Body, generic

B0086 Third Row Left Seat Belt Load Limiter Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0086 is reserved for a switchable force limiter at the left third-row seat. No manufacturer documents it, and an electrically fired limiter that far back is unusual. Delphi's rear-seat patent explains why: without airbags or weight sensing in rear rows, it picks the level from the length of webbing drawn out, about 4–6 kN for a large occupant or a child seat and 2–3 kN for a small occupant. NHTSA's 2013 study likewise counts load limiters as standard only at the front outer seats. On GM Global A cars (2011 Saab 9-4X) B0086 stands for the right front side impact sensor, watched for shorts and opens, too little current, internal errors, an incorrect part and corrupt messages, each needing ten seconds to set. Where a third-row limiter loop does exist, a fault lights the airbag lamp.

Likely causes

On GM vehicles, right front side impact sensor or wiring faulty (different meaning)
Third-row harness stressed by folding or removing the seat
Internal fault of the third-row limiter squib

Symptoms

  • Airbag warning lamp on
  • Left third-row belt limits force only at a fixed level
  • Safety note: restraint system with pyrotechnic parts; work only de-energised at a specialist workshop

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–800
Time0.5–3 h

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

Parts involved

third row left load limitersquib circuitsrs control module

Related codes

B0076B0087B0088

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