Cadillac 2010 CTS Sport Sedan Owner's Manual page 305

To open the hood:
1. Pull the hood release lever with
this symbol on it. It is located
inside the vehicle on the lower
left side of the instrument panel.
2. Then go to the front of the
vehicle and find the secondary
hood release lever. The lever is
located under the front edge of
the grille near the center. Push
the release lever up and raise
the hood.
Before closing the hood, be sure
all the filler caps are on properly.
Then pull the hood down and
close it firmly.