ECM Harness Resistance
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to LOCK position. Disconnect ECM and appropriate component harness connectors. Check for open or short circuits between appropriate ECM harness connector terminal and appropriate component harness connector terminal. See WIRING DIAGRAMS . If harness is open or shorted, repair as necessary.