900 Series Power Circuit
WARNING: This page is about a different car, the 1991 Saab 9000 and 1991 Saab 900. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Check for battery voltage between ECU terminal No. 6 (Green/White wire) and ground. If battery voltage is not present, check fuse No. 3. Fuse panel is located in left side of engine compartment. If fuse is okay, check for open Green/White wire between fuse panel and ECU terminal No. 6, or for a defective ignition switch.