Cadillac 1999 Catera Owner's Manual page 17

Return the safety belts to
their original positions so
they will be available for
rear seat passengers to use.
To do so, slide the buckle
into the latch as shown.
The panel behind the rear seat armrest also folds. Turn
the knob counterclockwise and pull the panel forward to
gain access to the trunk. When finished using the panel,
return it to its original position and turn the knob
clockwise to secure.
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