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Engine-Codes – Generic – B1C28

B1C28 Code - Left Side Seat Thorax Squib 1 High

Quick Answer

The B1C28 diagnostic trouble code (DTC) indicates that there is a high resistance or open circuit in the left side seat thorax squib 1 circuit. Common causes include Faulty seat thorax squib 1, Wiring or connection issues in the left side seat thorax airbag circuit, Corrosion or damage to the connectors or terminals in the 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
B1C28 indicates Left Side Seat Thorax Squib 1 High.
Common causes
Common causes include Faulty seat thorax squib 1, Wiring or connection issues in the left side seat thorax airbag circuit, Corrosion or damage to the connectors or terminals in the 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 14, 2024
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Code B1C28 Description

The B1C28 diagnostic trouble code (DTC) indicates that there is a high resistance or open circuit in the left side seat thorax squib 1 circuit. The seat thorax squib is a component of the vehicle's airbag system that helps protect occupants in the event of a side impact collision. When this code is triggered, it means that there may be a fault in the deployment system of the left side seat thorax airbag, which could potentially compromise the safety of the vehicle's occupants.

OBDII Code B1C28 - Left Side Seat Thorax Squib 1 High
B1C28 Code - Left Side Seat Thorax Squib 1 High

Common Causes of B1C28

  1. Faulty seat thorax squib 1
  2. Wiring or connection issues in the left side seat thorax airbag circuit
  3. Corrosion or damage to the connectors or terminals in the circuit
  4. Impact or collision that may have damaged the seat thorax squib

Symptoms of B1C28

  1. Illumination of the airbag warning light on the dashboard
  2. Inability to turn off the airbag warning light even after resetting
  3. Fault codes related to the airbag system stored in the vehicle's computer
  4. Non-deployment of the left side seat thorax airbag in a crash situation

How to Fix B1C28

  1. Begin by disconnecting the vehicle's battery to prevent accidental deployment of the airbag system.
  2. Inspect the wiring and connectors in the left side seat thorax airbag circuit for any damage, corrosion, or loose connections.
  3. Test the seat thorax squib 1 for proper resistance and functionality using a multimeter.
  4. Replace the faulty seat thorax squib 1 if necessary, following manufacturer's guidelines.
  5. Clear the fault codes from the vehicle's computer and perform a test to ensure that the airbag system is functioning properly.

Cost to Fix B1C28

The cost of repairing a left side seat thorax squib 1 high code can vary depending on the extent of the damage and the specific components that need to be replaced. Generally, the cost of replacing a seat thorax squib can range from $200 to $500, including parts and labor. Additional costs may apply if there are other underlying issues in the airbag system that need to be addressed. It is recommended to consult with a professional mechanic to get an accurate estimate based on the specific make and model of the vehicle. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

When is the Code Detected?

This Diagnostic Trouble Code (DTC) sets when the Occupant Restraint Controller (ORC) detects a short to voltage on the squib circuit for more than 2.5 seconds. This DTC transitions from active to stored when the module sees a recovery from a short to voltage for greater than 2.5 seconds.

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Code B1C28 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 B1C28 Code

1. What are the common symptoms of OBDII code B1C28 (Left Side Seat Thorax Squib 1 High)?

The common symptoms associated with code B1C28 include the airbag warning light illuminating on the dashboard and possible disabling of the airbag system.

2. What could cause the OBDII code B1C28 to trigger?

The code B1C28 is typically triggered by a high resistance or open circuit in the left side seat thorax squib 1, which is a component of the airbag system.

3. How serious is the OBDII code B1C28?

The OBDII code B1C28 is a serious issue as it indicates a potential problem with the airbag system, which could result in the airbags not deploying properly in the event of a collision.

4. Can I continue driving with the OBDII code B1C28 present?

It is not recommended to drive with the OBDII code B1C28 present, as it poses a safety risk due to the potential malfunction of the airbag system.

5. How can I diagnose and repair the OBDII code B1C28?

Diagnosing and repairing the OBDII code B1C28 typically involves checking the wiring and connections to the left side seat thorax squib 1, testing the squib itself, and addressing any faults or damages found.

6. Is it safe to reset the OBDII code B1C28 without fixing the underlying issue?

Resetting the code without fixing the underlying issue may temporarily turn off the warning light, but the problem will persist and could compromise the functionality of the airbag system.

7. Are there any DIY repair tips for addressing the OBDII code B1C28?

DIY repair for the OBDII code B1C28 may involve checking and securing the wiring connections to the left side seat thorax squib 1, but it is recommended to consult a professional for a thorough diagnosis and repair.

8. How much does it typically cost to repair OBDII code B1C28?

The cost of repairing the OBDII code B1C28 can vary depending on the specific cause of the issue, but it may involve replacing the left side seat thorax squib 1 or addressing wiring issues, which can range from moderate to high costs.

9. Can the OBDII code B1C28 be intermittent or sporadic?

Yes, the OBDII code B1C28 can be intermittent or sporadic if the issue with the left side seat thorax squib 1 is not consistently present. However, it still requires attention to ensure the airbag system functions correctly.

10. Will fixing the OBDII code B1C28 require resetting the airbag system?

After repairing the underlying issue causing the OBDII code B1C28, it may be necessary to reset the airbag system using a diagnostic tool to clear the code and ensure proper functionality.

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