Subaru 2003 Legacy Owner's Manual page 105

Keys and doors
n To arm the system using power door locking switches
2
HB2024CC
1. Close all windows and moonroofs (if so equipped).
2. Remove the key from the ignition switch.
3. Open the doors and get out of the vehicle.
4. Make sure that the engine hood (and the trunk lid) is locked.
5. Close the doors (and the rear gate on the station wagon) but leave
only the driver's door or the front passenger's door open.
6. Push the power door locking switch forward ("LOCK" side) to set
the door locks.
7. Close the door. An electronic chirp will sound one time, the turn
signal lights will flash one time and the indicator light will start flashing
slowly (approximately once every two seconds) to inform you that the
system has armed.
NOTE
The system can be armed even if the engine hood, the windows
and/or moonroofs are opened. Always make sure that they are
fully closed before arming the system.
B Disarming the system
Briefly press the "UNLOCK/DISARM" button (for less than two
seconds) on the remote transmitter. The driver's door will unlock, an
electronic chirp will sound two times, the turn signal lights will flash
two times and the indicator light will go off.
To unlock all other doors (and the rear gate on the station wagon),
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