Cadillac 2007 CTS Owner's Manual page 102

Rear-Seat Pass Through
If your vehicle has the rear seat-pass through
door, you can access the trunk without opening the
trunk lid. This is especially useful when
transporting long items.
To open the door, pull down the rear seat armrest.
Then pull the lever all the way down to release
the door.
To close the door, push it up and back into place.
Then try to open the door without pulling up on
the lever to make sure it is locked into place.
102
Emergency Trunk Release Handle
Notice: Do not use the emergency trunk
release handle as a tie-down or anchor point
when securing items in the trunk as it
could damage the handle. The emergency
trunk release handle is only intended to aid a
person trapped in a latched trunk, enabling
them to open the trunk from the inside.
There is a glow-in-the-dark emergency trunk
release handle located on the back wall of the
trunk. This handle will glow following exposure to
light. Pull the release handle toward the front
of the vehicle to open the trunk from the inside.