Body, generic

B0078 Third Row Right Seat Belt Pretensioner Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0078 refers to the right seat of the third row and its belt pretensioner. No carmaker publishes B0078 in this J2012 sense, and Mercedes models with third-row tensioning retractors log the right-hand unit as B00E6 instead. Like B0077, the number has a sensor meaning in GM's older Saab modules: the 2006 Saab 9-5 sets B0078 for an open or short in the communication with the passenger-side side-impact sensor, and the 9-3 airbag module (2003, 2007) uses it for the passenger-side B-pillar sensor, with bytes for faulty communication, a short to battery or ground, or a wrong sensor fitted. Where the code really concerns the right pretensioner of the third row, the airbag lamp is on and that seat loses its pretensioning until the loop is repaired.

Likely causes

On older Saab 9-3/9-5, fault at the passenger-side side-impact or B-pillar sensor (older GM meaning)
Plug at the third-row right belt loosened when the seat was folded or removed
Internal fault of the third-row right pretensioner

Symptoms

  • Airbag warning lamp on
  • Third-row right occupant without pretensioning, or on Saab impaired side-impact detection on the passenger side
  • Safety note: pyrotechnic restraint parts; only work on them with the battery disconnected, after the wait time, 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 right pretensionersquib circuitsrs control module

Related codes

B0076B0077B00E6

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