2003 MERCEDES-BENZ C320 4MATIC trunk

285 Practical hints
Unlocking/locking in an emergency
Unlocking/locking in an emergency
Unlocking the vehicle
In case of a malfunction in the central lock-
ing system you can unlock the trunk sepa-
rately (
page 91).
Unlocking the driver’s door
If you are unable to unlock the driver’s
door using the SmartKey, open the door
using the mechanical key.
1Mechanical key locking tab
2Mechanical key

Move locking tab1 in direction of ar-
row and slide the mechanical key2 out
of the housing.
3Unlocked
4Locked

Unlock the door with the mechanical
key. To do so, push the mechanical key
in the lock until it stops and turn it to
the left3.
iUnlocking your vehicle with the me-
chanical key will trigger the anti-theft
alarm system. To cancel the alarm, do
one of the following:

Press button
Œ
or
‹
on the
SmartKey.


Insert the key in the starter switch.

286 Practical hintsUnlocking/locking in an emergencyLocking the vehicle
If you are unable to lock the vehicle with
the SmartKey, lock it with the mechanical
key as follows:
Close the passenger doors and the
trunk.

Press the central locking switch in the
cockpit (
page 92).

Check to see whether the locking
knobs on the passenger doors are still
visible. If necessary push them down
manually.

Lock the driver’s door with the me-
chanical key (
page 285).

Check if the trunk is locked. If neces-
sary lock the trunk with the mechanical
key (
page 90).
Changing batteries
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.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.

287 Practical hints
Unlocking/locking in an emergency
SmartKey
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove mechanical key1
(page 285).

Insert the mechanical key in side open-
ing and push gray slide.
The battery compartment2 is un-
latched.

Pull the battery compartment2 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.

Return battery compartment into hous-
ing until it locks into place.
Fuel filler flap
Open trunk lid.

Fold away right-side tail lamp trim.

Reach inside through opening2.

Turn release knob1 clockwise (arrow).
The fuel filler flap can now be opened.

295 Practical hints
Replacing bulbs
Replacing bulbs for rear lamps
Tail lamp assemblies
Switch off lights.

Open trunk lid.
1Locking lever

Fold trim to the side.

Turn locking lever1 to vertical position
and remove bulb carrier.2Rear fog lamp, driver’s side
3Back up lamp
4Stop lamp
5Turn signal lamp
6Tail, parking, standing and side marker
lamp

Gently push bulb into socket, turn
counterclockwise and remove.

Insert new bulb and turn clockwise.

Reinstall bulb socket.

Reinstall bulb holder and close trim
panel.License plate lamp
1Screw

Switch off the lights.

Loosen both screws1 and remove
lamp.

Replace the tubular lamp and reinstall
lamp.

Retighten the screws.

297 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 selector lever toP (manual
transmission to first or reverse gear).

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

Take the spare wheel out of the trunk
as described on (
page 281) (full size
tire spare wheel) or (page 282)
(Minispare wheel).
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
behind the wheel that is diagonally
opposite to the wheel being changed.
When 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 trunk (
page 279).
Assemble wheel wrench.
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 that the jack
arm is fully seated in the jack take-up
bracket. Always lower the vehicle onto suffi-
cient capacity jackstands before working
under the vehicle.


301 Practical hints
Flat tire
In the case of a flat tire, you may
temporarily use the Minispare wheel when
observing the following restrictions:

Do not exceed vehicle speed of 50 mph
(80 km/h).


Drive to the nearest tire repair facility
to have the flat tire repaired or
replaced as appropriate.


Do not operate vehicle with more than
one spare wheel mounted.Lowering the vehicle

Lower vehicle by turning crank
counterclockwise until vehicle is
resting fully on its own weight.

Remove the jack.
1-5 Wheel bolts

Tighten the five wheel bolts evenly,
following the diagonal sequence
illustrated (1to5), until all bolts are
tight. Observe a tightening torque
of 80 ft lb (110 Nm).

Before storing the jack in the trunk, it
should be fully collapsed, with handle
folded in (storage position)
(page 280).
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 ft lb (110 Nm).

313 Practical hintsFuses
Opening fuse box
4Fuse box cover
5Clamps
Release clamps5.

Remove cover4.
Closing fuse box

Ensure that the sealing rubber is prop-
erly positioned.

Press the cover4 down and secure
with clamps5.
Auxiliary fuse box in trunk
The auxiliary fuse box is located in the
trunk.
1Trim panel
2Cover of auxiliary fuse box
3Special fuse extractor
Opening
Pull away trim panel1.

Remove cover2.Spare fuses
Spare fuses are found in the vehicle tool kit
in the spare wheel well.

328 Technical dataWeights
WeightsRoof load max.
220 lb (100 kg)
Trunk load max.
220 lb (100 kg)