Buick Enclave Owner's Manual page 340

Some vehicles have floor mats with
a button-type retainer.
Removing and Replacing the
Floor Mat
1. Pull up on the rear of the mat
to unlock and remove.
2. Reinstall the floor mat by lining
up the floor mat opening over
the carpet retainer and
snapping into position.
3. Make sure the floor mat is
properly secured. Verify the
floor mat does not interfere
with the pedals.
Vehicle Care 339