Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Command the Key Capture Solenoid ON and OFF with the scan tool while attempting to cycle the igniting from OFF to ON. The ignition knob should rotate when the solenoid is commanded ON and should not rotate when the solenoid is commanded OFF.