WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Courtesy Lamps Control & I/P Schematic (Early Production)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Courtesy Lamps Control & I/P Schematic (Late Production)