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 MANUALSSAAB1990900 BASE, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)RESTRAINTSAIR BAG, SRSAIR BAG RESTRAINT SYSTEMSELF-DIAGNOSTICSTEST NO. 11 (9000 SERIES)FAULT CODE 1F
1990 Saab 900 Base, 2D Convertible, Standard
Fault Code 1F
1990 Saab 900 Base, 2D Convertible, StandardSECTION Fault Code 1F
- Disconnect seat belt tensioner connector. Connect Resistor (8471153) to connector. Disconnect 12-pin ECU connector.
- Turn engine on. Turn on electrical loads, one at a time. Measure resistance between 12-pin ECU connector terminal No. 9 (Blue wire) and voltage, and between terminal No. 5 (Brown wire) and voltage.
- If either resistance measurement is 470 ohms or less, fault is located in wiring between 12-pin ECU connector and seat belt tensioner. If both resistance measurements are more than 470 ohms, fault is located in wiring between 12-pin ECU connector and ECU. Replace ECU as necessary.
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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.