Chevrolet 2007 Equinox 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.