Mitsubishi LANCER Owner's Manual page 159

Features and controls
3. Lock all doors by either the remote control transmitter or
the F.A.S.T.-key.
Arm the system and leave
3
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At this time, the theft-alarm indicator (A) on the audio
panel flashes for confirmation.
4. The system has entered the armed stage after about 20
seconds, when the theft-alarm indicator (A) flashing
becomes slower.
The theft-alarm indicator (A) continues to flash while the
system is in the armed stage.