2010 Cadillac CTS Owner's Manual - Page 396

9-96 Vehicle Care Removing the Flat Tire and Installing the Spare Tire 1. Do a safety check before proceeding. See If a Tire Goes Flat on page 9‑81 for more information. 3. Find the jacking location using the diagram above and corresponding V-shaped locating notches located in the plastic molding. 4. Insert the hooked end of the extension handle through the jack and the flat end through the wheel wrench. { WARNING Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack. 2. Loosen the wheel nuts, but do not remove them yet, using the wheel wrench. Turn the handle about 180 degrees, then return the handle back to the starting position. This avoids taking the wrench off the lug nut for each turn.