B0084
Driver Belt Buckle Switch Circuit
The SRS module has detected a fault in the driver belt buckle switch circuit. The fastened-state of the seat belt cannot be reliably read — affects belt warning and airbag deployment logic.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
Ordered by how often each turns out to be the cause.
- Buckle switch failedCommon
- Wiring under seat openPossible
Parts involved
- Seat Belt Buckle Switch
- Srs Control Module
- Srs Wiring
B0084 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.