Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB1991900 BASE, 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSDIS IGNITION CONTROL UNIT9000 SERIES POWER CIRCUIT
1991 Saab 900 Base, 2D Convertible, Automatic
9000 Series Power Circuit
1991 Saab 900 Base, 2D Convertible, AutomaticSECTION 9000 Series Power Circuit
- Check for battery voltage between ECU terminal No. 22 (Red wire) and ground. If battery voltage is not present, check fuse No. 23 on power distribution panel behind glove box. If fuse is okay, repair Red wire to fuse No. 23, or Red wire from fuse panel to main distribution terminal on battery bracket.
- Turn ignition on. Check for battery voltage between ECU terminal No. 35 (Green/Red wire) and ground. If battery voltage is not present, check for open Green/Red wire from ECU terminal No. 35 to main relay terminal No. 3. If wire is okay, check main relay. See MAIN RELAY .
- Turn ignition on. Check for battery voltage between ECU terminal No. 21 (Green/White wire) and ground. If battery voltage is not present, check fuse No. 9 on fuse panel in engine compartment. If fuse is okay, check for open Green/White wire from ECU to fuse panel, open Green/White wire from ignition switch to fuse panel, or defective ignition switch.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.