B0091 - Body Fault Code B0091 - SRS / Krockkuddar (Airbag Förar/Passagerar/Sido/Gardin)
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System
Body (Interior, Lighting, Comfort)
Related Fault Codes
Body Fault Code B0001 - SRS / Krockkuddar (Airbag Förar/Passagerar/Sido/Gardin)
Body Fault Code B0002 - SRS / Krockkuddar (Airbag Förar/Passagerar/Sido/Gardin)
Body Fault Code B0003 - SRS / Krockkuddar (Airbag Förar/Passagerar/Sido/Gardin)
Body Fault Code B0004 - SRS / Krockkuddar (Airbag Förar/Passagerar/Sido/Gardin)
Technical Description
DTC B0091 designates a circuit or telemetry fault on the Left Side Restraints Sensor 1 (front left side-impact satellite sensor). The sensor utilizes a current-loop protocol (e.g., PSI5 Manchester-encoded data modulated between low and high current levels). The Airbag Control Module (ACM) monitors supply voltage, quiescent loop current (~4-11 mA), and dynamic telemetry frames. The code triggers upon loop open-circuit, short to ground/battery, or persistent digital frame/checksum mismatch.
Possible Causes
1. Kabelbrott, klämda ledningar eller skavning i dörrgenomföring / gummibälg mellan A/B-stolpe och dörr.
2. Korrosion eller stiftdeformation i kontaktstycke (särskilt vid golvgenomföring eller B-stolpe).
3. Defekt sidoslagssensor (intern piezo-/MEMS-accelerometer eller ASIC-fel).
4. Felaktig programmering/kalibrering eller internt fel i Airbag-styrenheten (ACM).
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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