I checked mine for the first time last week since buying my TTA last year. It is located on the right rear behind the quarter panel. YOu have to unscrew I think 4 tan plastic screws. When I got to mine, it was hard to lift it out. At first I thought it was flat, had no air in it. Then looking into the well, I found a GM canister that is used to inflate it. Now I worry that the canister is 17 years old and will it work. I also found that the canister was lying loose in there and since owning the car I always had a rattle back there. Havent taken it out yet for the season, so I dont know if that was the rattle. Anyway, I assume GM left it flat is that it wouldnt fit in the well inflated. Maybe a good idea to carry some Slime and a small 12 volt inflater. Just my opinion.