Quick Answer: Nissan code B1049 means "Driver Airbag Module Circuit Open" - the airbag control unit has detected a broken electrical path to the driver airbag, almost always caused by a worn or damaged clock spring (spiral cable) in the steering column. Replacing the clock spring clears it in most cases. If the code was set by a crash and the airbag module is now locked, the module itself must be reset or repaired before the light will go off.
If your dashboard is showing the airbag warning light and a scan tool returned Nissan code B1049, your vehicle is telling you the driver airbag circuit is open. This guide explains what B1049 means, what the "B1049-00" sub-code adds, which Nissan models it shows up on most often, how to diagnose the real cause, and how to fix it safely. We repair and reset airbag components every day, so we have written this to be practical - not just a code definition.
What Does Nissan Code B1049 Mean?
B1049 is a manufacturer-specific body code for Nissan and Infiniti, defined as Driver Air Bag Module Circuit - Open. When the airbag control module (also called the SRS unit or occupant restraint controller) runs its self-check, it sends a small monitoring current through the driver airbag circuit. If that current cannot complete the loop, the module logs B1049, turns on the airbag light, and disables that part of the system.
This matters because an open driver airbag circuit means the airbag may not deploy in a crash. The warning light is not a nuisance - it is the safety system telling you it cannot guarantee the driver airbag will fire when needed.
The circuit that B1049 monitors runs from the airbag module, down the steering column through the clock spring (spiral cable), and into the airbag inflator in the steering wheel. The clock spring is a coiled ribbon of wire that keeps this connection alive while the steering wheel turns. It is the single most common failure point for this code.
What Is the Difference Between B1049 and B1049-00?
Newer Nissan scan data often shows the code as B1049-00. The four-digit part (B1049) is the fault itself: driver airbag circuit open. The two-digit suffix after the dash is the failure-type byte that describes the nature of the fault.
- B1049-00 - "no sub-type information." The module confirms an open driver airbag circuit but is not reporting a more specific electrical condition. In practice this is read the same way as a plain B1049.
- Other suffixes (for example a short-to-ground or short-to-power byte) point to a different electrical fault on the same circuit, which changes where you look.
For most owners, B1049 and B1049-00 mean the same thing and point to the same suspect: the clock spring or its connectors.
What Are the Common Causes of Nissan B1049?
After working through hundreds of these, the causes fall into a predictable order from most to least common:
- Worn or broken clock spring (spiral cable) - the coiled ribbon inside eventually cracks from years of steering, breaking the circuit. This is the number one cause.
- Loose, corroded, or unseated connectors - the yellow airbag connector under the steering wheel or under the seat can back out after service, or corrode over time.
- Damaged wiring in the steering column - chafed or pinched wires after steering column, airbag, or ignition work.
- Faulty driver airbag inflator - less common, but a failed squib inside the airbag itself reads as an open circuit.
- Locked airbag control module after a crash - if the vehicle was in a collision, the module may have stored hard crash data and locked. Even with good wiring, the code will not clear until the module is reset or replaced.
Which Nissan Models Get Code B1049 Most Often?
B1049 can appear on almost any Nissan or Infiniti with a monitored driver airbag circuit, but we see it repeatedly on a handful of models. The fix is the same family of parts across all of them - the clock spring behind the steering wheel.
| Model | What we typically see with B1049 |
|---|---|
| Nissan Qashqai | One of the most frequent B1049 vehicles. Usually a failed clock spring; the light often appears alongside a non-working horn or steering-wheel buttons. |
| Nissan Rogue | Common clock spring failure, sometimes paired with other body codes. Steering-wheel controls going dead is a strong clue. |
| Nissan Altima | Clock spring wear on higher-mileage cars; also check the connector under the driver seat. |
| Nissan Note / Micra | Frequent European-market B1049 cases, almost always the spiral cable. |
| Nissan GT-R | Less common, but the same open-circuit logic applies; inspect the clock spring and column connectors first. |
| Murano, Xterra, Quest, Sentra | All share the same circuit design and the same primary suspect - the clock spring. |
If the steering-wheel horn or audio and cruise buttons stopped working at the same time the airbag light came on, that is a near-certain sign the clock spring is the culprit, because those controls run through the same part.
How Do You Diagnose Nissan B1049 Correctly?
Confirm the cause before buying parts. A basic OBD-II reader usually will not show body codes like B1049 - you need an enhanced or Nissan-capable scan tool (CONSULT-style) to read SRS codes.
- Read and record the code: Confirm B1049 / B1049-00 and note any companion codes.
- Visual inspection: With the battery disconnected, check the steering column and the yellow airbag connectors for damage, corrosion, or a connector that has backed out.
- Check the connectors: Reseat the driver airbag connector and the connector under the seat. A surprising number of "faults" are just a loose plug after prior service.
- Test the clock spring: With the airbag safely removed and the battery disconnected, a technician can check continuity across the spiral cable. An open reading confirms a failed clock spring.
Safety note: The airbag system stores energy and can deploy unexpectedly. Airbag diagnosis and repair should be handled by a professional unless you are experienced with SRS work. A misfired airbag can cause serious injury.
How Do You Fix and Clear Code B1049?
Once the clock spring is confirmed faulty, this is the repair path:
- Disconnect the battery and wait: Wait at least 10 to 15 minutes so the SRS backup capacitor fully discharges before touching anything.
- Remove the steering wheel: Take off the driver airbag, disconnect it, then remove the center nut and pull the wheel. Mark the position so it goes back straight.
- Replace the clock spring: Remove the old spiral cable and install the new one. Center it exactly per the arrows or window marks - an off-center clock spring will tear itself apart and set B1049 again immediately.
- Reassemble: Reinstall the steering wheel, airbag, and trim, torqued to spec.
- Clear the code and test: Reconnect the battery, clear the SRS memory with the scan tool, and confirm the airbag light goes out. Test the horn and steering-wheel controls, then take a short drive.
If you replaced the clock spring and B1049 still will not clear, the airbag control module itself may be locked - most often because the car was previously in an accident and the module stored crash data. In that case, no amount of wiring work will turn the light off. The module has to be reset back to factory condition.
When Should You Reset or Repair the Airbag Module Instead?
There are two situations where the fix is the module, not the wiring:
The code persists after a good clock spring repair
If the circuit tests good and the connectors are solid but B1049 stays stored, the control module has likely latched the fault or is holding crash data. Our airbag module reset service clears stored crash data and SRS codes and returns the module to its original, ready state - usually with a 24-hour turnaround.
The vehicle was in a collision
After any deployment or hard impact, the module locks. Replacing airbags without resetting the module leaves the light on and the system disabled. Mailing us the module is far cheaper than a dealer replacement, and you get back the same unit reprogrammed to factory specification.
If your diagnosis points to a related steering-column part rather than the airbag itself, our steering sensor and column repair service covers those components too.
How to Handle a Nissan B1049 Code
Nissan B1049 (and B1049-00) means an open driver airbag circuit, and on models like the Qashqai, Rogue, Altima, and Note it is almost always a failed clock spring. Confirm it with a proper scan and a continuity check, replace the spiral cable, then clear the SRS memory. If the light stays on after a clean repair - or if the car was ever in a crash - the airbag control module is locked and needs to be reset.
That is exactly what we do. Send us your airbag module and we return it fully reset to factory condition, all crash codes cleared, backed by a lifetime warranty and 24-hour turnaround. Start your mail-in airbag module reset or contact our team if you are not sure which part you need - we are happy to help you identify it.
Leave a comment
This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.