Body, generic

B002A Right Curtain Deployment Control 2

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B002A is the second firing loop of the right curtain airbag, needed only where the right side has two curtain inflators or a separate curtain section for the rear seats. Mercedes-Benz uses it that way on the A-Class, CLA and GLB: B002A13 marks an open squib in the right rear window bag, while the front part reports B0029; a known trigger was poor contact at the control unit plug (LI54.21-P-070658). A TRW and Ford patent describes front-row and rear-row curtains that inflate separately and may be tethered together at the B-pillar. Where curtains also deploy in a rollover, FMVSS 226 requires a readiness indicator the driver can see. Airbag lamp on; head protection for the right rear seat may be missing.

Likely causes

Raised contact resistance at the restraint module connector (Mercedes LI54.21-P-070658)
Damaged lead to the rear curtain section at the C-pillar or roof rail
Internal fault in the rear right curtain airbag module

Symptoms

  • Airbag warning lamp on
  • Head protection for the right rear seat may be missing
  • 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€100–1,000
Time1–4 h

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

Parts involved

right curtain airbagsquib circuitsrs roof wiring

Related codes

B0029B0022B0038

References: static.nhtsa.gov, patents.google.com, law.cornell.edu.