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.
DTC B1780: Front Occupant Classification Sensor LH Circuit Malfunction [12/2019 - 11/2023]: Description
The front occupant classification sensor LH circuit consists of the occupant detection ECU and front occupant classification sensor LH.
DTC B1780 is stored when a malfunction is detected in the front occupant classification sensor LH circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1780 | Front Occupant Classification Sensor LH Circuit Malfunction |
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- *: The front occupant classification sensor LH is built into the separate type front seat cushion spring assembly RH.
NO RELATED
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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.