MERCEDES-BENZ S-Class 2008 W221 Comand Manual

710 Practical hintsResetting activated head restraintsIf the active head restraints (front seats)
have been triggered in an accident, the ac-
tive head restraints must be reset. Other-
wise, the active head restraints cannot
offer any additional protection in the event
of another rear-end collision.
You can tell that the head restraints have
been triggered when they have been
moved forward and cannot be adjusted.
For information on active head restraints,
see “Active head restraints” (
page 56).
For information on head restraint adjust-
ment, see “Head restraints” (page 379).
Head restraints (standard)
1Fold back
2Push down
3Push back
Push the head restraint cushion by the
bottom, back as far as it will go1.

Push the head restraint cushion down
into the guide as far as it will go2.

Fold the head restraint cushion by the
top, back firmly until it engages3.

Repeat this procedure on the active
head restraints for second head re-
straint.
i
For your convenience, we recommend that
you have this work carried out by an authorized
Mercedes-Benz Center.
You will find the reset tool for manually operating
the head restraints in the Mercedes-Benz vehicle
literature pouch.Warning!
G
For safety reasons, have the active head
restraints checked by an authorized
Mercedes-Benz 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.

711 Practical hints
Resetting activated head restraints
Luxury head restraints*
Take reset tool1 out of the
Mercedes-Benz vehicle literature
pouch.

Guide reset tool1 into center of head
restraint between head restraint cush-
ion and rear head restraint cover.

Press reset tool1 forward in direction
of arrow.

Press reset tool downward until you
hear the head restraint release
mechanism audibly engage.

Pull out reset tool1.

Firmly press head restraint cushion
backward towards the rear of the vehi-
cle until it engages.

Repeat this procedure on the active
head restraints for second head re-
straint.
!
Be careful not to damage upholstery.

712 Practical hintsReplacing SmartKey batteriesIf the batteries in the SmartKey/SmartKey
with KEYLESS-GO* are discharged, the ve-
hicle can no longer be locked or unlocked.
It is recommended to have the batteries re-
placed at an authorized Mercedes-Benz
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 out of the
SmartKey/SmartKey with
KEYLESS-GO* (
page 708).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
housing.
Warning!
G
Batteries contain poisonous and corrosive
substances. Therefore keep the batteries
out of reach of children.
If a battery is swallowed, seek medical help
immediately.Warning!
G
SmartKey batteries contain Perchlorate ma-
terial, which may require special handling
and regard for the environment. Check with
your local government’s disposal guidelines.
California residents, see
http://www.dtsc.ca.gov/HazardousWaste
/Perchlorate/index.cfm.
i
When inserting the batteries, make sure
they are clean and free of lint.
i
When changing batteries, always replace
both batteries.
The required replacement batteries are available
at any authorized Mercedes-Benz Center.

713 Practical hints
Replacing SmartKey batteries
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 the mechanical key back into the
SmartKey/SmartKey with
KEYLESS-GO*.

Check the operation of the SmartKey/
SmartKey with KEYLESS-GO*.

714 Practical hintsReplacing bulbsSafe 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. Contact an autho-
rized Mercedes-Benz Center for headlamp
adjustment.
i
If 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.
i
Substitute bulbs will be brought into use
when the following lamps malfunction:


Brake lamps


Rear fog lamps


Front parking lamps


Tail lamps


Turn signal lamps
Read and observe messages in the multifunction
display (
page 642).

715 Practical hints
Replacing bulbs
Bulbs Front lamps Rear lamps
Lamp
Type
1
Bi-Xenon headlamp:
Low and high beam
lamp
1
1Bi-Xenon headlamps: Low beam and high beam
use the same D1S-35W lamp. Do not replace the
Bi-Xenon bulbs yourself. Contact an authorized
Mercedes-Benz Center.
D1S-35 W
2
Additional turn signal
lamp
LED
3
Parking and standing
lamp
W5W
4
Side marker lamp
W5W
5
Bi-Xenon headlamp:
High beam flasher lamp
H7-55 W
IR emitter* (for Night
View Assist*)
H11-55 W
6
Corner-illuminating
lamp
H7-55 W
7
Fog lamp
H11-55 W
8
Turn signal lamp
PY 24 W
Lamp
Type
9
High mounted brake
lamp
LED
a
Turn signal lamp
HiP 16 W
b
Brake lamp/tail lamp
and standing lamp
LED
c
License plate lamp
W5W
d
Backup lamp
HiP 16 W
e
Side marker lamp
LED
f
Rear fog lamp (driver’s
side only)
HiP 19 W

