Subaru 2001 Legacy Owner's Manual page 117

Keys and doors
B Disarming the system
To disarm the system, briefly press the "UNLOCK/DISARM" button on
the transmitter.
B Tripped sensor identification
If the horn sounds four times and the parking lights flash four times
when you disarm the system, this indicates that the alarm was trig-
gered. The number of times the indicator light flashes indicates what
sensor caused the alarm condition.
To enter identification mode:
1. Open the driver's door and leave it open.
2. Turn the ignition switch to the "ON" position two times. ("LOCK"
"ON" "LOCK" "ON" "LOCK")
3. The indicator light will start flashing.
The indicator light provides the following indications.
Flashing one time: Any door, the rear gate or the trunk lid has been
opened.
Flashing three times: The impact sensor in the system's unit has
been activated. This may indicate that your vehicle has been shocked
or tampered with by some outside force and/or unauthorized person.
Flashing four times: The ignition switch has been turned on.
To exit this mode, close the door and turn the ignition switch to the
"ON" position.
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