2008 MERCEDES-BENZ C300 Unlock doors

Contents
Controls in detail............................... 69
Locking and unlocking ......................... 70
SmartKey ....................................... 70
SmartKey with KEYLESS-GO*
(Canada only) ................................. 73
Checking batteries in the SmartKey
or SmartKey with KEYLESS-GO*
(Canada only) ................................. 78
Loss of the SmartKey or SmartKey
with KEYLESS-GO* (Canada only) .. 79
Opening doors from the inside ....... 79
Automatic central locking .............. 80
Locking and unlocking
from the inside ............................... 81
Starter switch positions ....................... 82
SmartKey ....................................... 82
SmartKey with KEYLESS-GO*
(Canada only) ................................. 83
Seats.................................................... 85
Seat adjustment ............................. 85
Lumbar support .............................. 91
Seat heating* ................................. 91Steering wheel ..................................... 93
Steering wheel adjustment,
manual ........................................... 93
Steering wheel adjustment,
electrical* (Canada only)................ 94
Easy-entry/exit feature*
(Canada only) ................................. 95
Mirrors ................................................. 97
Interior rear view mirror ................. 97
Exterior rear view mirrors............... 97
Power folding
exterior rear view mirrors* ............. 98
Interior rear view mirror,
antiglare position ........................... 99
Auto-dimming rear view mirrors* . 100
Activating exterior rear view mirror
parking position* (Canada only)... 101
Memory function* (Canada only) ....... 102
Storing positions into memory* ... 103
Recalling positions from memory* 103
Storing exterior rear
view mirror parking position*....... 104
Fastening the seat belts .................... 105
Proper use of seat belts ............... 106
Seat belt height adjustment ......... 107Lighting ............................................. 108
Exterior lamp switch .................... 108
Switching on high beams ............. 112
Headlamp cleaning system* ........ 112
Corner-illuminating front
fog lamps* (With Bi-Xenon*
headlamps only)........................... 112
Hazard warning flasher ................ 114
Interior lighting ............................ 114
Door entry lamps ......................... 116
Trunk lamp ................................... 116
Windshield wipers ............................. 117
Switching on/off
windshield wipers ........................ 118
Single wipe .................................. 118
Intermittent wiping ...................... 118
Wiping with
windshield washer fluid................ 119
Power windows ................................. 120
Opening and closing
power windows ............................ 120
Summer opening feature ............. 123
Convenience closing feature ........ 124

21 At a glance
Exterior view
ItemPage
1Trunk

Unlocking

Opening and closing

Minispare wheel

Vehicle tool kit
269
269
441
420
2Rear lamps431
3Rear window, defrosting265
4Fuel filler flap
Refueling
Gasoline322
322
481
5Doors

Locking and unlocking

Opening and closing

Unlocking/locking in an
emergency
70
70
424
6Exterior rear view mirror

Adjusting97
ItemPage

Auto-dimming rear view
mirrors*

Power folding exterior rear
view mirrors*

Parking position*
(Canada only)
97
100
98
101
7Tires and wheels

Checking tire inflation
pressure

Tire Pressure Monitoring
System (TPMS), (USA only)

Run Flat Indicator (Canada
only)

General information

Minispare wheel

Flat tire
331
341
344
342
331
422
440
8Towing the vehicle
Installing towing eye bolt453
455
ItemPage
9Headlamp cleaning system*112
aFront lamps431
bHood, opening
Engine oil
Coolant
Battery325
327
329
446
cWindshield wipers
Wiper blades, replacing
Wiper blades, cleaning117
438
368
dWindshield
Front window, defrosting
Cleaning with wiper fluid
Cleaning
264
119
368
eRoofs

