Subaru 2004 Legacy Owner's Manual page 120

To program the transmitters:
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1. Open the driver's door.
2. Close the driver's door.
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1) Press any button.
3. Press and release any button on the transmitter
that you wish to program into the system. The horn will
sound two times to indicate 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, re-
move the key from the ignition switch.
The horn will sound three times to indicate that the
Keys and doors
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