2003 MERCEDES-BENZ CLK320 CABRIOLET Owner's Manual

22 Central locking system
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Ve h i c l e k e y s
Included with your vehicle are 2 electronic keys with
integrated radio frequency and infrared remote controls
plus removable mechanical key.
The locking tabs for the mechanical key portion of the
two electronic keys are a different color to help
distinguish it.
Wa r n i n g !
When leaving the vehicle, always remove the
electronic key from the steering lock, and lock your
vehicle. Do not leave children unattended in the
vehicle, or with access to an unlocked vehicle.
Unsupervised use of vehicle equipment may cause
an accident and/or serious personal injury.

23 Central locking system
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and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Electronic key
The electronic key has an integrated radio frequency
and infrared remote control, plus removable mechanical
key.
The remote control (1) operates all locks on the vehicle.
The mechanical key (2) works only in the driver’s door,
trunk, and glove box lock.When using the mechanical key (2) for lock operations,
it can be removed by sliding it out of the remote control.
To do so, move locking tab (3) to the right and slide the
mechanical key (2) in direction of arrow (4).
The remote control transmitter is located in the
electronic key.
The infrared receivers are located in the door handles.
Obtaining replacement keys
Your vehicle is equipped with a theft deterrent locking
system requiring a special key manufacturing process.
For security reasons, replacement keys can only be
obtained from your authorized Mercedes-Benz Center.
P80.35-2031-26
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3
4
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24 Central locking system
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Start lock-out
Important!
Removing the electronic key from the steering lock
activates the start lock-out. The engine cannot be
started.
Inserting the electronic key in the steering lock
deactivates the start lock-out.
Note:
In case the engine cannot be started (vehicle’s battery is
in order), the system is not operational. Contact an
authorized Mercedes-Benz Center or call 1-800-FOR-
MERCedes (in the USA) or 1-800-387-0100 (in Canada).General notes on the central locking system
If the electronic key is inserted in the steering lock, the
vehicle cannot be locked or unlocked with the remote
control.
If the vehicle cannot be locked or unlocked:
•Aim transmitter eye at a receiver of either door
handle. Check the batteries of the electronic key, see
page 285, or synchronize the remote control, see
page 287.
•Use the mechanical key to unlock the driver’s door.
To start the engine, insert the electronic key in the
steering lock. There could be a slight delay until the
electronic key can be turned in the steering lock.
Important!
When unlocking the driver’s door with the mechanical
key, the exterior lamps will flash and the alarm will
sound.
To cancel the alarm, insert the electronic key in the
steering lock or press buttonŒ or‹ on the
electronic key.

25 Central locking system
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data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Central locking system
Radio frequency and infrared remote control
The electronic 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 briefly – indicating that the batteries are
in order. See page 285 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 remotely 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 ‹.
If the electronic key is inserted in steering lock, the
vehicle cannot be locked or unlocked with the remote
control.1Transmit button
‹ Locking
ΠUnlocking
Š Opening trunk
2Lamp for battery check (see page 285 for changing
batteries if it does not light up briefly)
3PANIC button
4Transmitter eye
5Locking tab for mechanical key
P80.35-2032-26
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26 Central locking system
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6Infrared receiver in driver’s door handle7Infrared receiver in passenger door handle
P80.30-2081-26
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P80.30-2082-20
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27 Central locking system
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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 o nce to un lock dr iver’s d oor
and fuel filler flap.
Press transmit button Πtwice to unlock both doors,
fuel filler flap, and trunk.
Global unlocking mode –
Press transmit button Πonce to unlock both doors,
fuel filler flap, and trunk.
Notes:
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 nor trunk is opened, the electronic
key is not inserted in the steering lock, 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 key (if ok, battery check
lamp in electronic key will light briefly when pressing
transmit button) or to synchronize the remote control,
see pages 285 and 287.

28 Central locking system
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Choosing global or selective mode on remote control
Press and hold transmit buttons ‹ and Œ
simultaneously for approx. 6 seconds to reprogram the
remote control. Battery check lamp will blink two times
indicating the completed mode change.
Opening the trunk
Press transmit buttonŠ until trunk lid is released.
A minimum height clearance of 5.9 ft. (1.8 m) is
required to open the trunk lid.Important!
Do not place remote control in trunk since trunk is
locked when the lid is closed if the vehicle is centrally
locked.

29 Central locking system
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data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Opening and closing windows from outside
Aim transmitter eye of remote control at a door receiver.
To o pen :
Continue to press transmit button Πafter unlocking
the vehicle.
The windows begin to open after approx. 1 second.
To interrupt opening procedure, release transmit
button.
To c lo se:
Continue to press transmit button ‹ after locking
the vehicle.
The windows begin to close after approx. 1 second.
To interrupt closing procedure, release transmit button.Note:
If the windows cannot be operated automatically by
pressing the transmit button of the remote control then
it may be necessary to change the batteries in the
electronic key (if ok, battery check lamp in electronic
key will light briefly when pressing transmit button), or
to synchronize the remote control, see page 285
and 287.
Wa r n i n g !
Never operate the windows 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.