Subaru 2003 Legacy - Manual (Page 102)

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that the transmitter has been programmed.
Any additional transmitters can also be programmed at this time.
Repeat steps 1 through 3 for an additional transmitter.
To exit the programming mode:
1. After all of your transmitters are programmed, remove the key from
the ignition switch.
The horn will sound three times to indicate that the system has exited
the programming mode.
2. Make sure that the keyless entry system properly operates by
operating each transmitter.
n Deleting old transmitter codes
The control unit of the keyless entry system has four memory loca-
tions to store transmitter codes, giving it the ability to operate with up
to four transmitters. When you lose a transmitter, the lost transmitter’s
code remains in the memory. For security reasons, lost transmitter
codes should be deleted from the memory.
To delete old transmitter codes, program four transmitter codes into
the system. If you have only one current transmitter, program it four
times. If you have two current transmitters, program each one twice. If
you have three current transmitters, program two of them once and
the third one twice. This process will leave only current transmitter
codes in the system’s memory.
NOTE
Make sure no one else is operating their keyless entry system
within range of your vehicle when programming transmitters. If
someone else were to operate their remote transmitter while you
are programming your transmitters, it is possible that their trans-
mitter code will be programmed into your system, allowing them
unauthorized access to your vehicle.