2001 MERCEDES-BENZ C320 Page 14

25 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Central locking system
Radio frequency and infrared remote control
The electronic main key has an integrated radio
frequency and infrared remote control.
Due to the extended operational range of the remote
control, it could be possible to unintentionally lock or
unlock the vehicle by pressing the transmit button. If
one of the transmit buttons is pressed, the battery check
lamp lights up brief ly – indicating that the batteries are
in order. See page 332 for checking batteries.
The vehicle doors, trunk and fuel filler flap can be
centrally locked and unlocked via remote control.
Opening and closing the windows and sliding/pop-up
roof can only be done with the infrared portion of the
remote control. Aim transmitter eye at a receiver (6
or 7), press and hold transmit button Œ or ‹,
seepage29.
With vehicle centrally locked, the trunk can also be
opened by using the remote control.
If the electronic key is inserted in starter switch, the
vehicle cannot be locked or unlocked, and the trunk lid
cannot be opened with the remote control.1Transmit button
‹ Locking
ΠUnlocking
Š Opening trunk (if not separately locked)
2Lamp for battery check (see page 332 for changing
batteries if it does not light up briefly)
3PANIC button
4Transmitter eye
5Locking tab for mechanical key
P80.35-2032-26
24
3
5
1

27 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Locking and unlocking with remote control
Unlocking:
Press transmit button Œ. All turn signal lamps blink
once to indicate that the vehicle is unlocked.
The remote control can be programmed for two kinds of
unlocking modes (see below):
Selective unlocking mode –
Press transmit button Œ once to unlock driver’s door
and fuel filler flap.
Press transmit button Πtwice to unlock all doors,
fuel filler flap, and trunk.
Global unlocking mode –
Press transmit button Πonce to unlock all doors,
fuel filler flap, and trunk.
Notes:
If the trunk was previously locked separately, it will
remain locked, see page 35.
The presently active unlocking mode (selective or
global) can only be determined by unlocking the vehicle
with the remote control (see below for changing mode).If within 40 seconds of unlocking with the remote
control, neither door or trunk is opened, the electronic
key is not inserted in the starter switch, or the central
locking switch is not activated, the vehicle will
automatically lock.
Locking:
Press transmit button ‹ once. All turn signal lamps
blink three times to indicate that the vehicle is locked. If
they do not blink three times, a door or trunk is not
properly closed.
Note:
If the vehicle cannot be locked or unlocked by pressing
the transmit button, then it may be necessary to change
the batteries in the electronic main key (if ok, battery
check lamp in electronic main key will light briefly
when pressing transmit button) or to synchronize the
remote control, see pages 332 and 334.
Choosing global or selective mode on remote control
Press and hold transmit buttons‹ andŒ
simultaneously for five seconds to reprogram the
remote control. Battery check lamp will blink two times
indicating the completed mode change.

28 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Opening the trunk
The trunk lid will swing open automatically. You should
always make sure there is sufficient clearance.
A minimum height clearance of 5.75 ft. (1.75 m) is
required to open the trunk lid.
Press transmit buttonŠ until trunk lid is open.Important!
Do not place remote control in trunk since trunk is
locked when the lid is closed if the vehicle is centrally
locked.
Notes:
If the trunk was previously locked separately, it will
remain locked, see page 35.

29 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Opening and closing windows and
sliding / pop-up roof from outside
(summer opening / convenience feature)
Aim transmitter eye of remote control at the door
receiver.
Summer opening:
The sliding / pop-up roof and all side windows can be
opened automatically.
Continue to press transmit button Πafter unlocking
the vehicle.
The windows and sliding/pop-up roof begin to open
after approximately 1 second.
To interrupt opening procedure, release transmit
button.
Convenience feature:
The sliding / pop-up roof and the side windows can be
closed.
Continue to press transmit button ‹ after locking
the vehicle.
The windows and sliding / pop-up roof begin to close
after approximately 1 second.To interrupt closing procedure, release transmit button.
Ensure that all side windows and the sliding / pop-up
roof are properly closed before leaving the vehicle.
Note:
If the windows and sliding / pop-up roof cannot be
operated automatically by pressing the transmit button
of t he r emo te c ontr ol then it m ay be n ece ssar y to chan ge
the batteries in the electronic main key (if ok, battery
check lamp in electronic main key will light briefly
when transmitting), or to synchronize the remote
control, see page 332 and 334.
Wa r n i n g !
Never operate the windows or sliding / pop-up roof
if there is the possibility of anyone being harmed
by the opening or closing procedure.In case the procedure causes potential danger, the
procedure can be immediately halted by releasing
the remote control button. To reverse direction of
movement press Œ for opening or ‹ for
closing.

