Body, generic

B0048 Third Row Right Side Airbag Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0048 is the right-hand counterpart of B0040: the deployment loop of a side airbag for the right seat in a third row. Few vehicles have one, because the third row usually relies on a curtain that reaches back to the D-pillar. Patent literature covers the hardware: Joyson's seatback side module is described for any seating row including the third, and GM's application treats each rear row as a separate system with its own generator that may stay idle when another fires. No manufacturer documents B0048, and NHTSA holds no bulletin with it. For a second-row right side bag, Mitsubishi shows the usual logic under B0038, a fault confirmed after 2 seconds. Airbag lamp on.

Likely causes

Poor contact at the third-row right side airbag connector
Lead damaged by folding, sliding or removing the third-row seat
Restraint module configured for equipment the vehicle does not have (wrong part or coding)

Symptoms

  • Airbag warning lamp on
  • Right third-row occupant may lack side airbag protection
  • 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

third row right side airbagsquib circuitsrs wiringsrs control module

Related codes

B0040B0038B0049

References: patents.google.com, patents.google.com, mitsubishitechinfo.com.