Body, generic

B00E3 Second Row Left Seat Belt Pretensioner C Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B00E3 is the C-stage tensioner of the left outer rear seat, and two makers document it codegenau. Stellantis case S2408000089 (Jeep Wrangler 2023) has the occupant restraint controller store B00E3-13, named there for the retractor tensioner at the left of row two, after a service visit; the fix was to secure connector D3244A with a push-pull-push check, no parts. Mercedes-Benz topic LI54.21-P-070658 (A-Class, CLA, later GLB) reads B00E313 as an open squib in the tensioning retractor behind the left rear passenger, usually caused by high contact resistance at the airbag unit plug; reconnecting comes first, a new control unit only if the fault returns. So C here means the retractor, as Joyson's pyrotechnic retractor describes. Airbag lamp on.

Likely causes

Retractor pretensioner plug not latched after trim or seat work (Jeep Wrangler 2023, connector D3244A)
High contact resistance at the airbag control unit connector (Mercedes LI54.21-P-070658)
Lead to the left rear retractor chafed at the C-pillar or seat frame
Faulty squib in the retractor pretensioner

Symptoms

  • Airbag warning lamp or SRS message in the cluster
  • Left rear shoulder belt is not retracted in a crash
  • Safety note: the retractor pretensioner is pyrotechnic; work only with the system de-energised (battery off, wait time) and preferably at a specialist workshop

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–700
Time0.3–2.5 h

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

Parts involved

second row left pretensioner csquib circuitsrs control module

Related codes

B00E4B00E5B0073B007BB0053

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, joysonsafety.com.