Pontiac 2007 Torrent Owner's Manual page 108

Liftgate Operation with Loss of Power
The liftgate is equipped with an electric latch. If
the battery is disconnected or has low voltage, the
liftgate will not open.
108
To open the liftgate if
this happens, remove
the interior trim
plug located at the base
of the liftgate from
inside the vehicle.
The liftgate can now be opened and closed
manually. You will need to use this procedure to
open the liftgate until the power is restored.
Use a tool to push the
service release lever
located on the latch until
you hear or feel the
gate release.