Airbag Warning Light On
The airbag warning light is constantly illuminated on a 2019 BMW 3 Series, indicating a fault in the supplemental restraint system (SRS). This system includes airbags, seatbelt pretensioners, and sensors. The light staying on means the system may not deploy in a crash, posing a serious safety risk.
Diagnosis Details
Possible Causes
Faulty occupant detection sensor in the passenger seat (often due to a damaged mat or wiring under the seat).
Loose or corroded electrical connector under the front seats (common when seats are moved or items get kicked).
Failed clock spring in the steering wheel (affects driver airbag and horn).
Faulty seatbelt buckle switch or pretensioner.
SRS control module malfunction or software glitch.
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What You Should Do
Do not ignore the airbag light.
Have the vehicle diagnosed by a professional using a BMW-compatible scan tool to read SRS fault codes.
Common steps: check and clean connectors under the front seats, inspect the passenger seat occupancy sensor mat, and test the clock spring.
Do not attempt to repair airbag components yourself as they can deploy unexpectedly.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.