30 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Panic button
To activate press and hold button (1) for at least one
second. An audible alarm and blinking exterior lamps
will operate for approximately 3 minutes.
To deactivate press button (1) again, or insert electronic
key in starter switch.Note:
For operation in the USA 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 interference, and
(2) this device must accept any interference received,
including interference that may cause undesired
operation.
Any unauthorized modification to this device could void
the user’s authority to operate the equipment.
Mechanical keys
The mechanical keys work only in driver’s door, trunk,
and storage compartment locks.
Notes:
The mechanical key does not operate the central locking
system or antitheft alarm system.
The fuel filler flap cannot be locked or unlocked with
the mechanical key.
If the fuel filler flap cannot be opened, see page 335.
P80.35-2035-26
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34 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Automatic central locking
Wit h t he autom ati c c entral lockin g s ystem ac ti vate d, t he
doors and trunk are locked at vehicle speeds of
approximately 9 mph (15 km / h) or more. The fuel filler
flap remains unlocked.
The automatic central locking function can be switched
on or off. See page 111 for “Individual settings”.
Notes:
If doors are unlocked with the central locking switch
after activating the automatic central locking, and
neither door is opened, then the doors remain unlocked
even at vehicle speeds of approximately 9 mph
(15 km / h) or more.
If a door is opened from the inside at speeds of
approximately 9 mph (15 km / h) or less with the
automatic central locking activated, the door will again
be automatically locked at speeds of approximately
9 mph (15 km / h) or more.Important!
When towing the vehicle, or with the vehicle on a
dynamometer test stand, please, note the following:
With the automatic central locking activated and the
electronic key in starter switch position 2, the vehicle
doors will lock if the left front wheel as well as the right
rear wheel spin at vehicle speeds of approximately
9 mph (15 km / h) or more.
To prevent the vehicle door locks from locking,
deactivate the automatic central locking. See page 111
for “Individual settings” - “VEHICLE”.
Emergency unlocking in case of accident
The doors unlock automatically a short time after an
accident in which an airbag or emergency tensioning
retractor deploys (this is intended to aid rescue and
exit).

35 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Trunk
The lock is located next to the recessed handle.
When the trunk is separately locked, it remains locked
when centrally unlocking the vehicle.
To deny any unauthorized person access to the trunk,
lock it separately with the mechanical key. Leave only
the electronic main key less its mechanical key with the
vehicle.
Notes:
In case of a malfunction in the central locking system
the trunk can be unlocked individually.
To unlock and open the trunk lid, turn mechanical key
to position 2, hold and push to open.
The mechanical key does not operate the central locking
system or antitheft alarm system.
When unlocking the trunk with the mechanical key, the
exterior lamps will flash and the alarm will sound.
To cancel the alarm, insert the electronic key in the
starter switch or press buttonŒ or‹ on the
electronic main key.
If the fuel filler flap cannot be opened, see page 335.0Neutral position
1Separate locking of trunk – remove mechanical key
in this position.
2Unlocking
Important!
Do not p lac e m echan ical key in sid e tr un k , s in ce tr unk is
locked again when closing the lid if the vehicle has been
previously centrally locked.

37 Central locking system
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Trunk lid release switch
The switch is located on the driver’s door.The trunk lid will swing open automatically. You should
always make sure there is sufficient clearance.
A minimum height clearance of 5.75 ft. (1.75 m) is
required to open the trunk lid.
To open the trunk, the vehicle must be at standstill.
Press switch until trunk lid is open.
The indicator lamp in the switch remains on with trunk
lid open.
Notes:
The trunk can also be opened by using the remote
control. Press Šbutton.
The trunk lid cannot be opened by the switch or the
remote control when previously locked separately with
the mechanical key. To open, see page 35.
The trunk lid cannot be opened with the trunk lid
release switch when the vehicle was previously locked
with the remote control. To unlock vehicle with the
remote control, see page 25.