Body, generic

B0077 Third Row Center Seat Belt Pretensioner Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0077 stands for the pretensioner at the middle seat of the third row. Hardly any vehicle fits one, and no manufacturer documents B0077 with this J2012 meaning; Mercedes, which equips some models with third-row tensioning retractors, lists only a left and a right unit (B00E7/B00E6). The number is met more often in older GM-built Saabs. The 2006 Saab 9-5 stores B0077 when the airbag module cannot communicate with the driver-side side-impact sensor because of an open or a short, and Saab 9-3 modules of 2003 and 2007 use it for the driver-side B-pillar sensor. On such cars the fault lies in the door or pillar sensor, not in a rear belt. For a genuine third-row centre pretensioner, a stored code means a lit airbag lamp and a disabled unit.

Likely causes

On older Saab 9-3/9-5, fault at the driver-side side-impact or B-pillar sensor (older GM meaning)
Plug of the third-row centre pretensioner disturbed during seat folding or removal
Airbag module coded for a centre pretensioner that is not installed

Symptoms

  • Airbag warning lamp on
  • On Saab, side airbag deployment on the driver side may be impaired
  • Safety note: airbag sensors and pretensioners belong to the pyrotechnic restraint system; work only de-energised and at 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 center pretensionersquib circuitsrs control module

Related codes

B0076B0078B00E8

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