2004 MERCEDES-BENZ C320 COUPE lock

290 Practical hintsUnlocking/locking in an emergencyChanging batteries in the SmartKey
If the batteries in the SmartKey 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 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.1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.

Remove mechanical key1
(page 288).

Insert mechanical key1 in side open-
ing and push grey slide.
The battery compartment is unlatched.

Pull the battery compartment out of the
key housing in direction of arrow.
3Battery
4Contact spring

Remove the batteries.

Using a lint-free cloth, insert new bat-
teries under the contact spring with the
plus (+) side facing up.
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen changing batteries, always re-
place both batteries.
The required replacement batteries are
available at any Mercedes-Benz
Center.

291 Practical hints
Unlocking/locking in an emergency

Return battery compartment into hous-
ing until it locks in place.

Slide mechanical key1 back into the
SmartKey.
Fuel filler flap
In case the central locking system does
not release the fuel filler flap, you can open
it manually.
Open the trunk lid.

Fold right-side tail lamp trim aside.

Reach inside through opening2.

Turn release knob1 clockwise (ar-
row).
The fuel filler flap can now be opened.
Manually unlocking the gear selector
lever
In the case of power failure the gear selec-
tor lever can be manually unlocked, e.g. to
tow the vehicle.
1Coin holder
2Tool

Open the storage compartment in front
of the center armrest.

Release coin holder1 (e.g. using a
small coin).

Swing coin holder1 aside.

Insert a tool2 (e.g. flat blade screw-
driver) into the opening.

Perform the following two steps simul-
taneously:
Push the tool down.

Move gear selector lever from
positionP.

Reinstall the coin holder after removing
the tool from the opening.
iWhen inserting the batteries, make
sure they are clean and free of lint.
iThe gear selector lever is locked again
when moving it to positionP.

292 Practical hintsOpening/closing in an emergency
Opening/closing in an emergencyPanorama sliding/pop-up roof
You can open or close the panorama slid-
ing/pop-up roof manually should an elec-
trical malfunction occur.
The panorama sliding/pop-up roof drive is
located behind the lens of the interior over-
head light.
Pry off lens1 using a flat blade screw-
driver.

Slide both locking tabs2 in direction
of arrow.

Lower rear of cover and remove.

Remove cover.

Obtain crank3.

Insert crank3 through hole.

Turn crank3 clockwise to:

slide roof closed


raise roof at the rear

Turn crank3 counterclockwise to:

slide roof open


lower roof at the rear
The panorama sliding/pop-up roof must be
resynchronized after being operated man-
ually (page 193).
iDo not disconnect electrical connec-
tors.

298 Practical hintsReplacing bulbsSide marker lamp bulb
Switch off the lights.

Carefully slide lamp towards rear.

Remove front end first.

Twist bulb socket counterclockwise
and pull out.

Pull bulb out of the bulb socket.

Insert new bulb in socket.

Reinstall bulb socket, push in and twist
clockwise.

To reinstall lamp, set rear end in
bumper and let front end snap into
place.
Replacing bulbs for rear lamps
Tail lamp assemblies
Switch off the lights.

Open the trunk lid (
page 85).

Turn handles2.

Remove the trim panel1.

Press together the latches1.

Remove bulb holder.

Gently push bulb into socket, turn
counterclockwise and remove.

Insert new bulb and reinstall bulb
socket.

Reinstall trim panel.

300 Practical hintsReplacing wiper blades
Replacing wiper bladesRemoving
Fold the wiper arm forward.
1Lock
2Unlock

Pull the tab in the direction of arrow2
and remove windshield wiper.
Installing
Slide the wiper blade into the cutout on
the wiper arm.

Slide the tab back in the direction of
arrow1 until it audibly engages.

