MERCEDES-BENZ C320 2005 W203 Owner's Manual

339 Practical hints
Unlocking/locking in an emergency
1Locking
Insert the mechanical key into the
driver’s door lock until it stops.

Turn the mechanical key clockwise to
position1.
The driver’s door is locked.
Fuel filler flap
In case the central locking system does
not release the fuel filler flap, you can open
it manually.
The release button is on the right-hand
side of the luggage compartment behind
the side trim.1Side trim
2Release button

Open the trunk lid.

Remove the side trim1 from the
right-hand side of the luggage compart-
ment.

Turn release button2 clockwise as far
as will go.
The fuel filler flap is released.

Open the fuel filler flap from outside.
Warning!
G
If you operate the emergency release but-
ton, be careful of the sharp edges so that
you do not injure yourself.

340 Practical hintsUnlocking/locking in an emergencyManually unlocking the transmission gear selector lever
In the case of power failure the transmis-
sion gear selector lever can be manually
unlocked, e.g. to tow the vehicle.
Slide out the swiveling cup holder
(page 243).
1Tool

Insert a tool1 (e.g. flat blade
screwdriver) into the opening.

Perform the following two steps
simultaneously:
Press tool1 forward in the
direction of the arrow.

Move gear selector lever from
positionP.

Remove tool1 from the opening.iThe gear selector lever is locked again
when moving it to positionP.

341 Practical hints
Opening/closing in an emergency
Opening/closing in an emergency
Power tilt/sliding sunroof*
You can open or close the tilt/sliding
sunroof manually should an electrical
malfunction occur.
The tilt/sliding sunroof drive is located
behind the lens1 of the interior overhead
light.
Remove SmartKey from the starter
switch.

Pry of lens1 using a flat blade
screwdriver.

Slide both locking tabs2 in direction
of the arrows.

Lower the rear of the cover and
remove.

Remove the cover.

Take the crank3 out of the Operator’s
Manual pouch.

Insert crank3 through hole on the left
side.

Turn crank3 clockwise to:

slide sunroof closed


raise sunroof at the rear

Turn crank3 counterclockwise to:

slide sunroof open


lower sunroof at the rear
iDo not disconnect electrical
connectors.
iTurn crank3 slowly and smoothly.
The tilt/sliding sunroof must be
synchronized after being operated
manually (
page 230).

342 Practical hintsReplacing SmartKey batteriesIf the batteries in the SmartKey are
discharged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced 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.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
Center.

343 Practical hints
Replacing SmartKey batteries
SmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key
(page 337).
1Mechanical key
2Battery compartment

Insert mechanical key1 in side
opening and push grey slide.
Battery compartment2 is unlatched.

Pull battery compartment2 out of the
housing in direction of arrow.

Remove the batteries.
3Battery
4Contact spring

Using a lint-free cloth, insert new
batteries3 under contact spring4
with the plus (+) side facing up.

Return battery compartment2 into
housing until it locks into place.

Slide mechanical key1 back into the
SmartKey.

Check the operation of the SmartKey.

344 Practical hintsReplacing bulbsSafe vehicle operation depends on proper
exterior lighting and signaling. It is there-
fore essential that all bulbs and lamp
assemblies 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 Center for headlamp
adjustment.
Bulbs
iIf the headlamps or front fog lamps are
fogged up on the inside as a result of
high humidity, driving the vehicle a
distance with the lights on should clear
up the fogging.iSubstitute bulbs will be brought into
use when lamps malfunction. Observe
the messages in the multifunction
display (
page 323)

345 Practical hints
Replacing bulbs
Front lamps Rear lamps
Lamp
Type
1
Additional turn signal
lamp
LED
2
Halogen headlamp:
Turn signal lamp
Bi-Xenon* headlamp:
Turn signal lamp
1156 A
2357 A
3
Halogen headlamp:
Low beam
Bi-Xenon* headlamp:
Low and high beam
1
1Vehicles with Bi-Xenon* headlamps: Low beam
and high beam use the same D2S-35W lamp. Do
not replace the Xenon bulbs yourself. See an
authorized Mercedes-Benz Center.
H7 (55 W)
D2S-35 W
Lamp
Type
4
Halogen headlamp:
High beam/high beam
flasher
Bi-Xenon* headlamp:
High beam flasher
H7 (55 W)
H7 (55 W)
Parking and standing
lamp
W5W
5
Front fog lamp
HB4/9006
(55 W)
6
Side marker lamp
W5W
Lamp
Type
7
High mounted brake
lamp
LED
8
Brake lamp
P21W
9
Turn signal lamp
PY 21 W
a
Parking and side
marker lamp
P 21/5 W
b
Backup lamp
P21W
c
License plate lamps
C5W
d
Rear fog lamp (driver’s
side only), tail and
standing lamp
P 21/4 W

346 Practical hintsReplacing bulbs
Notes 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, visit an authorized
Mercedes-Benz Center.Have the LEDs and bulbs for the following
lamps replaced by an authorized
Mercedes-Benz Center:


Additional turn signals in the exterior
rear view mirrors


High mounted brake lamp


Xenon* lamps


Front fog lamps
Warning!
G
Bulbs and bulb sockets can be very hot.
Allow 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.
iHave the headlamp adjustment
checked regularly.

347 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
positionM (
page 109).

Open the hood (
page 278) (except
for side marker lamps).
Halogen headlamp
1Housing cover for low beam headlamp
2Housing cover for high beam head-
lamp, parking and standing lamp3Bulb socket for turn signal lamp bulb
4Bulb socket for low beam bulb
5Bulb socket for high beam bulb
6Bulb socket for parking and standing
lamp bulbLow beam bulb

Press the clamp on housing cover1
and remove it.

Pull the electrical connector off.

Turn bulb socket4 counterclockwise
and take out the bulb.

Insert the new bulb so that its socket
locates in the recess of the lamp
housing.

Turn bulb socket4 clockwise until it
engages.

Plug the electrical connector onto the
bulb.

Align housing cover1 and press until
it engages.

348 Practical hintsReplacing bulbsHigh beam bulb
Press the clamp on housing cover2
and remove it.

Pull the electrical connector off.

Turn bulb socket5 counterclockwise
and take out the bulb.

Insert the new bulb so that its socket
locates in the recess of the lamp
housing.

Turn bulb socket5 clockwise until it
engages.

Plug the electrical connector onto the
bulb.

Align housing cover2 and press until
it engages.Front turn signal lamp bulb

Turn bulb socket3 with the bulb
counterclockwise and remove it.

Press gently onto the bulb and turn it
counterclockwise out of bulb
socket3.

Press new bulb gently into bulb
socket3 and turn clockwise until it
engages.

Place bulb socket3 back into the
lamp and turn it clockwise.Parking and standing lamp bulb

Press the clamp on housing cover2
and remove it.

Pull out bulb socket6 with the bulb.

Pull the bulb out of bulb socket6.

Press the new bulb into bulb socket6.

Press bulb socket6 back into the
lamp.

Align housing cover2 and press until
it engages.