AutoCodes – Lexus – B1845 Lexus

B1845 Lexus Code - Short 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: B1845 Lexus indicates Short 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 845

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 B1845 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 B1845 Lexus - Short In Curtain Shield Squib Left 2nd Step Circuit - AutoCodes.com — B1845 Lexus Code - Short In Curtain Shield Squib Left 2nd Step Circuit

What does this mean?

What are the Possible Causes of the DTC B1845 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 B1845 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 B1845 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 B1845 Lexus code?

Need more information on how to fix the B1845 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1845 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 B1845 Lexus Code

1. What are the common symptoms of OBDII code B1845 in a Lexus related to a short in the curtain shield squib left 2nd step circuit?

- Common symptoms include the airbag warning light being illuminated on the dashboard and potential non-deployment of the curtain shield airbag during a collision.

2. What can cause the OBDII code B1845 to occur in a Lexus?

- The code B1845 is often triggered by a short circuit in the curtain shield squib left 2nd step circuit, which may be caused by damaged wiring, a faulty squib, or a poor connection.

3. How can I diagnose the issue related to the B1845 code in my Lexus?

- Diagnosing the issue involves checking the wiring harness for damage, inspecting the curtain shield squib for faults, and ensuring all electrical connections are secure and free of corrosion.

4. Is it safe to drive my Lexus with the OBDII code B1845 active?

- It is not recommended to drive the vehicle with the B1845 code active, as the curtain shield airbag may not deploy in the event of a collision, compromising passenger safety.

5. Can I reset the OBDII code B1845 in my Lexus without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is essential to address the root cause of the problem to ensure the airbag system functions correctly in the future.

6. How do I repair a short in the curtain shield squib left 2nd step circuit in my Lexus?

- Repairing the issue involves identifying and fixing the short circuit, replacing damaged wiring or components, and ensuring all connections are properly secured and insulated.

7. Are there any DIY tips for troubleshooting the B1845 code in a Lexus?

- DIY tips include carefully inspecting the wiring harness for visible damage, checking the curtain shield squib for continuity using a multimeter, and verifying the connections are tight.

8. Can a professional mechanic help me fix the B1845 OBDII code in my Lexus?

- Yes, a qualified mechanic can diagnose and repair the B1845 code by conducting thorough testing, replacing faulty components, and resetting the system to ensure proper functionality.

9. How much does it typically cost to repair the OBDII code B1845 in a Lexus at a repair shop?

- Repair costs can vary depending on the extent of the damage and the specific repairs needed, but expect to pay for parts, labor, and diagnostic fees, which can range from a few hundred to over a thousand dollars.

10. What are the potential risks of ignoring the OBDII code B1845 in my Lexus?

- Ignoring the B1845 code can lead to the curtain shield airbag not deploying in an accident, increasing the risk of injury to occupants and potentially compromising the vehicle's safety in a crash.