B0054Second Row Center Seat Belt Sensor
- Generic OBD-II code · Body
- How the car detects it
- B0054 is reserved for the buckle sensor of the middle seat in the second row. That position often has its buckle in a split bench or under a fold-down armrest, so the lead runs through moving seat parts. The rear warning required by FMVSS 208 S7.5(c) for vehicles made from September 2028 covers every rear designated seat, the middle one included. Ford's patent for rear belt monitoring counts latched belts once the car passes 3 mph with the doors shut and warns only when that count drops, so a passenger who changes seats is not flagged. The sensor itself is usually a Hall switch that detects the steel tongue in the buckle. No carmaker documents B0054 publicly; Mitsubishi's passenger code B0052 shows how such a buckle fault is set.
- What you may notice
- Airbag or rear belt warning lamp on
- Middle rear seat shown wrongly in the belt status display
- Safety note: buckle plugs under the rear bench lie close to pretensioner wiring; only unplug them with the battery disconnected and the wait time observed
- Likely causes
- LikelyLead of the centre buckle strained at the split bench or armrest hinge
- PossibleLoose or corroded connector of the centre buckle
- PossibleFaulty Hall switch in the centre buckle
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.