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B1845 Lexus Code - Short In Curtain Shield Squib Left 2nd Step Circuit

Quick Answer

The diagnostic code B1845 for Lexus vehicles indicates a "Short In Curtain Shield Squib Left 2nd Step Circuit." This code specifically refers to an issue with the curtain shield airbag system on the left side of the vehicle. Common causes include Wiring or connector damage in the curtain shield squib circuit, Faulty curtain shield squib component, Water or moisture intrusion in the airbag system. 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 Wiring or connector damage in the curtain shield squib circuit, Faulty curtain shield squib component, Water or moisture intrusion in the airbag system.
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 10, 2024
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Code B1845 Lexus Description

The diagnostic code B1845 for Lexus vehicles indicates a "Short In Curtain Shield Squib Left 2nd Step Circuit." This code specifically refers to an issue with the curtain shield airbag system on the left side of the vehicle. The curtain shield airbags are an important safety feature that deploy in the event of a side impact or rollover to protect occupants from head injuries.

OBDII Code B1845 Lexus - Short In Curtain Shield Squib Left 2nd Step Circuit
B1845 Lexus Code - Short In Curtain Shield Squib Left 2nd Step Circuit

Common Causes of B1845 Lexus

  1. Wiring or connector damage in the curtain shield squib circuit
  2. Faulty curtain shield squib component
  3. Water or moisture intrusion in the airbag system
  4. Electrical issues in the vehicle's wiring harness
  5. Impact damage to the vehicle that affects the airbag system

Symptoms of B1845 Lexus

  1. Airbag warning light illuminated on the dashboard
  2. Inability to turn off the airbag warning light
  3. Failed airbag system self-test during vehicle startup
  4. Possible non-deployment of curtain shield airbag in a collision

How to Fix B1845 Lexus

  1. Diagnose the specific cause of the short circuit in the curtain shield squib circuit using a diagnostic scanner and multimeter
  2. Inspect the wiring harness, connectors, and components of the curtain shield squib for damage or corrosion
  3. Repair or replace any damaged wiring, connectors, or components as necessary
  4. Clear the diagnostic trouble codes from the vehicle's system and perform a test to ensure the issue has been resolved
  5. Perform a system reset to ensure the airbag system is functioning properly

Cost to Fix B1845 Lexus

The cost of repairing a short in the curtain shield squib left 2nd step circuit can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the parts for this repair can range from $200 to $500, while the labor costs can range from $150 to $300. Overall, the total repair cost for this issue may fall between $350 and $800. It is important to keep in mind that these are rough estimates, and actual costs may vary based on the factors mentioned earlier. Be sure to consult with a qualified mechanic or repair shop for a more accurate estimate.

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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.

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