Body, generic

B00E1 Third Row Right Seat Belt Pretensioner B Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

On the right seat of the third row, B00E1 stands for a B-stage tensioner whose firing loop shows an open, a short or an out-of-window resistance. In no public service document does a manufacturer use B00E1. Where Mercedes-Benz fits a right third-row tensioner, it is the retractor, and the airbag unit reports it as B00E6 (LI54.21-P-070658, versions of March and June 2020). A B stage there would be a buckle or anchor device; NHTSA's 2013 study of pretensioners explains how a buckle unit drags the buckle down by a cable when its charge fires, and GM lists buckle, retractor and anchor units as the three possible types. Expect a lit airbag lamp and no tensioning from this stage until the loop is repaired.

Likely causes

Connector of the right third-row buckle or anchor tensioner not fully seated
Wiring under the cargo floor or side trim pinched or damaged by loads
Raised contact resistance at the airbag module plug
Defective squib inside the tensioner

Symptoms

  • Airbag lamp on in the instrument cluster
  • Occupant at the right of the third row gets no B-stage tensioning
  • Safety note: the tensioner contains a pyrotechnic charge; only work on it de-energised (battery off, wait time) and leave it to a specialist workshop

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–600
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

third row right pretensioner bsquib circuitsrs control module

Related codes

B00E0B00E2B00E6B0078

References: crashstats.nhtsa.dot.gov, static.nhtsa.gov, gmstc.com, mbusa.com.