AutoCodes – Mazda – B2779 Mazda

B2779 Mazda Code - Passenger Side Curtain Air Bag Module Circuit Short To Body Ground

Quick Answer

The Sophisticated Air Bag Sensor (SAS) Control Module monitors the Passenger Side Curtain Air Bag Module. Common causes include Faulty Passenger Side Curtain Air Bag Module, Passenger Side Curtain Air Bag Module harness is open or shorted, Passenger Side Curtain Air Bag Module 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: B2779 Mazda indicates Passenger Side Curtain Air Bag Module Circuit Short To Body Ground.
Common causes: Common causes include Faulty Passenger Side Curtain Air Bag Module, Passenger Side Curtain Air Bag Module harness is open or shorted, Passenger Side Curtain Air Bag Module 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 1,276

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2779 Mazda Description

The Sophisticated Air Bag Sensor (SAS) Control Module monitors the Passenger Side Curtain Air Bag Module. The SAS Control Module sets the OBDII code when the Passenger Side Curtain Air Bag Module is not to factory specifications.

OBDII Code B2779 Mazda - Passenger Side Curtain Air Bag Module Circuit Short To Body Ground - AutoCodes.com — B2779 Mazda Code - Passenger Side Curtain Air Bag Module Circuit Short To Body Ground

What does this mean?

What are the Possible Causes of the DTC B2779 Mazda?

Faulty Passenger Side Curtain Air Bag Module
Passenger Side Curtain Air Bag Module harness is open or shorted
Passenger Side Curtain Air Bag Module circuit poor electrical connection
Faulty Sophisticated Air Bag Sensor (SAS)

How to Fix the DTC B2779 Mazda?

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 B2779 Mazda 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 B2779 Mazda code?

Need more information on how to fix the B2779 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2779 Mazda 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 B2779 Mazda Code

1. What does the OBDII code B2779 indicate on a Mazda?

The code B2779 indicates that there is a circuit short to body ground in the passenger side curtain air bag module. This means there is an unwanted connection between the airbag's circuit and the vehicle's chassis, which can affect the airbag's performance.

2. What are common symptoms of code B2779 in a Mazda?

Common symptoms include the airbag warning light illuminating on the dashboard, the passenger side curtain airbag failing to deploy in a collision, and possible other abnormal airbag system warnings.

3. What causes the B2779 code to appear on a Mazda?

Causes of the B2779 code can include damaged wiring, faulty connectors, or a malfunction in the passenger side curtain airbag module itself. External factors like vehicle accidents or moisture intrusion can also lead to this issue.

4. How can I fix the B2779 code on my Mazda?

Repairing this code may involve inspecting and repairing the wiring and connectors associated with the passenger side curtain airbag module. If the module itself is faulty, it might need to be replaced. It's often recommended to have a professional technician handle airbag system repairs due to their complexity and the importance of proper function for safety.

5. Is it safe to drive my Mazda with the B2779 code?

While the vehicle can still operate, driving with an active B2779 code is not advised. Since it pertains to the airbag system, it compromises passenger safety in the event of an accident. It is best to address this issue promptly.

6. What tools are required to diagnose the B2779 code on a Mazda?

Diagnosing the B2779 code typically requires an OBDII scanner capable of reading airbag system codes, and a digital multimeter to test wiring continuity and shorts. Additionally, an inspection of the airbag system components will likely be necessary.

7. How often do curtain airbag module circuits experience shorts like in code B2779?

Shorts in the curtain airbag module circuit are not exceedingly common but can occur, especially in older vehicles or those that have been involved in accidents where the airbag system may have been affected. Regular vehicle maintenance and inspections can help prevent such issues.

8. Will fixing the B2779 code require recalibration of the airbag system on my Mazda?

After repairing the issue causing the B2779 code, recalibration of the airbag system is typically necessary to ensure all components are communicating properly and functioning as expected. This helps guarantee the safety and effectiveness of the airbag system.

9. Can I clear the B2779 code by disconnecting the battery?

Disconnecting the battery can reset the vehicle's electronic systems, possibly clearing the code temporarily. However, this does not address the underlying issue and the code is likely to reappear. Proper diagnosis and repair are required to permanently clear the code.