B0090 - Body Fault Code B0090 - 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 B0090 indicates a circuit fault or communication timeout with the Left Front Restraints/Impact Sensor. Modern SRS units interface with front satellite acceleration sensors via a two-wire current-loop bus (typically PSI5 or DSI protocol). The ACM/SDM supplies a DC bias voltage and decodes digital telemetry via current modulation. The code triggers upon detecting an open circuit, short to ground, short to battery, or invalid/missing Manchester-coded data frames from the left front sensor.
Possible Causes
1. Korrosion eller fuktinträngning i främre sensorkontaktstycket (utsatt läge bakom stötfångare/kylarbalk)
2. Skadat eller avskavt kablage i motorutrymmets främre kabelstam (efter tidigare krockskada eller gnagare)
3. Defekt främre krocksensor (internt piezoelektriskt/MEMS-fel eller spräckt plasthölje)
4. Internt hårdvarufel i SRS-styrdonet (drivsteg eller signalavkodare)
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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