B0099
Occupant Detection Module Internal Fault
The occupant detection module reports an internal fault detected by self-test. The module typically processes seat sensor data and reports occupancy status to the SRS module.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
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.
- Occupant detection module internal faultCommon
- Power supply or ground fault to modulePossible
Parts involved
- Occupant Detection Module
- Srs Control Module
B0099 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.