Cadillac 2005 CTS Owner's Manual page 13

Use the following steps to lower one or both of the rear
seatbacks:
1. Insert a tool with a
small tip into the slot
as shown to unlatch
the seatbelt buckle.
Then move the belt to
the side so it is not
in your way.
2. There is a tab located
on the outboard sides
of the seatback.
Pull forward on the
tab to unlock the
seatback.
3. Fold the seatback down. This will allow you direct
access to the trunk.
4. Repeat Steps 2 and 3 to fold down the other
seatback.
{
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
press rearward on the seatback to be sure it is
locked.
{
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.
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