Circuit/System Verification
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, engine running, observe the scan tool ECM GEN-F Terminal Signal parameter. The GEN-F Terminal Signal parameter should read between 5-95 percent.