AutoCodes – Lexus – B1846 Lexus

B1846 Lexus Code - Open In Curtain Shield Squib Left 2nd Step Circuit

Quick Answer

The Curtain Shield Squib Left (LF) 2nd Step Circuit consists of the Center Airbag Sensor Assembly and the Curtain Shield Airbag Assembly Left (LH). Common causes include Faulty Curtain Shield Airbag Assembly Left (LH) (Curtain Shield Squib Left 2nd Step), Curtain Shield Airbag Assembly Left harness is open or shorted, Curtain Shield Airbag Assembly Left 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: B1846 Lexus indicates Open In Curtain Shield Squib Left 2nd Step Circuit.
Common causes: Common causes include Faulty Curtain Shield Airbag Assembly Left (LH) (Curtain Shield Squib Left 2nd Step), Curtain Shield Airbag Assembly Left harness is open or shorted, Curtain Shield Airbag Assembly Left 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 1,976

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 Jul 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1846 Lexus Description

The Curtain Shield Squib Left (LF) 2nd Step Circuit consists of the Center Airbag Sensor Assembly and the Curtain Shield Airbag Assembly Left (LH). The circuit instructs the Supplemental Restraint System (SRS) to deploy when deployment conditions are met. The Diagnostic Trouble Code (DTC) is stored when a malfunction is detected in the Curtain Shield Squib Left 2nd Step Circuit.

OBDII Code B1846 Lexus - Open In Curtain Shield Squib Left 2nd Step Circuit - AutoCodes.com — B1846 Lexus Code - Open In Curtain Shield Squib Left 2nd Step Circuit

What does this mean?

What are the Possible Causes of the DTC B1846 Lexus?

Faulty Curtain Shield Airbag Assembly Left (LH) (Curtain Shield Squib Left 2nd Step)
Curtain Shield Airbag Assembly Left harness is open or shorted
Curtain Shield Airbag Assembly Left circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1846 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 B1846 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 B1846 Lexus code?

Need more information on how to fix the B1846 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1846 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 B1846 Lexus Code

1. What are the common symptoms of OBDII code B1846 in a Lexus related to the "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- Common symptoms include the airbag warning light illuminated on the dashboard, non-deployment of the curtain airbags during an accident, and possible loss of communication with the airbag system.

2. What could cause the OBDII code B1846 in a Lexus indicating an "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- The code may be triggered by a damaged or disconnected wire in the curtain shield airbag system, a faulty squib (airbag inflator) in the left 2nd step circuit, or issues with the airbag control module.

3. How can I diagnose and repair the OBDII code B1846 in a Lexus linked to an "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- Diagnose the code using a professional OBDII scanner to pinpoint the exact cause within the curtain shield airbag system. Repair usually involves inspecting and repairing/replacing damaged wires, connectors, or components.

4. Is it safe to drive a Lexus with the OBDII code B1846 related to an "Open In Curtain Shield Squib Left 2nd Step Circuit" illuminated?

- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the curtain airbag system, which may affect occupant safety in case of an accident.

5. Can I reset or clear the OBDII code B1846 in a Lexus indicating an "Open In Curtain Shield Squib Left 2nd Step Circuit" myself?

- While you can clear the code temporarily with an OBDII scanner, it is crucial to diagnose and fix the underlying issue causing the code to prevent safety risks and ensure proper airbag functionality.

6. What are the possible risks of ignoring the OBDII code B1846 in a Lexus associated with an "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- Ignoring this code can lead to non-deployment of the curtain airbags during an accident, compromising occupant safety and potentially causing more severe injuries in a collision.

7. Are there any specific models or years of Lexus vehicles more prone to experiencing the OBDII code B1846 for the "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- This code can occur in various Lexus models equipped with curtain airbags, so it's essential to address the issue promptly regardless of the specific model or year.

8. How long does it typically take to repair the OBDII code B1846 related to an "Open In Curtain Shield Squib Left 2nd Step Circuit" in a Lexus?

- The repair time can vary depending on the extent of the damage and the exact cause of the code. It may take anywhere from a couple of hours to a full day for diagnostics and repairs.

9. Can a DIY enthusiast with automotive knowledge fix the OBDII code B1846 in a Lexus associated with an "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- While some experienced DIYers may attempt to diagnose and repair the issue themselves, it is recommended to consult a professional technician or mechanic due to the complexity and safety implications of airbag systems.

10. Is it necessary to replace the entire curtain shield airbag system in a Lexus when dealing with the OBDII code B1846 for the "Open In Curtain Shield Squib Left 2nd Step Circuit"?

- In many cases, only specific components like wires, connectors, or squibs need repair or replacement, rather than replacing the entire system. A thorough diagnosis will determine the exact course of action needed.