Subaru 2008 Impreza Owner's Manual page 115

2-25
Keys and doors
NOTE
If the rear gate cannot be unlocked due
to a discharged battery, a malfunction
in the door locking/unlocking system
or other causes, you can unlock it by
manually operating the rear gate lock
release lever.
For the procedure, refer to the "Rear
gate – if the rear gate cannot be
unlocked" section in chapter 9 "In case
of emergency".