B0078Third Row Right Seat Belt Pretensioner Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B0078 refers to the right seat of the third row and its belt pretensioner. No carmaker publishes B0078 in this J2012 sense, and Mercedes models with third-row tensioning retractors log the right-hand unit as B00E6 instead. Like B0077, the number has a sensor meaning in GM's older Saab modules: the 2006 Saab 9-5 sets B0078 for an open or short in the communication with the passenger-side side-impact sensor, and the 9-3 airbag module (2003, 2007) uses it for the passenger-side B-pillar sensor, with bytes for faulty communication, a short to battery or ground, or a wrong sensor fitted. Where the code really concerns the right pretensioner of the third row, the airbag lamp is on and that seat loses its pretensioning until the loop is repaired.
- What you may notice
- Airbag warning lamp on
- Third-row right occupant without pretensioning, or on Saab impaired side-impact detection on the passenger side
- Safety note: pyrotechnic restraint parts; only work on them with the battery disconnected, after the wait time, at a specialist workshop
- Likely causes
- LikelyOn older Saab 9-3/9-5, fault at the passenger-side side-impact or B-pillar sensor (older GM meaning)
- PossiblePlug at the third-row right belt loosened when the seat was folded or removed
- RareInternal fault of the third-row right pretensioner
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.