B007EDriver Seat Belt Pretensioner C Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B007E is the driver's third (C) pretensioner circuit. Mercedes-Benz fills this slot with the retractor: in LI54.21-P-070658 for the A-, CLA- and GLB-Class, B007E13 is an open circuit at the squib of the driver's emergency tensioning retractor, with B0079 for the belt end fitting tensioner and B0080 for the driver's belt force limiter. The retractor unit is housed either inside the B-pillar or within the seat and winds the spool back to remove slack from the shoulder belt, as GM and Joyson explain. The same Mercedes list puts the rear retractors on the C codes B00E3, B00E4, B00E6 and B00E7, so there the C stage consistently means the retractor. A stored B007E means the airbag lamp is on and the driver's shoulder belt will not be pretensioned.
- What you may notice
- Airbag warning lamp on
- Driver's shoulder belt is not tightened in a crash
- Safety note: the retractor holds a pyrotechnic charge; disconnect the battery, wait, and leave the work to a specialist workshop
- Likely causes
- LikelyRetractor plug at the lower driver-side B-pillar loose or terminals spread
- PossibleHarness pinched by B-pillar or sill trim
- RareInternal fault of the driver retractor pretensioner
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.