go to this link:
http://www.onstar.com/us_english/jsp/ovd/index.jsp and click on the orange circle thats on the wheel of the car thats there. a thing will pop up on how its going to be shown. it shows individual tire pressures. dont know if its gona be available withthe h3 but i think it will. just because the pressures are not displayed on the DIC does not mean that the BCM does not know what they are. Just like with oil life.