Body, generic

B007D Second Row Center Seat Belt Pretensioner B Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B007D names a second pretensioner at the middle seat of the second row. No carmaker documents it, and since even one pretensioner at the rear centre seat is uncommon, a second stage there is rarer still. Where such hardware is fitted, the B stage would act on the buckle or anchor side, comparable to the Autoliv pulley-and-cable buckle tensioner of patent US7360795B2 or the buckle units GM shows at the inner flank of front seats. Wiring to a rear centre position runs through the seat base or floor and can be disturbed when a split bench is folded or taken out. The firing loop is monitored like every other squib circuit. A stored B007D lights the airbag lamp, and the module treats that stage as unavailable.

Likely causes

Plug at the rear centre buckle or anchor tensioner loosened by folding the bench
Airbag module coded for a rear centre B stage that is not present
Harness under the rear bench chafed or pinched

Symptoms

  • Airbag warning lamp on
  • Rear centre occupant without the second pretensioning stage
  • Safety note: pyrotechnic belt hardware; de-energise the system (battery off, wait time) and have a specialist workshop do the work

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

second row center pretensioner bsquib circuitsrs control module

Related codes

B0074B007BB007CB00E5

References: patents.google.com, gmstc.com, crashstats.nhtsa.dot.gov.