Power tilt/sliding sunroof

Panorama roof with power
tilt/sliding panel*
273
276

57 Safety and Security
Occupant safety
Blocking of rear door window operation
With the override switch you can disable
the rear side window switches in the rear
door panels.
1Indicator lamp
2Override switch
Activating: Press override switch2.
Indicator lamp1 comes on.
The rear door windows can no longer
be operated using the respective
switch located in the rear doors.
Deactivating: Press override
switch2 again.
Indicator lamp1 goes out.
The rear door windows can again be
operated using the respective switch
located in the rear doors.
For more information on power windows,
see the “Controls in detail” section
(
page 120).
Warning!G
Activate the override switch when children
are riding in the back seats of the vehicle.
The children may otherwise injure them-
selves, e.g. by becoming trapped in the win-
dow opening.
When leaving the vehicle, always remove the
SmartKey or SmartKey with KEYLESS-GO*
(Canada only) from the starter switch, take
it with you, and lock your vehicle. Do not
leave children unattended in the vehicle, or
with access to an unlocked vehicle. A child’s
unsupervised access to a vehicle could re-
sult in an accident and/or serious personal
injury.
iOperation of the rear door windows with the
switches located in the driver’s door is still
possible.

70 Controls in detail
Locking and unlocking
SmartKey
Your vehicle comes supplied with two
SmartKeys, each with remote control and
a removable mechanical key.
The SmartKey provides an extended oper-
ating range. To prevent theft, however, it is
advisable to only unlock the vehicle when
you are in close proximity to it.
The SmartKey centrally locks and unlocks,
when set to factory settings (
page 71):

the doors

the trunk

the fuel filler flap
SmartKey with remote control
1‹ Lock button
2ŠOpening button for trunk
(
page 269)
3Mechanical key locking tab
4ŒUnlock button
5Battery check lamp
6ÂPanic button (
page 58)
!To prevent possible malfunction, avoid ex-
posing the SmartKey to high levels of electro-
magnetic radiation.
Warning!G
When leaving the vehicle, always remove the
SmartKey from the starter switch, take it
with you, and lock the vehicle. Do not leave
children unattended in the vehicle, or with
access to an unlocked vehicle. A child’s
unsupervised access to a vehicle could
result in an accident and/or serious person-
al injury.
Warning!G
To prevent possible personal injury, always
keep hands and fingers away from the door
or trunk lid opening when closing a door or
the trunk. Be especially careful when small
children are around.
Before closing doors, make sure there is no
possibility of someone getting caught in a
door during closing.

71 Controls in detail
Locking and unlocking
Factory setting
Global unlocking: Press buttonŒ.

All turn signal lamps flash once.

An acoustic signal sounds once.

The locking knobs in the doors
move up.

The anti-theft alarm system is dis-
armed.

The locator lighting will also come
on if it is dark and the feature is ac-
tivated in the control system
(
page 172).
iUSA only:
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interfer-
ence, and
(2) this device must accept any interference re-
ceived, including interference that may
cause undesired operation.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iCanada only:
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
(1) This device may not cause interference, and
(2) this device must accept any interference re-
ceived, including interference that may
cause undesired operation of the device.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iYou can also open and close the door win-
dows and tilt/sliding sunroof, or the panorama
roof with power tilt/ sliding panel* using the
SmartKey (
page 123).
!If you cannot lock or unlock the vehicle with
the SmartKey, then either the batteries in the
SmartKey are discharged, the SmartKey is mal-
functioning or the vehicle batteries are drained.

Check the batteries in the SmartKey and re-
place them if necessary (
page 428).

Use the mechanical key to unlock the driv-
er’s door (
page 424) and trunk
(
page 425).

Use the mechanical key to lock and trunk
(
page 272).

Have the vehicle batteries and their connec-
tions checked (
page 446).
If the SmartKey is malfunctioning, contact
Roadside Assistance or an authorized
Mercedes-Benz Center.
iYour vehicle is equipped with an acoustic
lock and unlock confirmation signal feature. An
acoustic signal will sound when the vehicle is
locked or unlocked using the SmartKey.
If you wish to activate or deactivate the feature,
or adjust its signal volume, contact an authorized
Mercedes-Benz Center.

72 Controls in detail
Locking and unlocking
The vehicle will lock again automatically
and rearm the anti-theft alarm system
within approximately 40 seconds of un-
locking if:

neither a door nor the trunk is opened

the SmartKey is not inserted in the
starter switch

the central locking/unlocking switch is
not activated
Global locking: Press button‹.
With the trunk and doors closed:

All turn signal lamps flash three
times.

An acoustic signal sounds three
times.

The locking knobs in the doors
move down.

