B1940 Lexus Code - Short in Selectable Force Limiter Squib Right Circuit
Quick Answer
The B1940 diagnostic trouble code for Lexus vehicles indicates a short in the Selectable Force Limiter Squib Right Circuit. Common causes include Damaged wiring or connectors in the selectable force limiter squib circuit, Faulty selectable force limiter squib, 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
- B1940 Lexus indicates Short in Selectable Force Limiter Squib Right Circuit.
- Common causes
- Common causes include Damaged wiring or connectors in the selectable force limiter squib circuit, Faulty selectable force limiter squib, 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.
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Code B1940 Lexus Description
The B1940 diagnostic trouble code for Lexus vehicles indicates a short in the Selectable Force Limiter Squib Right Circuit. This code specifically refers to an issue with the circuit that controls the selectable force limiter squib on the right side of the vehicle. The selectable force limiter squib is a safety feature that is part of the vehicle's airbag system. In the event of a collision, the force limiter squib helps to control the deployment of the airbag to ensure that it inflates with the appropriate force based on the severity of the impact.
Common Causes of B1940 Lexus
- Damaged wiring or connectors in the selectable force limiter squib circuit
- Faulty selectable force limiter squib
- Malfunctioning airbag control module
- Corrosion or moisture in the electrical connections
- Impact or collision that damaged the airbag system components
Symptoms of B1940 Lexus
- Airbag warning light illuminated on the dashboard
- Inability to activate or adjust the force limiter squib
- Airbag system failure message displayed on the instrument cluster
- Intermittent or non-functioning airbag deployment in a collision
How to Fix B1940 Lexus
- Begin by conducting a thorough inspection of the selectable force limiter squib circuit, checking for any visible damage to the wiring or connectors.
- Test the selectable force limiter squib using a multimeter to determine if it is functioning properly.
- Inspect the airbag control module for any signs of damage or malfunction, and replace if necessary.
- Clear the diagnostic trouble code from the vehicle's system using a compatible scan tool.
- Perform a final test of the airbag system to ensure that the issue has been resolved and that the airbags deploy as intended in a controlled environment.
Cost to Fix B1940 Lexus
The cost of repairing a short in the Selectable Force Limiter Squib Right Circuit can vary depending on the specific cause of the issue and the extent of the damage. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost for this issue is typically between $200 and $800. It's important to note that these are rough estimates, and actual costs may vary based on factors such as the vehicle's make and model, the location of the repair shop, and any additional services or parts needed. It's recommended to consult with a qualified mechanic or repair shop for a more accurate cost estimate based on your specific situation.
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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 B1940 Lexus Code
1. What are the common symptoms of OBDII code B1940 in a Lexus related to a short in the selectable force limiter squib right circuit?
Common symptoms include the airbag warning light illuminating on the dashboard and the airbag system potentially being disabled.
2. What can cause the OBDII code B1940 in a Lexus?
This code is typically caused by a short circuit in the selectable force limiter squib right circuit, which may be due to damaged wiring or a faulty squib (airbag inflator) itself.
3. How serious is the OBDII code B1940 in a Lexus?
This code indicates a problem with the airbag system, which is a critical safety feature. It is important to address this issue promptly to ensure the airbags deploy correctly in case of an accident.
4. How can I diagnose the OBDII code B1940 in a Lexus?
Diagnosing this code usually involves inspecting the wiring and connectors in the selectable force limiter squib right circuit, as well as testing the squib itself using a multimeter or advanced diagnostic tools.
5. Can I drive my Lexus with the OBDII code B1940 present?
It is not recommended to drive the vehicle with this code active, as it indicates a potential issue with the airbag system. Driving with a faulty airbag system can compromise your safety in the event of a collision.
6. How much does it cost to repair the OBDII code B1940 in a Lexus?
The cost of repairing this code can vary depending on the exact cause of the issue. It may involve repairing or replacing damaged wiring, connectors, or the squib itself, so it is best to consult a professional for an accurate estimate.
7. Can I reset the OBDII code B1940 in a Lexus myself?
While you can clear the diagnostic trouble codes using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from recurring. Simply clearing the code without fixing the problem may lead to the issue persisting.
8. Are there any safety precautions to take when working on the selectable force limiter squib circuit in a Lexus?
When working on the airbag system, always disconnect the vehicle's battery and wait for a few minutes to ensure the system is fully depowered. Additionally, follow proper safety procedures outlined in the vehicle's service manual to prevent accidental airbag deployment.
9. How long does it take to repair the OBDII code B1940 in a Lexus?
The repair time can vary depending on the extent of the damage and the accessibility of components. It may take a few hours to a full day to diagnose and repair the issue associated with this code.
10. Can a DIY enthusiast fix the OBDII code B1940 in a Lexus?
While some DIY enthusiasts may have the skills to diagnose and repair wiring issues, working on the airbag system can be complex and dangerous. It is recommended to consult a professional mechanic or technician with experience in airbag system repairs for this particular code.
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