Subaru 2003 Legacy - Manual (Page 95)

2
Keys and doors
2-5
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Power door locking switches
HB2009BB HB2008CB
All doors and the rear gate (station wagon) can be locked and unlocked
by the power door locking switches located at the driver’s side and the
front passenger’s side doors.
To lock the doors, push the switch forward.
To unlock the doors, push the switch rearward.
When you close the doors after you set the door locks, the doors remain
locked.
NOTE
Make sure that you do not leave the key inside the vehicle before
locking the doors from the outside using power door locking
switches.