What it means
The restraint control module monitors the stage 2 deployment circuit for the second-row right frontal airbag. It sets this code when it detects an electrical fault in that circuit, such as an open, short, or resistance outside its expected range.
At a glance
- Usually lights the airbag (SRS) or body-system warning light
How it works
The restraint control module monitors stage 2 of the second-row right frontal airbag deployment circuit. B003A means it has detected an electrical fault in that stage's path, with the subfault details helping identify an open, short, or out-of-range condition.
Common causes
Most likely first.
- Open or high resistance in the stage 2 inflator circuit
- Shorted or damaged wiring
- Loose or corroded connector
- Fault in the restraint control module
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
How to diagnose it
- Read the SRS subfault and event data to confirm stage 2 of the second-row right frontal airbag is the affected circuit.
- Inspect the right seatback airbag harness for pinching, corrosion, looseness, or damage related to seat movement or upholstery work.
- Disable the SRS using the manufacturer's procedure before inspecting accessible stage 2 connectors; do not probe inflator terminals.
- Use approved SRS test equipment to check stage 2 for the reported open, short, or resistance outside specification.
- If wiring checks pass, test the airbag module and restraint control module according to the service procedure and rescan after repair.
Common fixes
- Reconnect a loose stage 2 connection or repair damaged seatback wiring with the approved SRS procedure.
- Repair a confirmed open or short in the second-row right stage 2 deployment circuit.
- Replace the airbag module if its stage 2 circuit fails the manufacturer's specified test.
- Replace or program the restraint control module only after the stage 2 circuit and module are verified.
Can I keep driving?
The second-row right frontal airbag's stage 2 deployment may be impaired, reducing rear-passenger protection in a crash. Have the SRS fault repaired promptly and avoid disturbing the seatback airbag wiring.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.