Cadillac 2007 - Manual (Page 478)

When your vehicle has a flat tire, use the following
example as a guide to assist you in the placement
of wheel blocks.
The following information will tell you next how to
use the jack and change a tire.
Removing the Spare Tire and Tools
The jack and the wheel blocks are located
under a cover near the passenger side rear seat.
To remove the jack and wheel blocks, do the
following:
1. Remove the jack cover by turning the two
wing nuts one-quarter turn counterclockwise
and pulling the jack cover off.
Rear Seat (Passenger Side) Jack Cover
478