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Engine-Codes – Generic – B1C29

B1C29 Code - Left Side Seat Thorax Squib 1 Open

Quick Answer

The B1C29 code indicates that there is an issue with the left side seat thorax squib 1, which is a component of the vehicle's airbag system. Common causes include Wiring harness damage or corrosion, Faulty seat thorax squib, Loose or disconnected electrical connections. 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
B1C29 indicates Left Side Seat Thorax Squib 1 Open.
Common causes
Common causes include Wiring harness damage or corrosion, Faulty seat thorax squib, Loose or disconnected electrical connections.
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 Aug 25, 2024
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Code B1C29 Description

The B1C29 code indicates that there is an issue with the left side seat thorax squib 1, which is a component of the vehicle's airbag system. The seat thorax squib is responsible for deploying the airbag in the event of a collision or impact. An "open" circuit means that there is a break or disruption in the electrical connection that prevents the squib from functioning properly. This can pose a serious safety risk as the airbag may not deploy as intended in the event of an accident, potentially resulting in increased injury to the occupant.

OBDII Code B1C29 - Left Side Seat Thorax Squib 1 Open
B1C29 Code - Left Side Seat Thorax Squib 1 Open

Common Causes of B1C29

  1. Wiring harness damage or corrosion
  2. Faulty seat thorax squib
  3. Loose or disconnected electrical connections
  4. Impact or collision that damaged the airbag system
  5. Manufacturing defect in the seat thorax squib

Symptoms of B1C29

  1. Airbag warning light illuminated on the dashboard
  2. Disconnection of the airbag system
  3. Inability to deploy the airbag in a collision
  4. Fault codes related to the airbag system stored in the vehicle's computer

How to Fix B1C29

  1. Conduct a thorough inspection of the wiring harness and electrical connections to identify any damage or corrosion.
  2. Test the seat thorax squib for proper functionality using a multimeter.
  3. Replace the faulty seat thorax squib if necessary.
  4. Repair any damaged wiring or connections in the airbag system.
  5. Clear the fault codes from the vehicle's computer and reset the airbag system.

Cost to Fix B1C29

The cost of repairing a left side seat thorax squib 1 open issue can vary depending on the extent of the damage and the specific vehicle make and model. In general, the cost of parts for a new seat thorax squib ranges from $100 to $300, while labor costs can range from $100 to $200. Overall, the total repair cost can be estimated to be between $200 to $500. It is important to note that these are rough estimates, and actual costs may vary based on individual circumstances and location. Be sure to consult with a qualified mechanic or repair shop for a more accurate cost assessment.

When is the Code Detected?

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

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Code B1C29 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 B1C29 Code

1. What does OBDII code B1C29 mean?

Code B1C29 indicates an open circuit in the left side seat thorax airbag (squib) system, which can prevent the airbag from deploying properly in an accident.

2. What are the common symptoms of code B1C29?

The most common symptoms include the airbag warning light illuminated on the dashboard and the left-side seat thorax airbag being non-functional.

3. What causes OBDII code B1C29?

This code is typically caused by damaged wiring, a loose or corroded connector, a faulty airbag module, or a defective squib (airbag inflator).

4. Can I still drive my car with a B1C29 code?

While the vehicle may still be drivable, the left thorax airbag may not deploy in the event of a collision, compromising safety. It’s recommended to address the issue promptly.

5. How do I diagnose a B1C29 code?

Diagnosing involves using an OBDII scanner to confirm the code, visually inspecting the wiring and connectors for damage, and testing the airbag circuit with specialized tools.

6. What tools are needed to repair a B1C29 code?

You may need an OBDII scanner, a multimeter to test electrical circuits, and potentially specialized airbag system diagnostic tools.

7. Is fixing a B1C29 code dangerous?

Yes, working on airbag systems can be dangerous due to the risk of accidental deployment. It’s recommended to disconnect the battery and consult a professional if unsure.

8. How much does it cost to fix code B1C29?

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if the airbag module or squib needs replacement.

9. Can I clear the B1C29 code without fixing the issue?

Clearing the code without addressing the root cause will only temporarily turn off the warning light, and the issue will likely reoccur.

10. Should I take my car to a professional for code B1C29?

Yes, due to the complexity and safety risks involved with airbag systems, it’s best to have the issue diagnosed and repaired by a certified technician.

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