AutoCodes – Lexus – B1140 Lexus

B1140 Lexus Code - Side Airbag Sensor Assembly Malfunction

Quick Answer

The Side Airbag Sensor Assembly (Right Side) consists of the safing sensor, diagnosis circuit, and lateral deceleration sensor, etc. Common causes include Faulty Side Airbag Sensor Assembly (Right Side), Side Airbag Sensor Assembly (Right Side) harness is open or shorted, Side Airbag Sensor Assembly (Right Side) 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: B1140 Lexus indicates Side Airbag Sensor Assembly Malfunction.
Common causes: Common causes include Faulty Side Airbag Sensor Assembly (Right Side), Side Airbag Sensor Assembly (Right Side) harness is open or shorted, Side Airbag Sensor Assembly (Right Side) 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 7,499

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 Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1140 Lexus Description

The Side Airbag Sensor Assembly (Right Side) consists of the safing sensor, diagnosis circuit, and lateral deceleration sensor, etc. It receives signals from the lateral deceleration sensor, judges whether or not the SRS must be activated, and detects a diagnosis system malfunction. DTC B1140 is recorded when the occurrence of a malfunction in the Side Airbag Sensor Assembly (Right Side) is detected.

OBDII Code B1140 Lexus - Side Airbag Sensor Assembly Malfunction - AutoCodes.com — B1140 Lexus Code - Side Airbag Sensor Assembly Malfunction

What does this mean?

What are the Possible Causes of the DTC B1140 Lexus?

Faulty Side Airbag Sensor Assembly (Right Side)
Side Airbag Sensor Assembly (Right Side) harness is open or shorted
Side Airbag Sensor Assembly (Right Side) circuit poor electrical connection
Faulty Airbag Sensor Assembly Center

How to Fix the DTC B1140 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 B1140 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 B1140 Lexus code?

Need more information on how to fix the B1140 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1140 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 B1140 Lexus Code

1. What are the common symptoms of OBDII code B1140 in a Lexus related to the Side Airbag Sensor Assembly Malfunction?

The common symptoms include the airbag warning light staying illuminated on the dashboard and a potential failure of the side airbag system in case of a collision.

2. What are some possible causes of the B1140 code indicating a Side Airbag Sensor Assembly Malfunction in a Lexus?

Possible causes include a faulty side airbag sensor assembly, damaged wiring or connectors in the airbag system, or issues with the airbag control module.

3. How serious is the B1140 OBDII code related to the Side Airbag Sensor Assembly Malfunction in a Lexus?

This code indicates a malfunction in the side airbag system, which can compromise the safety of occupants in case of a side collision. It is crucial to address this issue promptly.

4. Can I continue driving my Lexus with the B1140 code showing a Side Airbag Sensor Assembly Malfunction?

It is not recommended to drive the vehicle with the B1140 code present, as the side airbag system may not deploy properly in case of an accident, increasing the risk of injury to occupants.

5. How can I diagnose and repair the B1140 code related to the Side Airbag Sensor Assembly Malfunction in my Lexus?

Diagnosis typically involves using an OBDII scanner to retrieve the code and then inspecting the side airbag sensor assembly, wiring, and connectors for any issues. Repair may involve replacing faulty components or addressing wiring problems.

6. Can I reset the B1140 OBDII code indicating a Side Airbag Sensor Assembly Malfunction in my Lexus on my own?

While you can clear the code with an OBDII scanner, it is crucial to diagnose the underlying issue causing the code first. Simply resetting the code without addressing the problem will not fix the malfunction.

7. Are there any common mistakes to avoid when dealing with the B1140 code related to the Side Airbag Sensor Assembly Malfunction in a Lexus?

One common mistake is ignoring the code or attempting to clear it without investigating the root cause. It is important to address the malfunction properly to ensure the airbag system's reliability.

8. How much does it typically cost to repair the B1140 code indicating a Side Airbag Sensor Assembly Malfunction in a Lexus?

The cost of repair can vary depending on the specific issue causing the code and the labor rates of the repair shop. It is advisable to get a diagnosis and repair estimate from a qualified technician.

9. Can a DIY enthusiast fix the B1140 OBDII code related to the Side Airbag Sensor Assembly Malfunction in a Lexus?

While some DIY enthusiasts may have the skills to diagnose and repair simple issues, working on the airbag system can be complex and dangerous. It is recommended to seek professional help for this type of repair.

10. How can I prevent the recurrence of the B1140 code indicating a Side Airbag Sensor Assembly Malfunction in my Lexus?

Regular maintenance and inspections of the airbag system, including checking for loose connections and damaged wiring, can help prevent the recurrence of the B1140 code.