AutoCodesGeneric – B1C28

B1C28 Code - Left Side Seat Thorax Squib 1 High

Quick Answer

When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. Common causes include Faulty Left Thorax Side Air Bag, Left Thorax Side Air Bag harness is open or shorted, Left Thorax Side Air Bag circuit poor 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
B1C28 indicates Left Side Seat Thorax Squib 1 High.
Common causes
Common causes include Faulty Left Thorax Side Air Bag, Left Thorax Side Air Bag harness is open or shorted, Left Thorax Side Air Bag circuit poor 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.
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Code Popularity 820
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Aug 26, 2019
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Code B1C28 Description

When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. These circuits are maintained in a floating configuration at the module (connected to neither power nor ground) as protection against inadvertent deployment. The use of the Supplemental Restraint System (SRS) Load Tool provides a test point as well as a method for opening the shorting bar connections within the harness connector. The ORC sends out a 40 mA diagnostic current on each squib voltage supply circuit at power up and every 500 ms thereafter while the ignition is on.
OBDII Code B1C28 - Left Side Seat Thorax Squib 1 High - AutoCodes.com
B1C28 Code - Left Side Seat Thorax Squib 1 High

What are the Possible Causes of the DTC B1C28?

  • Faulty Left Thorax Side Air Bag
  • Left Thorax Side Air Bag harness is open or shorted
  • Left Thorax Side Air Bag circuit poor electrical connection
  • Faulty Occupant Restraint Controller (ORC)

How to Fix the DTC B1C28?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1C28 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1C28 code?

Need more information on how to fix the B1C28 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1C28 code diagnosed by a professional: Find a repair shop in your area

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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