Chevrolet Impala 2007 Impala Owner's Manual page 18

Make sure the front seats are not reclined.
If they are, the rear seatbacks will not
fold down all the way.
18
3. Lower the
seatback(s) by
pulling forward on
the tab located
on the outboard side
of the seatback(s).
To return the seats to the normal position, do the
following:
CAUTION:
{
If the seatback is not locked, it could
move forward in a sudden stop or crash.
That could cause injury to the person
sitting there. Always push and pull on the
seatback to be sure it is locked.
1. Raise the seatback up and make sure it latches.
CAUTION:
{
A safety belt that is improperly routed,
not properly attached, or twisted will not
provide the protection needed in a crash.
The person wearing the belt could be
seriously injured. After raising the rear
seatback, always check to be sure that
the safety belts are properly routed and
attached, and are not twisted.