AutoCodes – Lexus – B1940 Lexus

B1940 Lexus Code - Short in Selectable Force Limiter Squib Right Circuit

Quick Answer

The Selectable Force Limiter Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and Front Seat Outer Belt Assembly Right (RH). Common causes include Faulty Front Seat Outer Belt Assembly Right (RH) (Selectable Force Limiter Squib Right), Front Seat Outer Belt Assembly Right harness is open or shorted, Front Seat Outer Belt Assembly Right 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: B1940 Lexus indicates Short in Selectable Force Limiter Squib Right Circuit.
Common causes: Common causes include Faulty Front Seat Outer Belt Assembly Right (RH) (Selectable Force Limiter Squib Right), Front Seat Outer Belt Assembly Right harness is open or shorted, Front Seat Outer Belt Assembly Right 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 398

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 07, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1940 Lexus Description

The Selectable Force Limiter Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and Front Seat Outer Belt Assembly Right (RH). This circuit instructs the Supplemental Restraint System (SRS) to deploy when the deployment conditions are met. The Diagnostic Trouble Code (DTC) is recorded when a malfunction is detected in the Selectable Force Limiter Squib Right Circuit.

OBDII Code B1940 Lexus - Short in Selectable Force Limiter Squib Right Circuit - AutoCodes.com — B1940 Lexus Code - Short in Selectable Force Limiter Squib Right Circuit

What does this mean?

What are the Possible Causes of the DTC B1940 Lexus?

Faulty Front Seat Outer Belt Assembly Right (RH) (Selectable Force Limiter Squib Right)
Front Seat Outer Belt Assembly Right harness is open or shorted
Front Seat Outer Belt Assembly Right circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1940 Lexus?

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 B1940 Lexus 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 B1940 Lexus code?

Need more information on how to fix the B1940 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1940 Lexus 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 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.