B00E7Third Row Left Seat Belt Pretensioner C Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B00E7 marks the C-stage tensioner of the third row's left seat, listed after its right-hand twin B00E6. Mercedes-Benz documents it: LI54.21-P-070658 uses B00E713 when the firing pill of the left third-row tensioning retractor shows an open, in the same list as the rear and driver retractors. In that topic the remedy does not start with the tensioner but with fault-tracing the wire and reconnecting the restraint unit plugs; only a recurring fault calls for a new control unit of at least level Q4. Joyson describes this kind of pyrotechnic retractor, which can sit in the body or the seat structure. No other maker publishes B00E7. Airbag lamp on; the left third-row occupant is not tensioned.
- What you may notice
- Airbag lamp or fixed SRS message
- No pretensioning for the left third-row seat
- Safety note: pyrotechnic device – disconnect the battery and wait before touching it; have it serviced at a specialist workshop
- Likely causes
- LikelyRaised resistance at the restraint unit plug
- PossibleLeft third-row retractor connector disturbed during trim or seat work
- RareControl unit below the required level, fault keeps returning
- RareRetractor squib open internally
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.