B00E4Second Row Right Seat Belt Pretensioner C Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B00E4 belongs to the outboard seat on the right in the back and its C-stage tensioner. Mercedes-Benz uses it in that sense: every version of LI54.21-P-070658 seen here (December 2019 to June 2020) lists B00E413 as an open in the squib of the tensioning retractor at the rear right. The topic blames higher resistance at the SRS unit connector rather than the tensioner and tells technicians to trace the wire, reseat the plugs and replace the unit only on recurrence. The retractor sits behind the rear trim or in the seat and winds the webbing back when fired, as GM's rescue guide and Joyson explain. No public bulletin from another maker cites B00E4. While the code is stored, the airbag lamp or SRS message stays on.
- What you may notice
- SRS message or airbag lamp permanently displayed
- Right rear passenger loses shoulder-belt tensioning
- Safety note: pyrotechnic tensioner – only work on it with the battery disconnected and after the wait time, ideally at a specialist workshop
- Likely causes
- LikelyPoor contact at the SRS control unit plug (Mercedes A-Class/CLA/GLB)
- PossiblePlug at the right rear retractor loose after trim removal
- RareAirbag control unit itself faulty (fault returns after reconnecting)
- RareSquib in the right rear retractor open
- 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.