Cadillac 2014 ATS Owner's Manual page 372

Use the floor mat with the
correct side up. Do not turn
it over.
Do not place anything on top of
the driver side floor mat.
Use only a single floor mat on
the driver side.
Do not place one floor mat on
top of another.
The driver side floor mat is held in
place by button-type retainers.
1. Pull up on the rear of the floor
mat to unlock the retainers and
remove.
2. Reinstall by lining up the floor
mat retainer openings over the
carpet retainers and snap into
position.
3. Make sure the floor mat is
properly secured in place.