Mercedes-Benz E-class 1998 Starting and Turning Off the Engine - Manual (Page 17)

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Infrared receiver in passenger door
handle
Locking and Unlocking
Unlocking:
Press transmit button . All turn
signal lamps blink once to indicate that
the vehicle is unlocked.
The remote control can be pro-
grammed for two kinds of unlocking
methods (see below):
Selective unlocking mode -
Press transmit button once to
unlock driver's door and fuel filler flap.
Press transmit button twice to
unlock doors, fuel filler flap, and trunk.
Global unlocking mode -Press
transmit button
once to unlock
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 or
tailgate 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.
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 transmitter
(if ok, battery check lamp in
transmitter will light briefly when
transmitting) or to synchronize the
system, see
Remote Control in Index.
Choosing Global or Selective Mode
on Remote Control
Press and hold transmit buttons
and simultaneously for five
seconds to reprogram the remote
control. Battery check lamp will blink
two times indicating the completed
mode change.