have the
spare wheel replaced with a regular road
wheel.
Never operate the vehicle with more than
one spare wheel mounted.
Do not switch off the ESP
® with a spare
wheel mounted.

472 Practical hints
Where will I find ...?
Your vehicle is equipped with a spare
wheel with collapsible tire. The spare
wheel is located underneath the cargo
compartment floor (
page 467).
Removing the spare wheel
1Retaining screw
2Spare wheel
3Vehicle tool kit storage well casing
Remove the jack from the vehicle tool
kit (
page 469).
Loosen retaining screw 1 by turning it
counterclockwise.
Turn vehicle tool kit storing well
casing3 by approximately 180°.
The electric air pump (
page 469)
points towards the rear.
Remove vehicle tool kit storage well
casing 3.
Remove spare wheel 2.
Reinstalling the spare wheel after use
There are two guide pins in the spare wheel
well that serve to hold the spare wheel in
place.1Guide pins
1Guide pins
2Spare wheel
iFor information on how to mount the spare
wheel, see “Mounting the spare wheel”
(
page 493).
iIf retaining screw 1 does not come loose,
turn vehicle tool kit storing well casing 3 slightly
counterclockwise. Retaining screw 1 should
then come loose easily.

473 Practical hints
Where will I find ...?
Place spare wheel 2 into spare wheel
well.
Make sure spare wheel 2 is placed
precisely on guide pins 1.
Insert vehicle tool kit storage well
casing 3 (
page 472) into spare
wheel 2.
The electric air pump (
page 469)
must point to the rear.
Turn vehicle tool kit storing well
casing3 (
page 472) by approxi-
mately 180°.
The electric air pump (
page 469)
points in direction of travel.
Fasten retaining screw 1
(
page 472) by turning it clockwise.
Insert the jack into the vehicle tool kit
storage well casing (
page 469).
Close and pull tight the hook and
loop fastener that secures the
jack (
page 469).
iThe vehicle tool kit storage well casing
should now be positioned according to mounting
direction indicators 3 (
page 469).

474 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.
Slide mechanical key2 out of the
housing.Unlocking the driver’s door
Insert mechanical key 2 into the
driver’s door lock until it stops.
Turn mechanical key 2 counterclock-
wise to position1 and hold it there.
Pull the door handle until the locking
knob moves up.
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

475 Practical hints
Unlocking / locking in an emergency
Locking the vehicle
If you cannot lock the vehicle with the
SmartKey or KEYLESS-GO*, lock the
vehicle 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 127).
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 119).
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.


476 Practical hints
Unlocking / locking in an emergency
Insert a suitable object such as a coin
into the slot of lock1.
Turn lock1 counterclockwise by 90°
in direction of arrow.
Remove cover2.
3Fuel filler flap release
Pull red fuel filler flap release 3 in
direction of arrow.
The fuel filler flap is unlocked.
Open the fuel filler flap (page 352).


477 Practical hints
Resetting activated head restraints
Resetting activated head restraints
If the active head restraints have been
triggered 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
another rear-end collision.
You can tell that the active head restraints
have been activated when they have been
moved forward and cannot be adjusted.
Vehicles without Rear Seat Entertain-
ment Package*1Pull
2Adjust downward
3Press
Pull the top of the head restraint cush-
ion in direction of arrow 1 as far as it
will go.
Adjust the head restraint cushion
downward in direction of arrow 2 as
far as it will go.
Firmly press the top of the active head
restraint cushion towards the head
restraint cover in direction of arrow 3
until it engages.
Warning!G
For safety reasons, have the active head
restraints checked by an authorized
Mercedes-Benz Light Truck Center after a
rear-end collision.
Warning!G
When pushing back the head restraint
cushion, take care that your fingers do not
become 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.


478 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 restraints” (
page 86).
For information on head restraint adjust-
ment, see “Seats” (
page 128).
Vehicles with Rear Seat Entertainment
Package*
Take the reset tool out of the
Mercedes-Benz vehicle literature
pouch.1Reset tool
2Active head restraint
1Reset tool
2Active head restraint
3Opening
Guide reset tool1 into rectangular
opening 3 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.
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 restraints” (
page 86).
For information on head restraint adjust-
ment, see “Seats” (
page 43).


479 Practical hints
Replacing SmartKey batteries
Replacing SmartKey batteries
If the batteries in the SmartKey or the
SmartKey with KEYLESS-GO* 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 474).
1Mechanical key
2Battery compartment
Insert mechanical key 1 into opening.
Press mechanical key 1 in direction of
arrow.
The battery compartment is unlatched.
Pull battery compartment 2 out of the
SmartKey housing.
3Batteries
4Contact springs
Pull out batteries3.
Using a line-free cloth, insert new bat-
teries 3 under contact springs 4 with
the positive terminal (+) side facing up.
Return battery compartment 2 into
housing until it locks into place.
Slide mechanical key 1 back into
SmartKey.
Check the operation of the SmartKey
or SmartKey with KEYLESS-GO*.
Warning!G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen inserting 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.