B001A
Center Frontal Stage 3 Deployment Control.
- Generic
- Body
- Generic code
- High severity
How this code is built
- B
- SystemBody
- 0
- Defined bySAE, the same on every car
- 0
- AreaBody area 0
- 1A
- FaultThe specific fault in that area
What it means
B001A is the generic SAE J2012 code for the Center Frontal Stage 3 Deployment Control circuit. The airbag control unit checks the deployment circuit for this centre front restraint stage during its self-test and found a fault, such as an abnormal resistance, an open circuit or a short. The SRS warning light will normally be on, and the restraint may not deploy as intended in a crash. Whether a centre frontal airbag with a third stage is fitted, and where, depends on the model.
Symptoms
- SRS or airbag warning light on the dashboard
- Airbag warning light stays on after start-up and does not go out
- Airbag fault message shown on some models
- Code stored in the airbag control unit, sometimes with other restraint codes
- Passenger airbag status or seat occupancy indicator may behave oddly on some models
Possible causes
- Damaged, loose or corroded connector in the centre frontal airbag circuit, including the connector under the seat or in the dashlikely
- Open circuit, chafed or shorted wiring in the deployment circuit to the stage 3 initiatorlikely
- Faulty clockspring, centre airbag module or its initiator (stage 3 squib) with out-of-range resistancepossible
- Poor connection at the airbag control unit connector, or moisture or corrosion at the control unitpossible
- Previous accident, repair or trim work that disturbed the airbag wiring or fitted a wrong or non-matching componentpossible
- Faulty airbag control unit driver circuitrare
How to diagnose
- Read all stored and pending codes from the airbag control unit and note the status, any sub-fault information and any other restraint codes, as the pattern points to the circuit affected.
- Check the vehicle history for recent crash damage, seat or dash work, steering column work, or airbag component replacement.
- With the ignition off and the battery disconnected for the time given in the manufacturer's procedure, visually inspect the yellow airbag connectors and wiring near the centre frontal airbag for damage, pinched cable, corrosion or poor locking.
- Check the connectors for bent, pushed-back or spread terminals and for connector locks or shorting clips that are not seated correctly.
- Look at the wiring route for chafing, water ingress or rodent damage, especially under seats and behind the dash.
- Do not probe or apply test current to airbag circuits or initiators. Use only the procedure and approved test method for that model, as the module can deploy.
- Check the vehicle-specific wiring diagram and the manufacturer's fault tree to confirm which component the circuit serves, since layout varies by model.
- After repair, clear the code and confirm it does not return, and that the warning light goes out and the system self-test passes.
How to fix
- Repair or replace damaged wiring and connectors in the affected airbag circuit, using proper connections and not makeshift joins.
- Re-seat, clean or replace corroded or damaged connectors, and make sure the connector locks are fully engaged.
- Replace the faulty centre frontal airbag module or initiator with the correct part for the vehicle, following the manufacturer's safe handling procedure.
- Replace the clockspring or related component if the diagnostic procedure shows it is at fault, where fitted in the circuit.
- Replace or repair the airbag control unit only if the circuit and components are proven good, and then set it up as the manufacturer requires.
Can I keep driving?
Limit driving and have it inspected promptly, because the centre frontal restraint may not deploy correctly in a crash. The car may still drive normally, but the safety system should not be relied on until it is repaired.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.