WARNING: This page is about a different car, the 1997 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Scan Tool Does Not Communicate W/Components - Steps 1-4 (1 Of 2)
Courtesy of GENERAL MOTORS
Fig 2: Scan Tool Does Not Communicate W/Components - Steps 5-14 (2 Of 2)