AutoCodes – Generic – B1940

B1940 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 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 2,220

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

What does this mean?

What are the Possible Causes of the DTC B1940?

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?

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 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 code?

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

Need Help with the Code?

Get the B1940 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1940 Jaguar — Driver Seat Position Out Of Range
B1940 Lexus — Short in Selectable Force Limiter Squib Right Circuit
B1940 Scion — Short in Selectable Force Limiter Squib Right Circuit
B1940 Toyota — Short in Selectable Force Limiter Squib Right Circuit

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 Code

1. What are the common symptoms of OBDII code B1940 (Short in Selectable Force Limiter Squib Right Circuit)?

- Common symptoms include an illuminated airbag warning light on the dashboard, inoperative seatbelt pretensioners, and a potential loss of airbag deployment functionality.

2. What are the possible causes of OBDII code B1940?

- The code B1940 can be caused by a short circuit in the selectable force limiter squib right circuit, faulty wiring connections, or a malfunctioning seatbelt pretensioner.

3. How serious is OBDII code B1940?

- OBDII code B1940 is a serious issue as it affects the functionality of critical safety components like the airbags and seatbelt pretensioners. It is important to address this issue promptly to ensure the proper operation of these safety systems.

4. Can I continue driving with OBDII code B1940 present?

- It is not recommended to continue driving with OBDII code B1940 present, as it compromises the effectiveness of the airbag system and seatbelt pretensioners, which are crucial safety features in the event of a collision.

5. How can OBDII code B1940 be diagnosed?

- Diagnosis of OBDII code B1940 typically involves using a diagnostic scanner to retrieve the fault code, followed by a thorough inspection of the airbag system, wiring, and connectors to identify the source of the short circuit.

6. What are some repair tips for addressing OBDII code B1940?

- Repair tips may include checking and repairing any damaged wiring or connectors in the selectable force limiter squib right circuit, replacing the faulty seatbelt pretensioner if necessary, and clearing the fault code from the vehicle's ECU.

7. Is it possible to reset OBDII code B1940 without fixing the underlying issue?

- While it is possible to clear the fault code temporarily, it is not recommended to reset OBDII code B1940 without addressing the underlying issue, as it could compromise the safety of the vehicle's occupants in the event of an accident.

8. How much does it typically cost to repair OBDII code B1940?

- The cost of repairing OBDII code B1940 can vary depending on the extent of the damage and the specific components that need to be replaced. It is advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.

9. Are there any recalls or service bulletins related to OBDII code B1940?

- It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or service bulletins related to OBDII code B1940, as they may provide valuable information or potential solutions for addressing the issue.

10. Can OBDII code B1940 be fixed without professional help?

- While some basic troubleshooting steps can be taken, fixing OBDII code B1940 often requires specialized knowledge and tools. It is recommended to seek the assistance of a qualified mechanic or automotive technician for proper diagnosis and repair.