B0339
Rear Seat Heater Circuit
The body control module has detected a fault in the rear seat heater circuit. The rear heating elements are open or shorted.
- 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.
- Heater element brokenCommon
- Wiring open under seatPossible
Parts involved
- Seat Heater Element
- Rear Seat Wiring
B0339 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.