If you are referring to the factory tire pressure monitor stem valves found on '04+ GM SUVs--they will not function properly--if at all--on '03 and older, due to the fact that they require the receiver which picks up the signal from the sensors, and (I believe) the tire pressure monitor option programmed in the BCM.
You get a low tire pressure warning on the DIC if low tire pressure is detected in any of the four tires ('05 will tell you which tire, '04 just alerts you to a low-pressure issue).