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

Quick Answer

The B1940 code for Toyota vehicles indicates a short in the selectable force limiter squib right circuit. Common causes include Short circuit in the selectable force limiter squib right circuit, Faulty wiring or connectors in the circuit, Damage to the selectable force limiter squib component. 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 Toyota indicates Short in Selectable Force Limiter Squib Right Circuit.
Common causes
Common causes include Short circuit in the selectable force limiter squib right circuit, Faulty wiring or connectors in the circuit, Damage to the selectable force limiter squib component.
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 B1940 Toyota Description

The B1940 code for Toyota vehicles indicates a short in the selectable force limiter squib right circuit. The selectable force limiter squib is a component of the vehicle's supplemental restraint system (SRS), also known as the airbag system. The purpose of the force limiter squib is to control the amount of force applied to the seatbelt during a collision, helping to reduce the risk of injury to the occupant.

OBDII Code B1940 Toyota - Short in Selectable Force Limiter Squib Right Circuit
B1940 Toyota Code - Short in Selectable Force Limiter Squib Right Circuit

Common Causes of B1940 Toyota

  1. Short circuit in the selectable force limiter squib right circuit
  2. Faulty wiring or connectors in the circuit
  3. Damage to the selectable force limiter squib component
  4. Corrosion or moisture in the circuit
  5. Electrical issues in the SRS system

Symptoms of B1940 Toyota

  1. Illuminated airbag warning light on the dashboard
  2. Inoperative or malfunctioning airbag system
  3. Increased risk of injury in the event of a collision
  4. Diagnostic trouble code B1940 stored in the vehicle's computer system

How to Fix B1940 Toyota

  1. Begin by diagnosing the specific cause of the short circuit in the selectable force limiter squib right circuit using a diagnostic scanner.
  2. Inspect the wiring, connectors, and components in the circuit for any signs of damage or corrosion.
  3. Repair or replace any damaged wiring, connectors, or components as needed.
  4. Clear the diagnostic trouble code from the vehicle's computer system and test the airbag system to ensure proper functionality.
  5. If the issue persists, further troubleshooting may be required to identify and address any underlying electrical issues in the SRS system.

Cost to Fix B1940 Toyota

The typical repair costs for addressing a short in the selectable force limiter squib right circuit can vary depending on the extent of the damage and the specific components that need to be repaired or replaced. In general, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $400. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the specific diagnosis time and labor rates at auto repair shops. It's recommended to consult with a qualified mechanic or repair shop for a more accurate cost estimate.

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Information for Specific Toyota Models

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 Toyota Code

What does the OBDII code B1940 mean on a Toyota?

The code B1940 indicates a short circuit in the Selectable Force Limiter Squib Right Circuit, which is part of the passenger-side seatbelt pretensioner system.

What are the common symptoms of code B1940 in a Toyota?

Common symptoms include the airbag warning light illuminating on the dashboard and potential deactivation of the airbag or seatbelt pretensioner system.

What causes the B1940 code to appear in a Toyota?

The code is typically caused by a short circuit in the wiring, a damaged connector, or a fault in the seatbelt pretensioner assembly.

Can I drive my Toyota with a B1940 code?

While the vehicle may still be drivable, the airbag system and seatbelt pretensioner may not function properly in an accident, posing a safety risk.

How do I diagnose the B1940 code in a Toyota?

Diagnosis involves inspecting the wiring and connectors for damage or shorts, checking the seatbelt pretensioner, and using a scan tool to confirm the fault.

What tools are needed to fix the B1940 code?

You may need a diagnostic scan tool, multimeter, and basic automotive tools to inspect and repair wiring or connectors.

How much does it cost to repair a B1940 code on a Toyota?

Repair costs can range from $50 to $500 depending on whether the issue is a simple wiring repair or requires replacing the seatbelt pretensioner assembly.

Can I fix the B1940 code myself on a Toyota?

If you're experienced with automotive electrical systems, you may be able to inspect and repair the wiring or connectors. Otherwise, it's best left to a professional.

Does clearing the B1940 code fix the problem?

Clearing the code will turn off the warning light temporarily, but the underlying issue must be repaired to prevent the code from returning.

What happens if the B1940 code is ignored?

Ignoring the code can result in a non-functional seatbelt pretensioner or airbag system, reducing occupant safety in the event of a collision.

Discuss the causes and fixes for B1940 Toyota OBDII Code

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