WARNING: This page is about a different car, the 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: 5.3L VIN P, A/T Circuit
Fig 2: 5.3L VIN P, Transfer Case Circuit, 2 Speed
Fig 3: 5.3L VIN P, Transfer Case Circuit, Single Speed