2002 MERCEDES-BENZ C320 change key battery

33 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 41.
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 key (if ok, battery check
lamp in electronic key will light briefly when pressing
transmit button) or to synchronize the remote control,
see pages 357 and 359.
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.
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357 Electronic key
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Changing batteries in the electronic key
1Transmit buttons
2Lamp for battery check and function control
Checking batteries
If one of the transmit buttons (1) is pressed, the battery
check lamp (2) lights up briefly – indicating that the
batteries are in order.
Change batteries if the battery check lamp (2) does not
light up briefly.Changing batteries
Move locking tab (3) in direction of right arrow and
remove mechanical key (4, left arrow).
P 80.20-2201-26
1
2
P 80.35-2029-26
4
3
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358 Electronic key
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Insert mechanical key (4) in side opening (5) to open
latch. Press briefly (do not use mechanical key as lever)
to release battery compartment.
Remove mechanical key from side opening.
Carefully remove battery compartment in direction of
arrow (6).Change batteries (7), inserting new ones under contact
spring (8) with plus (+) side facing up.
Return battery compartment into housing until locked
in place and slide mechanical key back into electronic
key.
P 80.35-2025-26
5
4
6
P 80.35-2027-26
78
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390 Index
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car careIndex
BBabySmart
TM airbag deactivation system ..................... 70
Battery .............................................................................342
Block heater .................................................................... 270
Brake assist system (BAS) ............................................ 275
Bulbs
See Replacing bulbs ................................................. 351
CCD changer
See CD changer installed ......................................... 187
Cellular telephone ......................................................... 224
Center console .................................................................. 24
Central locking switch .................................................... 39
Central locking system ................................................... 31
Automatic central locking ......................................... 40
Central locking switch ............................................... 39
Choosing global or selective mode ........................... 33
Doors ............................................................................. 37
General notes ............................................................... 30
Locking and unlocking with remote control .......... 33
Mechanical keys .......................................................... 36
Obtaining replacement keys ..................................... 29Summer opening/convenience feature ...................35
Vehicle keys ................................................................. 28
Check regularly and before a long trip ...................... 284
Child seat
See Infant and child restraint systems .................... 83
Climate control ............................................................... 152
Adjustable air outlets,
rear passenger compartment ............................. 172
Air recirculation ........................................................ 158
Basic setting ............................................................... 156
Defrosting ................................................................... 157
Display and controls ................................................. 154
Dust filter ................................................................... 155
Economy mode .......................................................... 159
Front center console
storage compartment ventilation ....................... 171
Residual engine heat utilization ............................. 159
Special settings ......................................................... 156
Windows fogged up on the inside .......................... 157
Windows fogged up on the outside ................ 157, 166
COMAND, radio and telephone .................................. 232
Combination switch ....................................................... 148
Control and operation of
radio transmitters .................................................... 232
Coolant level .................................................................. 322
Coolant temperature gauge .......................................... 137
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