WARNING: This page is about a different car, the 2000 GMC Yukon, 2000 Chevrolet Tahoe, 2000 Chevrolet Pickup, and 2000 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Body Control Module (BCM) Wiring Diagram (Escalade, Tahoe & Yukon Denali)