Engine-Codes.com
Engine-Codes – Toyota – B1906 Toyota

B1906 Toyota Code - Open in Front Pretensioner Squib Left Circuit

Quick Answer

The B1906 diagnostic trouble code for Toyota vehicles indicates an open circuit in the front pretensioner squib on the left side. Common causes include Corrosion or damage to the wiring harness connected to the front pretensioner squib, Faulty pretensioner squib, Loose or disconnected electrical connection. 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
B1906 Toyota indicates Open in Front Pretensioner Squib Left Circuit.
Common causes
Common causes include Corrosion or damage to the wiring harness connected to the front pretensioner squib, Faulty pretensioner squib, Loose or disconnected electrical connection.
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 09, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B1906 Toyota Description

The B1906 diagnostic trouble code for Toyota vehicles indicates an open circuit in the front pretensioner squib on the left side. The pretensioner squib is a crucial component of the vehicle's safety system, specifically the seatbelt system. In the event of a collision, the pretensioner squib is responsible for tightening the seatbelt and restraining the occupants, reducing the risk of injury.

OBDII Code B1906 Toyota - Open in Front Pretensioner Squib Left Circuit
B1906 Toyota Code - Open in Front Pretensioner Squib Left Circuit

Common Causes of B1906 Toyota

  1. Corrosion or damage to the wiring harness connected to the front pretensioner squib.
  2. Faulty pretensioner squib.
  3. Loose or disconnected electrical connection.
  4. Impact or collision that damaged the pretensioner squib.
  5. Manufacturing defect in the pretensioner squib.

Symptoms of B1906 Toyota

  1. Airbag warning light illuminated on the dashboard.
  2. Seatbelt warning light stays on.
  3. Inability to properly tighten seatbelt during sudden stops or collisions.
  4. Diagnostic trouble code B1906 stored in the vehicle's computer.

How to Fix B1906 Toyota

  1. Begin by diagnosing the specific cause of the open circuit in the front pretensioner squib left circuit. This may involve using a diagnostic scanner to retrieve the trouble codes and performing a visual inspection of the wiring harness and connections.
  2. Repair or replace any damaged wiring harness or connectors. Ensure all connections are secure and free of corrosion.
  3. If the pretensioner squib is faulty, it will need to be replaced with a new one. This may involve removing the seat to access the pretensioner.
  4. Clear the diagnostic trouble codes from the vehicle's computer and test the seatbelt system to ensure proper functionality.
  5. Perform a thorough test drive to verify that the issue has been resolved and that the airbag and seatbelt warning lights are no longer illuminated.

Cost to Fix B1906 Toyota

The cost of repairing an open circuit in the front pretensioner squib left circuit can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of parts for this repair may range from $100 to $300, while labor costs can range from $150 to $400. In total, the repair cost for this issue may fall between $250 and $700. It is advisable to contact local auto repair shops for accurate pricing based on the vehicle make and model.

Need more information about the B1906 Toyota code?

Need more information on how to fix the B1906 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1906 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 B1906 Toyota Code

1. What does the OBDII code B1906 for Toyota mean?

The code B1906 indicates an "Open in Front Pretensioner Squib Left Circuit" on a Toyota vehicle.

2. What are the common symptoms of the B1906 OBDII code in a Toyota?

Common symptoms of the B1906 code may include an illuminated airbag warning light on the dashboard and potential non-deployment of the left front seatbelt pretensioner in the event of a collision.

3. What are the possible causes of the B1906 code in a Toyota?

Possible causes of the B1906 code include a faulty pretensioner squib left circuit, damaged wiring or connectors in the circuit, or a malfunctioning airbag control module.

4. How can I diagnose the B1906 code in my Toyota?

Diagnosing the B1906 code typically involves using a diagnostic scan tool to retrieve the trouble code, inspecting the wiring and connectors related to the left front pretensioner squib circuit, and testing the components for proper functionality.

5. Can I drive my Toyota with the B1906 code?

It is not recommended to drive your Toyota with the B1906 code present, as it indicates a potential safety issue with the airbag system. It is advisable to have the issue diagnosed and repaired promptly.

6. How can I repair the B1906 code in my Toyota?

Repairing the B1906 code may involve repairing or replacing the left front pretensioner squib, repairing damaged wiring or connectors, or reprogramming the airbag control module. It is recommended to have a qualified technician perform the repairs.

7. Will resetting the OBDII code B1906 make it go away permanently?

Resetting the B1906 code may temporarily turn off the warning light, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the code to prevent future occurrences.

8. Is it safe to reset the B1906 code without fixing the issue in my Toyota?

Resetting the B1906 code without fixing the underlying problem is not recommended, as it may pose a safety risk in the event of an accident where the airbag system is needed. It is best to address the issue promptly.

9. Can I repair the B1906 code in my Toyota at home?

Depending on your experience and knowledge of automotive systems, you may be able to diagnose and repair the B1906 code at home. However, due to the critical nature of the airbag system, it is advisable to seek professional help to ensure a proper and safe repair.

10. How much does it cost to fix the B1906 code in a Toyota?

The cost of fixing the B1906 code in a Toyota can vary depending on the root cause of the issue, the required repairs, and labor costs. It is recommended to obtain quotes from reputable repair shops or dealerships for an accurate estimate.

Discuss the causes and fixes for B1906 Toyota OBDII Code

Submit a New Comment

  • B1906 how to fix it or how to switch off airbag warn light to Toyota RAV4 from UK model 2006

    Reply to Comment

    • The diagnostic trouble code B1906 for your 2006 Toyota RAV4 refers to an "Open in Front Pretensioner Squib Left Circuit." This issue is part of the Supplemental Restraint System (SRS), and it's associated with the airbag system. Here’s what it means and how to address it:

      Potential Causes:

      • Faulty Front Seat Outer Belt Assembly (Left Pretensioner Squib)
      • Open or short circuit in the Front Seat Outer Belt Assembly (Left side)
      • Poor electrical connection in the Front Seat Outer Belt Assembly
      • Faulty Center Airbag Sensor Assembly

      How to Fix It:

      1. Inspect the Wiring: Check for any visible damage or disconnections in the wiring related to the seatbelt pretensioner on the driver's side.

      2. Check the Connections: Ensure that the connectors under the seat are properly connected and that there is no corrosion or debris affecting the electrical connections.

      3. Replace Faulty Components: If the wiring and connectors seem fine, the issue might lie with a faulty seatbelt pretensioner or the airbag sensor. This would typically require replacing the faulty Front Seat Outer Belt Assembly (Left) or the Center Airbag Sensor Assembly.

      4. Clear the Code: After resolving the issue, use an OBD-II scanner to clear the code and reset the airbag warning light. If the issue is fixed, the light should remain off.

      If you are not comfortable performing these steps yourself, it's best to consult a professional mechanic, as airbag system repairs can be complex and sensitive to safety.

      Reply to Comment