Subaru 2004 Legacy - Manual (Page 121)

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Keys and doors
system has exited the programming mode.
2. Make sure that the keyless entry system properly
operates by operating each transmitter.
T Deleting old transmitter codes
The control unit of the keyless entry system has four
memory locations 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 re-
mains in the memory. For security reasons, lost trans-
mitter codes should be deleted from the memory.
To delete old transmitter codes, program four trans-
mitter codes into the system. If you have only one cur-
rent 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 memo-
ry.
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 transmitter code will be programmed into
your system, allowing them unauthorized access
to your vehicle.