What it means
The restraint control module monitors the stage 3 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 3 of the second-row right frontal airbag deployment circuit. B003B identifies an electrical fault specific to that stage; the accompanying subfault information indicates what circuit condition was detected.
Common causes
Most likely first.
- Open or high resistance in the stage 3 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 verify the fault is on stage 3 of the second-row right frontal airbag.
- Inspect the right seatback airbag harness and connectors for pinching, corrosion, looseness, or damage from seat or upholstery work.
- Disable the SRS according to the vehicle procedure before handling connectors, and do not measure directly across an inflator.
- Test stage 3 with approved SRS equipment for an open, short, or resistance outside manufacturer specification as indicated by the subfault.
- If the wiring passes, follow the service procedure to assess the airbag module and restraint control module, then clear and rescan.
Common fixes
- Secure a loose stage 3 connector or repair damaged right seatback wiring using the approved SRS method.
- Repair a confirmed open or short in the second-row right stage 3 deployment circuit.
- Replace the airbag module if stage 3 fails the manufacturer's specified test.
- Replace or program the restraint control module only after the stage 3 circuit and airbag module are verified.
Can I keep driving?
Stage 3 of the second-row right frontal airbag may not deploy as intended, reducing occupant protection in a crash. Arrange prompt SRS diagnosis 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.