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Engine-Codes – Generic – B1B12

B1B12 Code - Driver Knee Bolster Squib Circuit Open

Quick Answer

The B1B12 diagnostic trouble code (DTC) refers to a Driver Knee Bolster Squib Circuit Open. Common causes include Damaged wiring or connectors in the driver knee bolster airbag circuit, Corrosion or poor connections in the circuit, Faulty driver knee bolster airbag module. 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
B1B12 indicates Driver Knee Bolster Squib Circuit Open.
Common causes
Common causes include Damaged wiring or connectors in the driver knee bolster airbag circuit, Corrosion or poor connections in the circuit, Faulty driver knee bolster airbag module.
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 12, 2024
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Code B1B12 Description

The B1B12 diagnostic trouble code (DTC) refers to a Driver Knee Bolster Squib Circuit Open. This means that there is an issue with the circuit responsible for the driver's knee bolster airbag system in the vehicle. The knee bolster airbag is designed to provide additional protection for the driver's knees and legs in the event of a collision. When this circuit is open, it indicates that there is a break or interruption in the electrical connection, preventing the proper deployment of the airbag in case of a crash.

OBDII Code B1B12 - Driver Knee Bolster Squib Circuit Open
B1B12 Code - Driver Knee Bolster Squib Circuit Open

Common Causes of B1B12

  1. Damaged wiring or connectors in the driver knee bolster airbag circuit.
  2. Corrosion or poor connections in the circuit.
  3. Faulty driver knee bolster airbag module.
  4. Impact or collision that caused damage to the airbag system components.
  5. Manufacturing defects in the airbag system components.

Symptoms of B1B12

  1. Airbag warning light is illuminated on the dashboard.
  2. The airbag system may fail a self-diagnostic test.
  3. The driver knee bolster airbag may not deploy in a crash.
  4. Diagnostic trouble codes related to the airbag system may be stored in the vehicle's computer.
  5. Vehicle may fail a safety inspection due to the airbag system issue.

How to Fix B1B12

  1. Begin by diagnosing the specific cause of the open circuit using a professional diagnostic scan tool.
  2. Inspect the wiring harness and connectors related to the driver knee bolster airbag system for damage or corrosion.
  3. Repair or replace any damaged wiring, connectors, or components in the circuit.
  4. Clear the DTCs from the vehicle's computer and perform a test to ensure the issue is resolved.
  5. If necessary, recalibrate or reset the airbag system to ensure proper functioning.

Cost to Fix B1B12

The cost of repairing a Driver Knee Bolster Squib Circuit Open issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, the repair for this type of airbag system issue may range from $200 to $500, including parts and labor. However, it's important to note that prices can fluctuate based on the severity of the damage, the need for replacement parts, and the time required for diagnosis and repair. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary widely, so it's advisable to shop around for the best price and quality service.

When is the Code Detected?

This Diagnostic Trouble Code (DTC) sets when the ORC detects an open on the driver knee bolster squib circuit for more than 2.5 seconds. This DTC transitions from active to stored when the ORC sees a recovery from a short to ground for greater than 2.5 seconds.

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Code B1B12 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 B1B12 Code

1. What does the OBDII code B1B12 mean?

The code B1B12 indicates an open circuit in the driver knee bolster squib, which is part of the airbag system designed to protect the driver’s knees in a collision.

2. What are the common symptoms of the B1B12 code?

Symptoms may include an illuminated airbag warning light on the dashboard and the airbag system being disabled or unable to deploy properly.

3. What causes the B1B12 code to appear?

Common causes include damaged wiring or connectors in the airbag system, a faulty knee bolster airbag module, or a malfunctioning clock spring in the steering wheel.

4. Can I drive with the B1B12 code active?

It is not recommended to drive with this code active, as it means the airbag system may not function correctly in the event of a collision.

5. How is the B1B12 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the airbag module and related components for continuity and proper function.

6. How can I fix the B1B12 code?

Repairs may involve repairing or replacing damaged wiring, reconnecting loose connectors, or replacing the knee bolster airbag module if it is defective.

7. Is the B1B12 code covered under warranty?

This depends on your vehicle’s warranty coverage. Airbag systems often have extended warranties, so check with your manufacturer or dealer.

8. What tools are needed to fix the B1B12 code?

You’ll need an OBDII scan tool, a multimeter for testing continuity, and possibly specialized tools for airbag system repairs, like a clock spring removal tool.

9. How much does it cost to fix the B1B12 code?

Repair costs vary but can range from $100 for minor wiring repairs to $1,000 or more if the airbag module or clock spring requires replacement.

10. Can I reset the B1B12 code without fixing the issue?

You can clear the code with an OBDII scanner, but it will likely return if the underlying issue is not resolved. Additionally, the airbag system may remain disabled.

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