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B1933 Mazda Code - Air Bag Passenger Circuit Open Fault

Quick Answer

The B1933 diagnostic trouble code (DTC) for Mazda vehicles indicates an issue with the airbag system's passenger circuit being open. Common causes include Loose or damaged wiring in the passenger airbag circuit, Faulty passenger airbag module, Corrosion or poor connections in the airbag system. 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
B1933 Mazda indicates Air Bag Passenger Circuit Open Fault.
Common causes
Common causes include Loose or damaged wiring in the passenger airbag circuit, Faulty passenger airbag module, Corrosion or poor connections in the airbag system.
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 16, 2024
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Code B1933 Mazda Description

The B1933 diagnostic trouble code (DTC) for Mazda vehicles indicates an issue with the airbag system's passenger circuit being open. This means that there is a break or interruption in the electrical connection that prevents the airbag from deploying in the event of a collision. The airbag system is a crucial safety feature designed to protect passengers in the event of a crash, and any fault in the system can compromise the vehicle's occupant protection.

OBDII Code B1933 Mazda - Air Bag Passenger Circuit Open Fault
B1933 Mazda Code - Air Bag Passenger Circuit Open Fault

Common Causes of B1933 Mazda

  1. Loose or damaged wiring in the passenger airbag circuit
  2. Faulty passenger airbag module
  3. Corrosion or poor connections in the airbag system
  4. Defective airbag sensor
  5. Impact or collision that damaged the airbag system components

Symptoms of B1933 Mazda

  1. Airbag warning light on the dashboard
  2. Inability to pass a vehicle safety inspection
  3. Non-deployment of the passenger-side airbag in a collision
  4. Audible warning chime indicating an airbag system fault
  5. Diagnostic trouble code B1933 stored in the vehicle's computer system

How to Fix B1933 Mazda

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the specific DTC (B1933) and pinpoint the exact location of the fault in the airbag system.
  2. Inspect wiring and connections: Check the wiring harness, connectors, and terminals in the passenger airbag circuit for any signs of damage, corrosion, or looseness. Repair or replace as necessary.
  3. Test airbag components: Test the passenger airbag module, sensor, and related components to ensure they are functioning correctly. Replace any faulty parts.
  4. Clear DTC and reset system: After completing the repairs, clear the DTC from the vehicle's computer system and reset the airbag system to ensure proper operation.
  5. Verify repair: Conduct a thorough test drive and check the airbag warning light to confirm that the issue has been resolved and the airbag system is functioning as intended.

Cost to Fix B1933 Mazda

The cost of repairing a B1933 airbag passenger circuit open fault can vary depending on the extent of the damage, the specific components that need to be replaced, and the labor rates at the auto repair shop. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is essential to note that the actual cost may be higher or lower based on the factors mentioned earlier. It is recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate for your specific vehicle.

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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 B1933 Mazda Code

1. What does the OBDII code B1933 indicate on a Mazda?

- Code B1933 indicates a fault in the airbag system, specifically mentioning that there is an "Air Bag Passenger Circuit Open" condition in the passenger airbag circuit.

2. What are common symptoms of code B1933 in a Mazda?

- The most noticeable symptom is the airbag warning light on the dashboard being illuminated. There may not be any other noticeable symptoms affecting driving, but the passenger airbag might not deploy in the event of an accident.

3. What causes the OBDII code B1933 to appear on a Mazda?

- This code is typically triggered by issues such as a broken wire, loose connections, or faults in the passenger airbag module connectors. Corrosion or damage in the wiring harness can also be a cause.

4. How is the B1933 code diagnosed in a Mazda?

- Diagnosis involves using a scan tool to confirm the presence of the code, visually inspecting the airbag system's wiring and connectors for damage or disconnections, and checking the resistance in the passenger airbag circuit to identify open circuits.

5. What are the risks of driving a Mazda with the B1933 code active?

- Driving with this code active can be risky as it indicates that the passenger airbag may not deploy in the event of a crash, increasing the risk of injury to the passenger.

6. How can I fix the B1933 code on my Mazda?

- Repairing this code may involve reconnecting or replacing damaged connectors, repairing or replacing damaged wires in the passenger airbag circuit, or replacing the passenger airbag module if necessary.

7. Is it necessary to reset the airbag light after repairing the B1933 code in a Mazda?

- Yes, after the necessary repairs have been made, it is important to clear the code with an OBDII scanner and ensure the airbag light turns off, confirming that the system is functioning correctly.

8. Can I repair the B1933 code issue myself or should I see a professional?

- If you have experience with car electrical systems, you might manage simpler tasks like checking connectors. However, airbag system repairs can be complex and potentially hazardous, so it’s often recommended to seek assistance from a qualified professional.

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