Mercedes-Benz 1998 SL 500 Operator's Manual page 29

The vehicle is automatically locked
again, if within 40 seconds of
unlocking with the remote control,
neither door or trunk is opened, the key
is not inserted in the steering lock, or
the central locking switch is not
activated.
Locking:
Press transmit button
turn signal lamps blink three times to
indicate that the vehicle is locked.
Notes:
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.
For operation in the USA only: This
devise 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
once. All interference that may cause
undesired operation.
Any unauthorized modification to this
device could void the user's authority
to operate the equipment.
Choosing Global or Selective Mode on
Remote Control
Press and hold transmit buttons
simultaneously for five seconds to
reprogram the remote control. Battery
check lamp will blink two times
indicating the completed mode change.
Opening the Trunk
Press transmit button until trunk lid is
released.
Important!
Do not place remote control in trunk
since trunk is locked again when closing
the lid.
Note:
If the trunk was previously locked
separately, it will remain locked
(see Index).
and
29