AutoCodesMitsubishi – B1C28 Mitsubishi

B1C28 Mitsubishi 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 Mitsubishi 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 584
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 Mitsubishi 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 Mitsubishi - Left Side Seat Thorax Squib 1 High - AutoCodes.com
B1C28 Mitsubishi Code - Left Side Seat Thorax Squib 1 High

What are the Possible Causes of the DTC B1C28 Mitsubishi?

  • 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 Mitsubishi?

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 Mitsubishi 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 Mitsubishi code?

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

Need Help with the Code?

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

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 Mitsubishi Code

What does the OBDII code B1C28 mean for a Mitsubishi vehicle?

The B1C28 code indicates a fault with the left side seat thorax airbag squib 1, specifically that it is registering a high resistance or an open circuit.

What are the common symptoms associated with the B1C28 code?

Common symptoms may include the illumination of the airbag warning light on the dashboard and potential malfunction of the seat airbag system.

What can cause the B1C28 code to trigger?

The code can be triggered by issues such as a faulty airbag squib, damaged wiring or connectors in the seat airbag system, or problems with the airbag control module.

How can I diagnose the B1C28 code?

Start by using an OBDII scanner to confirm the code and check for any related codes. Inspect the wiring and connectors for damage, and test the airbag squib for proper resistance.

What should I check first when troubleshooting the B1C28 code?

Begin by visually inspecting the wiring and connectors for the left side seat airbag for any signs of wear, corrosion, or disconnection.

Can I clear the B1C28 code without fixing the issue?

While you can clear the code, it will likely reappear if the underlying issue is not addressed, as the airbag system monitors itself continuously.

Is it safe to drive a vehicle with the B1C28 code?

It is not recommended to drive a vehicle with this code since it indicates an issue with the airbag system, which may not deploy in an accident.

What repairs are typically needed to resolve the B1C28 code?

Repairs may involve replacing the left side seat thorax airbag squib, repairing damaged wiring, or replacing the airbag control module if it is found to be faulty.

How much does it cost to fix the issue related to the B1C28 code?

Repair costs can vary widely based on the specific problem but can range from $100 for minor wiring repairs to $1,000 or more for airbag replacement and labor.

Should I attempt to fix the B1C28 code myself?

If you have experience with automotive electrical systems, you may attempt repairs, but it is often best to consult a professional mechanic, especially for airbag-related issues.

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