B1891: Air Bag Tone Warning Indicator Circuit Short to Battery
CriticalBodyRestraint System
What does B1891 mean?
B1891 is a diagnostic trouble code indicating "Air Bag Tone Warning Indicator Circuit Short to Battery". The ECU is detecting a voltage reading that is below the expected range in the restraint system circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.
Common causes
- Damaged or corroded wiring harness
- Loose or disconnected electrical connector
- Failed restraint system sensor or actuator
- Blown fuse in the related circuit
- Poor ground connection
What should you do?
This is a critical issue. Stop driving as soon as it is safe to do so and have the vehicle inspected immediately. Continuing to drive could cause further damage or pose a safety risk.
Get a diagnosis for YOUR car
Code B1891 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.