B1931 Code - Air Bag Crash Sensor 1 Feed/Return Circuit Failure
Quick Answer
The Air Bag Control Module monitors the Air Bag Crash Sensor 1. Common causes include Faulty Air Bag Crash Sensor 1, Air Bag Crash Sensor 1 harness is open or shorted, Air Bag Crash Sensor 1 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
- B1931 indicates Air Bag Crash Sensor 1 Feed/Return Circuit Failure.
- Common causes
- Common causes include Faulty Air Bag Crash Sensor 1, Air Bag Crash Sensor 1 harness is open or shorted, Air Bag Crash Sensor 1 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.
Code B1931 Description
What are the Possible Causes of the DTC B1931?
- Faulty Air Bag Crash Sensor 1
- Air Bag Crash Sensor 1 harness is open or shorted
- Air Bag Crash Sensor 1 circuit poor electrical connection
- Faulty Air Bag Control Module
How to Fix the DTC B1931?
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 B1931 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.
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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.
Frequently Asked Questions about B1931 Code
1. What are the common symptoms of OBDII code B1931 (Air Bag Crash Sensor 1 Feed/Return Circuit Failure)?
- The common symptoms include the airbag warning light on the dashboard staying illuminated, the airbag system being disabled, and potential issues with the airbag deployment in the event of a crash.
2. What are the possible causes of OBDII code B1931?
- The code B1931 can be caused by issues such as damaged wiring or connectors in the airbag crash sensor circuit, a faulty airbag crash sensor, or a malfunctioning airbag control module.
3. How can I diagnose OBDII code B1931?
- Diagnosing OBDII code B1931 typically involves using a scan tool to retrieve the specific fault code, inspecting the wiring and connectors in the airbag crash sensor circuit, testing the airbag crash sensor for proper functionality, and checking the airbag control module.
4. Can I continue driving my vehicle with OBDII code B1931 present?
- It is not recommended to drive the vehicle with OBDII code B1931 present, as it indicates a potential issue with the airbag system, which is crucial for occupant safety in the event of a collision.
5. How can I repair OBDII code B1931 (Air Bag Crash Sensor 1 Feed/Return Circuit Failure)?
- Repairing OBDII code B1931 involves identifying and resolving the root cause of the issue, which may include repairing or replacing damaged wiring or connectors, replacing a faulty airbag crash sensor, or addressing any issues with the airbag control module.
6. Is it safe to reset the OBDII code B1931 without addressing the underlying issue?
- It is not recommended to simply reset the OBDII code B1931 without addressing the underlying issue, as the problem may persist and compromise the functionality of the airbag system.
7. Can a DIY enthusiast repair OBDII code B1931 at home?
- While some basic diagnostic steps can be performed at home, repairing OBDII code B1931 often requires specialized tools and expertise, so it is recommended to consult a qualified mechanic or technician for proper diagnosis and repair.
8. How much does it typically cost to repair OBDII code B1931?
- The cost of repairing OBDII code B1931 can vary depending on the underlying issue, the extent of the repairs needed, and the labor rates in your area. It's advisable to obtain quotes from local repair shops for an accurate estimate.
9. Are there any safety precautions to consider when working on the airbag system related to OBDII code B1931?
- When working on the airbag system related to OBDII code B1931, it is crucial to disconnect the vehicle's battery and wait for a specified amount of time to discharge any residual energy to prevent accidental airbag deployment, which can cause injury.
10. Will repairing OBDII code B1931 require the airbag system to be recalibrated or reset?
- Depending on the repair performed, it may be necessary to recalibrate or reset the airbag system to ensure proper functionality and to clear the fault code B1931 from the vehicle's computer system.
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