Body, generic

B0030 Second Row Left Side Airbag Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

In J2012 the B003x block covers the second seat row, and B0030 is the left rear side airbag, mounted in the rear door or the outer backrest. Mitsubishi files B0030 under the rear side airbag module LH and sets a short to another circuit after 2 seconds. Mercedes-Benz reads B003013 as an open squib in the left rear sidebag on the A-Class, CLA and GLB, often caused by higher contact resistance at the restraint unit connector (LI54.21-P-070658). The older GM numbering differs: on the 2006 Saab 9-5, B0030 is a passenger side airbag loop whose pin voltage is above 4.1 or below 1.0 volts for 2 seconds, and the Saab 9-3 reads it as a passenger side bag short. The right-hand rear twin is B0038. Airbag lamp on.

Likely causes

Raised contact resistance at the restraint module or rear side airbag connector
Damaged lead in the rear door transition or rear seat backrest
Internal fault in the rear left side airbag module

Symptoms

  • Airbag warning lamp on
  • Rear left side airbag may not deploy in a side impact
  • Safety note: do not probe the airbag circuit yourself; unplug airbag connectors only with the battery disconnected and the stated wait time observed

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

second row left side airbagsrs control modulesrs wiring

Related codes

B0038B0020B0040

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