WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: P0412: Secondary Air Injection Solenoid Relay Control Circuit (Steps 1-5)
Courtesy of GENERAL MOTORS CORP.
Fig 2: P0412: Secondary Air Injection Solenoid Relay Control Circuit (Steps 6-17)