Same way the 2000-up Monte Carlo/Impalas, and I am assuming the Grand Prixs as well. I want to say the high-end GMs used the pressure sensor, but I am not certain if they even still use that setup. It makes upgrading rims pretty difficult unless you want to get rid of that function altogether.
Which brings us to this question: Has anyone noticed a change in the way the WSS system operates when rims are upgraded? If there were to be any sort of effect, it would have to happen when the rolling diameter of the rim/tire combo changes (i.e. gets larger, since nobody downgrades sizes). If not, then it means that the ECM could care less what the size of the rims are, so long as ALL rim/tire combos are the same on all corners and 2)they all have the same pressure.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.