Fold the wiper arm back to rest on the
windshield.
Warning!
G
For safety reasons, remove SmartKey from
starter switch before replacing a wiper
blade, otherwise the motor could suddenly
turn on and cause injury.
!Never open the hood when the wiper
arm is folded forward.
Hold onto the wiper when folding the
wiper arm back. If released, the force
of the impact from the tensioning
spring could crack the windshield.
Do not allow the wiper arms to contact
the windshield glass without a wiper
blade inserted.
Make certain that the wiper blades are
properly installed. Improperly installed
wiper blades may cause windshield
damage.
For your convenience, we recommend
that you have this work carried out by
an authorized Mercedes-Benz Center.

301 Practical hints
Flat tire
Flat tire
Preparing the vehicle
Park the vehicle as far as possible from
moving traffic on a hard surface.

Turn on the hazard warning flashers.

Engage the steering wheel lock in the
straight ahead position and set the
parking brake.

Move the gear selector lever toP (man-
ual transmission to 1st or reverse
gear).

Have any passenger exit the vehicle at
a safe distance from the roadway.
Mounting the spare wheel Preparing the vehicle
Prepare the vehicle as described under
“Preparing the vehicle” on this page.

Take the wheel wrench and the jack
out of wheel well below the trunk floor
(page 285).

Take the spare wheel out of the trunk
(page 285).
Lifting the vehicle

Prevent the vehicle from rolling away
by blocking wheels with wheel chocks
(not included) or other sizable objects.
When changing wheel on a level surface:

Place one chock in front of and one be-
hind the wheel that is diagonally oppo-
site to the wheel being changed.
Warning!
G
The dimensions of the spare wheel are dif-
ferent 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 spare wheel mounted, en-
sure proper tire pressure and do not exceed
vehicle speed of 50 mph (80 km/h).
Drive to the nearest Mercedes-Benz 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.

302 Practical hintsFlat tireWhen changing wheel on a hill:
Place chocks on the downhill side
blocking both wheels of the other axle.

Take the two-piece wheel wrench and
the jack out of the vehicle tool kit
(page 285). Assemble wheel wrench.

On wheel to be changed, loosen but do
not yet remove the wheel bolts (ap-
proximately one full turn with wrench).
The jack take-up brackets are located di-
rectly behind the front wheel housings and
in front of the rear wheel housings.1Jack
2Crank
3Take-up bracket

Place jack on firm ground.

Position jack1 under the take-up
bracket3 so that it is always vertical
(plumb-line) as seen from the side,
even if the vehicle is parked on an in-
cline.

Jack up the vehicle until the wheel is a
maximum of 1.2 in (3 cm) from the
ground. Never start engine while vehi-
cle is raised.
Warning!
G
The jack is designed exclusively for jacking
up the vehicle at the jack take-up brackets
built into both sides of the vehicle. To help
avoid personal injury, use the jack only to lift
the vehicle during a wheel change. Never
get beneath the vehicle while it is supported
by the jack. Keep hands and feet away from
the area under the lifted vehicle. Always
firmly set parking brake and block wheels
before raising vehicle with jack.
Do not disengage parking brake while the
vehicle is raised. Be certain that the jack is
always vertical (plumb line) when in use, es-
pecially on hills. Always try to use the jack
on level surface. make sure the jack arm is
fully seated in the jack take-up bracket. Al-
ways lower the vehicle onto sufficient ca-
pacity jackstands before working under the
vehicle.

306 Practical hintsFlat tireLowering the vehicle
Lower vehicle by turning crank coun-
terclockwise until vehicle is resting ful-
ly on its own weight.

Remove the jack.
1-5 Wheel bolts

Tighten the five wheel bolts evenly, fol-
lowing the diagonal sequence
illustrated (1 to 5), until all bolts are
tight. Observe a tightening torque of
80 lb-ft (110 Nm).

Before storing the jack in the trunk, it
should be fully collapsed, with handle
folded in.Warning!
G
Have the tightening torque checked after
changing a wheel. The wheels could come
loose if they are not tightened to a torque of
80 lb-ft (110 Nm).