Airbags

B003B — Second Row Right Frontal Airbag Stage 3 Deployment Control Fault

Severity: high Drive with care, to a shop

What B003B means

The SRS control module detected a fault in the circuit that controls deployment of the second row right frontal airbag, stage 3. The module constantly tests the airbag igniter (squib) circuit for resistance and continuity, and sends a firing signal in a crash. When a fault is found, it may disable that airbag, so it would not deploy.

Symptoms

  • Airbag/SRS warning light on or flashing
  • B003B stored in the SRS module
  • Right second row airbag possibly disabled
  • Sometimes other SRS circuit codes alongside

Possible causes

  1. Damaged or chafed wiring in the right second row airbag circuit
  2. Poor connection or corroded connector at the airbag or SRS module
  3. Faulty SRS control module (SDM)
  4. Defective airbag, igniter or related sensor
  5. Wiring disturbed by earlier seat or trim work

How to diagnose

  1. Scan all SRS codes with a tool that supports airbags and note the freeze frame data
  2. Ask about recent seat or trim work and look for liquid spills on the floor
  3. Disconnect the battery and wait as the manufacturer specifies, then inspect second row SRS harnesses and connectors
  4. Check connectors for corrosion, bent pins and loose locks, especially the yellow SRS connectors
  5. Test circuit continuity and resistance per the wiring diagram; never apply power to a squib with a meter
  6. Clear the code and see whether it returns
  7. If the circuit is good, suspect the airbag or the SRS module

Common fixes

  • Repair or replace damaged wiring and connectors in the airbag circuit
  • Clean contacts or replace a corroded connector
  • Replace the right second row frontal airbag or related sensor
  • Replace or reprogram the SRS control module (SDM)

Questions and answers

What does B003B mean?

The SRS module found a fault in the deployment control circuit of the second row right frontal airbag, stage 3. The airbag may not deploy in a crash.

Can I fix airbag problems myself?

Reading codes and checking connectors is fine, but handling airbags and squibs carries a risk of accidental deployment. Component replacement is best left to a professional shop.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.