716 Practical hintsReplacing bulbsNotes on bulb replacement


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


Switch 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 Center.
Have the LEDs and bulbs for the following
lamps replaced by an authorized
Mercedes-Benz Center:


the Bi-Xenon lamps


the front turn signal lamps


the front fog lamps


the additional turn signal lamps in the
exterior rear view mirrors


the parking and standing lamps


the front side marker lamps


the high mounted brake lamps


the brake, tail and rear standing lamps


the rear side marker lamps


the rear fog lamp


the rear turn signal lamps


the rear side marker lamps


the license plate lamps
Warning!
G
Bulbs and bulb sockets can be very hot. Al-
low the lamp to cool down before changing
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 LEDs yourself. You could
otherwise damage the LEDs or parts of the vehi-
cle. Only have the LEDs replaced by an autho-
rized Mercedes-Benz Center.
i
Have the headlamp adjustment checked
regularly.

717 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 M
(page 399).

Open the hood (
page 573).
1Cover 1
2Cover 2
3Cover 3Removing and installing washer fluid
reservoir on left-hand side
Vehicles with Airmatic*
You must remove the washer fluid reser-
voir in order to change the bulbs of the
front headlamp on the left-hand side. The
washer fluid reservoir is on the front
left-hand side of the engine compartment.
Washer fluid reservoir (example illustration
from S 550)1Retaining screwRemoving

Turn retaining screw1 counterclock-
wise.

Take washer fluid reservoir out of
mounting.

Place washer fluid reservoir to the side
and do not disconnect any wires or ca-
bles.
Installing

Guide washer fluid reservoir into
mounting so that the bottom retaining
lug slides into the rubber sleeve on the
longitudinal member.

Turn retaining screw1 clockwise.

718 Practical hintsReplacing bulbsBi-Xenon headlamps High beam flasher lamp
In vehicles with Bi-Xenon headlamps, you
can only change the halogen bulb for the
high-beam flasher lamp.
1Bulb holder
2Wire position
3Grip

Turn cover2 (
page 717) counter-
clockwise and remove it.

Turn bulb holder1 counterclockwise
until it disengages.

Take out bulb holder1.

Take bulb out of holder.

Insert new bulb into holder and press it
all the way down.
The tab of the bulb holder must be po-
sitioned on the upper left-hand side
and wire2 must point upward and to
the right for the left headlamp, down-
ward and to the left for the right head-
lamp.

Turn bulb holder clockwise until it en-
gages and grip3 is in a horizontal po-
sition.
Warning!
G
Do not remove the cover for the Bi-Xenon
headlamp. Because of high voltage in Xenon
lamps, it is dangerous to replace the bulb or
repair the lamp and its components. We rec-
ommend that you have such work done by a
qualified technician.

719 Practical hints
Replacing bulbs
IR emitter*
1Bulb holder
2Wire position
Turn cover2 (
page 717) counter-
clockwise and remove it.

Turn bulb holder1 counterclockwise
until it disengages.

Take out bulb holder1.

Press both catches on left and right
sides of bulb holder1 and take bulb
out of holder.

Insert new bulb into holder until it en-
gages.

Insert bulb holder1 into guide in
headlamp. Wire2 must point down-
ward and to the right.

Turn bulb holder1 clockwise until it
engages and wire2 points downward
and to the left.
Corner-illuminating lamp
1Bulb holder
2Grip
3Wire position

Turn cover3 (
page 717) counter-
clockwise and remove it.

Turn bulb holder1 counterclockwise
until it disengages.

Take out bulb holder1.

Take bulb out of holder.

Insert new bulb into holder and press it
all the way down.

Insert bulb holder1 into guide in
headlamp.
The tab of the bulb holder must be po-
sitioned on the upper left-hand side
and wire3 must point downward and
to the left for the left headlamp, up-
ward and to the right for the right head-
lamp.

Turn bulb holder1 clockwise until it
engages and grip2 is in a horizontal
position.