Cadillac 2013 Caddilac CTS Owner's Manual page 307

To open the hood:
1. Pull the hood release lever with
this symbol on it. It is inside the
vehicle on the lower side of the
instrument panel.
2. Go to the front of the vehicle and
find the secondary hood release
lever. The lever is under the
front edge of the grille near the
center. Lift 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.