What is the B0049 Fault Code?
The B0049 fault code, applicable to all car manufacturers, means “Third Row Right Frontal Stage 1 Deployment Control (Subfault)“.
Background Information: Newer cars use multi-stage airbags to regulate the pressure inside the airbag. The higher the pressure, the greater the force of the airbag deployment. The system automatically determines the airbag deployment strength based on parameters such as collision intensity, passenger weight, seat belt usage, child seat presence, and distance from the airbag. This design ensures that the airbag deploys with moderate force in most collisions, reserving maximum force for the most severe collisions.
Symptoms of the B0049 Fault Code
- The airbag light (SRS) is illuminated.
- The SRS light is constantly on or flashing.
- An OBD2 scanner displays code B0049.
- The airbag may not deploy in the event of an accident.
Main Causes of the B0049 Fault Code
- Damaged connector or wiring under the passenger seat
- Oxidation of airbag connector contacts
- Improper replacement or repair of SRS components
- Faulty SRS system control module
How to Diagnose the B0049 Fault Code?
- Read the error code with an OBD2 scanner
- Check the indicator lights on the dashboard
- Check the airbag connector under the passenger seat
- Test the circuit around the airbag module with a multimeter
- Check the SRS module for other errors
Possible Causes and Diagnostic Methods
| Possible Cause | How to Check? |
|---|---|
| Poor airbag connector contact | Visual inspection and testing with a multimeter |
| Broken wire | Check the integrity of the wiring, check for open circuits |
| Contact corrosion | Clean and inspect the connector under the seat |
| Faulty SRS module | Diagnose with a scanner, reset and test |
Tools Needed: OBD2 scanner, multimeter, dielectric grease, contact cleaner
How to Fix Error Code B0049? (Problem Solutions)
Simple Repair Methods
- Disconnect and reconnect the airbag connector
- Clean oxidation from the contact points
- Reset the error code using a scanner after fixing the cause
In-depth Diagnosis and Repair Solutions
- Replace damaged wiring or connectors
- Flash or replace the SRS module
- Perform a comprehensive check of the entire SRS network
Troubleshooting by Symptoms
| Symptom | Possible solution |
|---|---|
| SRS indicator light is on | Check and clean connectors, reset the error |
| Airbag fails to activate | Replace damaged circuit components or modules |
| Constant code B0049 | Diagnose the modules and pyrotechnic devices |
B0049 Fault Code in Different Vehicles
Ford Focus B0049: The error is usually caused by oxidation of the contacts under the seat, which is common in 2005-2011 models.
Opel Astra B0049: The most common cause is damage to the pyro head connector after removing the seat.
Chevrolet Cruze B0049: The weak point is the contact base at the transition between the body and the seat.
Volkswagen Passat B0049: The SRS module may fail, especially after moisture enters the passenger compartment.
B0049 in Nissan Almera: Broken chains or bent seat belts when adjusting the seat are typical.
B0049 Code Frequently Asked Questions
Can you drive with a B0049 fault code?
No. If the pyrotechnic chain fails, the airbag may not deploy in an emergency, posing a risk to passengers.
Can the B0049 error be caused by disconnecting the seat?
Yes. Disconnecting or improperly installing the seat can damage the connector or cause poor contact in the airbag circuit.
Can you reset the B0049 fault code yourself?
You can try resetting the code with a scanner, but if the problem persists, the error will reappear.
Does the B0049 error require replacing the SRS module?
No. First, you need to check the wiring and connectors. The module is only replaced after all other causes have been ruled out.
Will the B0049 error affect the inspection?
Yes. A malfunctioning SRS system is grounds for failing a technical inspection.
B0049 Code Related OBD2 Errors
B0020 – Left Side Airbag Deployment Control (Subfault)
B0051 – First Row Center Seatbelt Sensor (Subfault)
B0091 – Left Side Restraints Sensor 1 (Subfault)
Important! A non-functioning SRS system directly affects your and your passengers’ safety! Do not delay in fixing safety vulnerabilities. Even a single airbag can save lives. If you have even the slightest doubt, please contact a professional for a complete diagnosis!