B0081
Front Passenger Belt Switch Circuit
The SRS or body control module has detected a fault in the front passenger seat belt buckle switch circuit. The switch reports whether the belt is fastened and is used for the belt warning lamp and for restraint 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 failed or stuckCommon
- Wiring under seat damagedPossible
Parts involved
- Belt Buckle Switch
- Srs Control Module
- Body Control Module
B0081 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.