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Engine-Codes – Generic – B1149

B1149 Code - Front Airbag Sensor LH Circuit Malfunction

Quick Answer

The B1149 diagnostic trouble code indicates a malfunction in the Front Airbag Sensor LH circuit of the vehicle's airbag system. Common causes include Faulty front airbag sensor LH, Damaged wiring or connectors in the sensor circuit, Corrosion or moisture intrusion in the sensor circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1149 indicates Front Airbag Sensor LH Circuit Malfunction.
Common causes
Common causes include Faulty front airbag sensor LH, Damaged wiring or connectors in the sensor circuit, Corrosion or moisture intrusion in the sensor circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 05, 2024
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Code B1149 Description

The B1149 diagnostic trouble code indicates a malfunction in the Front Airbag Sensor LH circuit of the vehicle's airbag system. The front airbag sensor LH is responsible for detecting impacts and sending signals to deploy the airbags in case of a collision. When this sensor circuit malfunctions, it can lead to the airbags not deploying properly in the event of an accident, compromising the vehicle's safety system.

OBDII Code B1149 - Front Airbag Sensor LH Circuit Malfunction
B1149 Code - Front Airbag Sensor LH Circuit Malfunction

Common Causes of B1149

  1. Faulty front airbag sensor LH
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or moisture intrusion in the sensor circuit
  4. Impact or collision damaging the sensor or wiring
  5. Electronic control unit (ECU) failure related to the airbag system

Symptoms of B1149

  1. Airbag warning light illuminated on the dashboard
  2. Intermittent or constant beeping sound from the airbag system
  3. Airbags not deploying in a collision
  4. Erratic behavior of the airbag system
  5. Vehicle failing airbag system self-test upon startup

How to Fix B1149

  1. Begin by diagnosing the exact cause of the malfunction using a diagnostic scan tool to retrieve the specific error codes.
  2. Inspect the front airbag sensor LH, wiring, and connectors for any damage, corrosion, or loose connections.
  3. Repair or replace any damaged wiring or connectors in the sensor circuit.
  4. Replace the front airbag sensor LH if it is found to be faulty.
  5. Clear the error codes and reset the airbag system to ensure proper functionality.

Cost to Fix B1149

The typical repair costs for addressing a Front Airbag Sensor LH Circuit Malfunction can range from $200 to $500, including parts and labor. However, the final cost may vary depending on the extent of the damage, the cost of the sensor, and the labor rates at the auto repair shop. It's recommended to consult with a professional technician to get an accurate estimate for your specific vehicle.

Need more information about the B1149 code?

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Code B1149 Information for Specific Makes

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1149 Code

1. What are the common symptoms of OBDII code B1149 (Front Airbag Sensor LH Circuit Malfunction)?

- Common symptoms include the airbag warning light illuminating on the dashboard, the airbag system not deploying in a collision, and potential issues with the entire airbag system.

2. What are the possible causes of OBDII code B1149?

- The code can be triggered by a faulty front airbag sensor LH, damaged wiring or connectors in the circuit, a short circuit, or a problem with the airbag control module.

3. How serious is OBDII code B1149?

- This code indicates a malfunction in the front airbag sensor LH circuit, which can compromise the proper functioning of the airbag system. It is crucial to address this issue promptly to ensure the safety features of the vehicle are fully operational.

4. Can I drive my vehicle with OBDII code B1149?

- It is not recommended to drive the vehicle with this code present, as the airbag system may not deploy correctly in the event of a collision. It is advised to have the issue diagnosed and repaired before driving the vehicle.

5. How can I diagnose OBDII code B1149?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the fault codes, inspecting the front airbag sensor LH and its wiring, checking for any visible damage, and testing the airbag system for proper function.

6. What is the typical repair for OBDII code B1149?

- The repair for this code may involve replacing the front airbag sensor LH, repairing or replacing damaged wiring or connectors, addressing any short circuits, or reprogramming the airbag control module.

7. Can I reset OBDII code B1149 on my own?

- While you can clear the fault code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring. Clearing the code without fixing the problem will not resolve the issue.

8. How much does it cost to repair OBDII code B1149?

- The cost of repairing this code can vary depending on the specific cause of the malfunction, the cost of parts needed for the repair, and labor charges. It is advisable to consult a professional mechanic for an accurate estimate.

9. Are there any safety precautions to take when dealing with OBDII code B1149?

- When working on the airbag system or related components, it is essential to disconnect the vehicle's battery and wait for a few minutes before starting any repairs to prevent accidental deployment of the airbags.

10. Will OBDII code B1149 affect my vehicle's performance?

- While the code itself may not directly impact the performance of the vehicle, it can compromise the safety features related to the airbag system. It is crucial to address this code promptly to ensure the overall safety of the vehicle.

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