B00C9Passenger Seat Occupant Position Sensor C
- Generic OBD-II code · Body
- How the car detects it
- B00C9 names position sensor C of the passenger seat, and no carmaker lists it publicly. One concept for a third input watches the gap between torso and seat back: a patent first filed by Automotive Systems Laboratory in 1998, now with Joyson, pairs an electric field sensor in the cushion with a capacitive or radar proximity sensor in the back, aimed at the band about 10 to 18 inches above the cushion. While the torso rests within about 2 inches of the back the bag may fire; if it has been away by more than that for over 50 ms, the bag is disabled. If the back sensor keeps seeing someone the cushion sensor misses, the patent treats that as a fault. FMVSS 208 leaves the choice of such sensors to the maker. B00C9 lights the airbag lamp.
- What you may notice
- Airbag warning lamp on
- Airbag status lamp may change while the passenger leans forward
- Safety note: airbag system; seat back and sensor only de-energised (ignition off, battery off, wait time), no third-party seat covers over sensors, specialist workshop only
- Likely causes
- LikelyLead to the seat back sensor broken at the hinge or after trim work
- PossibleProximity sensor C faulty or its signal disagrees with the cushion sensor
- RareThick accessory covers or a wet seat back weakening the field signal
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.