B1928 Code - Air Bag Safing Sensor Output Circuit Failure

Quick Answer

The B1928 diagnostic trouble code (DTC) indicates an issue with the airbag safing sensor output circuit in the vehicle's airbag system. Common causes include Faulty airbag safing sensor, Damaged wiring or connectors in the airbag system circuit, Malfunctioning airbag control 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

B1928 indicates Air Bag Safing Sensor Output Circuit Failure.

Common causes

Common causes include Faulty airbag safing sensor, Damaged wiring or connectors in the airbag system circuit, Malfunctioning airbag control 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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
• Comments
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Common Causes of B1928

Symptoms of B1928

How to Fix B1928

Cost to Fix B1928

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Code B1928 Information for Specific Makes

• B1928 Lexus — Short To Positive In Rear Pretensioner Squib LH Circuit
• B1928 Scion — Short To Positive In Rear Pretensioner Squib LH Circuit
• B1928 Toyota — Short To Positive In Rear Pretensioner Squib LH Circuit

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 B1928 Code

What does OBDII code B1928 mean?

OBDII code B1928 indicates a failure in the airbag safing sensor output circuit, which is responsible for determining whether to deploy the airbags during a collision.

What are the common symptoms associated with code B1928?

Common symptoms include the airbag warning light being illuminated on the dashboard and possible airbag system malfunctions, such as non-deployment during an accident.

What can cause the B1928 code to trigger?

Causes may include a faulty safing sensor, damaged wiring or connectors in the airbag system, or issues with the vehicle's airbag control module.

How can I diagnose the issue related to code B1928?

To diagnose the issue, use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, and test the safing sensor and airbag control module for proper functionality.

Can I clear the B1928 code without fixing the problem?

While you can clear the code using an OBDII scanner, it is not recommended because the underlying issue must be addressed to ensure the airbag system functions correctly.

What should I do if I see the B1928 code?

It is advisable to take your vehicle to a qualified mechanic or dealership to properly diagnose and repair the airbag system to ensure safety.

Are there any safety risks associated with code B1928?

Yes, if the safing sensor circuit is faulty, it can prevent the airbags from deploying in the event of a collision, posing a significant safety risk.

How much might it cost to repair a B1928 code issue?

Repair costs can vary widely depending on the cause, but they may range from $100 for minor wiring repairs to $1,000 or more for a defective safing sensor or airbag control module replacement.

Can I perform the repairs for code B1928 myself?

If you have experience with automotive electrical systems and safety protocols, you may attempt the repairs, but it is generally recommended to have a professional handle airbag system repairs due to safety concerns.