The anti-theft alarm system is
armed.Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey so that press-
ing buttonŒ only unlocks the driver’s
door and the fuel filler flap.
Press and hold buttonsŒ and‹
simultaneously for about 6 seconds un-
til battery check lamp5 (
page 70)
flashes twice.
The SmartKey will then function as fol-
lows:
Unlocking driver’s door and fuel fill-
er flap: Press buttonΠonce.

All turn signal lamps flash once.

An acoustic signal sounds once.

The locking knob in the driver’s
door moves up.

The anti-theft alarm system is dis-
armed.

The locator lighting will also come
on if it is dark and the feature is ac-
tivated in the control system
(
page 172).
Global unlocking: Press buttonŒ
twice.

All turn signal lamps flash once.

An acoustic signal sounds once.

The locking knobs in the doors
move up.

The anti-theft alarm system is dis-
armed.

The locator lighting will also come
on if it is dark and the feature is ac-
tivated in the control system
(
page 172).

73 Controls in detail
Locking and unlocking
Global locking: Press button‹.
With the trunk and doors closed:

All turn signal lamps flash three
times.

An acoustic signal sounds three
times.

The locking knobs in the doors
move down.

The anti-theft alarm system is
armed.
Restoring to factory setting: Press
and hold buttonsŒ and‹ si-
multaneously for about 6 seconds until
battery check lamp5 (
page 70)
flashes twice.SmartKey with KEYLESS-GO*
(Canada only)
Vehicles equipped with KEYLESS-GO come
with two SmartKeys with KEYLESS-GO,
each with remote control and a removable
mechanical key.
The KEYLESS-GO function is integrated
into the SmartKey. On these vehicles, the
validity of the SmartKey with KEYLESS-GO
is checked every time you grasp an outside
door handle.
With the KEYLESS-GO function, you can
lock and unlock the vehicle without using
the remote control buttons on the
SmartKey and start the engine without in-
serting the SmartKey in the starter switch.
The SmartKey with KEYLESS-GO centrally
locks and unlocks, when set to factory set-
tings (
page 76):

the doors

the trunk

the fuel filler flap
SmartKey with KEYLESS-GO
1‹ Lock button
2ŠOpening button for trunk
(
page 269)
3Locking tab for mechanical key
4ΠUnlock button
5Battery check lamp
6ÂPanic button (
page 58)
iWhen any outside door handle other than
the driver’s outside door handle is grasped, the
vehicle is always centrally unlocked.
!To prevent possible malfunction, avoid ex-
posing the SmartKey with KEYLESS-GO to high
levels of electromagnetic radiation.

74 Controls in detail
Locking and unlocking
Warning!G
When leaving the vehicle, always take the
SmartKey with KEYLESS-GO* with you and
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an
unlocked vehicle. A child’s unsupervised ac-
cess to a vehicle could result in an accident
and/or serious personal injury.
They could start the vehicle with a valid
SmartKey with KEYLESS-GO left in the vehi-
cle or with the KEYLESS-GO button on the
starter switch, or they could release the
parking brake, thereby putting themselves
and others in danger. Switch off the engine
and take the SmartKey with KEYLESS-GO
with you even if you are only leaving the ve-
hicle for a short while.
Warning!G
To prevent possible personal injury, always
keep hands and fingers away from the door
or trunk lid opening when closing a door or
the trunk. Be especially careful when small
children are around.
Before closing doors, make sure there is no
possibility of someone getting caught in a
door during closing.
iUSA only:
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interfer-
ence, and
(2) this device must accept any interference re-
ceived, including interference that may
cause undesired operation.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iCanada only:
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
(1) This device may not cause interference, and
(2) this device must accept any interference re-
ceived, including interference that may
cause undesired operation of the device.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iYou can also open and close the door win-
dows and tilt/sliding sunroof, or the panorama
roof with power tilt/ sliding panel* using the
SmartKey with KEYLESS-GO (
page 123).
!If you cannot lock or unlock the vehicle with
the SmartKey with KEYLESS-GO, then either the
batteries in the SmartKey with KEYLESS-GO are
discharged, the SmartKey with KEYLESS-GO is
malfunctioning or the vehicle batteries are
drained.

Check the batteries in the SmartKey with
KEYLESS-GO and replace them if necessary
(
page 428).