Airbags

B0003 — Driver Frontal Airbag Stage 3 Deployment Control Circuit Fault

Severity: high Drive with care, to a shop

What B0003 means

The SRS control module continuously tests the circuits that fire the driver's airbag. B0003 means it found a problem in the stage 3 circuit, the additional stage used to vary inflation. The cause may be an open or shorted circuit, abnormal resistance, or an internal module or configuration error. The system usually disables part or all of the airbag protection and turns on the warning light.

Symptoms

  • AIRBAG/SRS warning light stays on
  • Airbag readiness indicator does not show ready
  • No change in engine or driving performance
  • Other SRS circuit codes may be stored too

Possible causes

  1. Damaged wiring or poor connection in the driver airbag deployment circuit
  2. Loose or corroded connectors under the seat or at the steering column
  3. Faulty clock spring in the steering wheel
  4. Defective driver airbag module (inflator)
  5. Internal fault or configuration error in the SRS module
  6. Faulty impact sensors affecting the deployment signal

How to diagnose

  1. Scan all modules with an SRS-capable tool and save the freeze-frame data
  2. Look for other SRS codes, which may point to a shared cause
  3. Inspect SRS connectors under the seat and at the steering column for corrosion, poor latching or bent pins
  4. Ask about recent work: steering wheel removal, seat service or collision repair
  5. Disconnect the battery and wait as the manufacturer specifies before testing the circuit per the wiring diagram; never probe airbag circuits with an ordinary meter
  6. Check the clock spring and its connector
  7. Verify SRS module configuration and software version
  8. Clear the code after repair and confirm it does not return

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the clock spring if faulty
  • Replace the driver airbag module
  • Reflash or reconfigure the SRS module
  • Replace the SRS module if it has an internal fault

Questions and answers

Is it safe to drive with B0003?

The car will drive as usual, but the driver's airbag may not deploy properly in a crash. Don't put off diagnosis.

Can I just clear B0003 myself?

A scan tool can erase it, but it will return if the fault remains. Airbag work is hazardous, so a qualified technician should handle it.

What is a stage 3 airbag deployment?

A multi-stage airbag can inflate with different force depending on crash severity. Stage 3 is one of those stages, and this code points to a problem in its circuit.

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.