What it means
The restraint control module monitors the stage 1 deployment circuit for the third-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 1 of the third-row right frontal airbag's deployment circuit. B0049 sets when that stage 1 circuit has an electrical fault, such as an open, short, or resistance outside its expected range.
Common causes
Most likely first.
- Open or high resistance in the stage 1 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
- Use an SRS-capable scan tool to read B0049's subfault details and freeze-frame or event data, noting whether stage 1's fault is current or intermittent.
- With the vehicle safely powered down under the manufacturer's procedure, inspect the third-row right frontal stage 1 wiring and connectors for damage, corrosion, poor seating, or prior repairs.
- Use the manufacturer's wiring diagram and prescribed SRS-safe test method to check the stage 1 circuit for an open or short.
- Check stage 1 circuit resistance and connector contact against the manufacturer's procedure and specification; do not measure across the inflator unless explicitly allowed.
- If the stage 1 circuit passes, follow the diagnostic steps to distinguish an airbag-module fault from a restraint control module fault.
Common fixes
- Repair damaged wiring in the third-row right frontal stage 1 circuit.
- Correct a loose or corroded stage 1 connector using the manufacturer's SRS procedure.
- Replace the airbag module if the stage 1 circuit fails its specified test.
- Repair or replace the restraint control module if the circuit and airbag module pass and module diagnosis confirms the fault.
Can I keep driving?
The third-row right frontal airbag's stage 1 may not deploy correctly in a crash; arrange prompt SRS diagnosis and avoid using that seating position until repaired. Follow the manufacturer's safety procedure before any work near 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.