Body, generic

B0071 First Row Center Seat Belt Pretensioner Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0071 is reserved for a pretensioner at the middle seat of the first row, which exists only where a three-person front bench is fitted. The airbag module would watch this squib like any other firing loop and flag an open, a short or a resistance outside its window. No carmaker publishes B0071 with this meaning. Mercedes-Benz does show that such a device can be present: its information LI54.21-P-070658 (A-, CLA-, GLB-Class) lists an open circuit at the emergency tensioning retractor in the centre of the first seat row, but files it under its own code B1B36. GM places buckle pretensioners at the inner flank of a front seat. In the airbag modules of the Saab 9-3 (2003, 2007), B0071 stands for a short in the passenger curtain or rollover-bar circuit, a different part altogether.

Likely causes

Plug under the front bench centre seat loose or corroded
Harness damaged when the centre seat or console is folded or removed
Airbag module configured for a centre pretensioner the vehicle does not have
Internal fault of the centre pretensioner

Symptoms

  • Airbag warning lamp on
  • Middle front occupant gets no belt pretensioning in a crash
  • Safety note: pyrotechnic component; disconnect the battery, wait the specified time and leave the work to a specialist workshop

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–700
Time0.5–3 h

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

Parts involved

first row center pretensionersquib circuitsrs control module

Related codes

B0070B0072B0074

References: static.nhtsa.gov, gmstc.com, saabwisonline.com, saabwisonline.com.