AutoCodes – Lexus – B1855 Lexus

B1855 Lexus Code - Short In Rear Side Squib Left Circuit

Quick Answer

The Rear Side Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Side Airbag Assembly Left (LH). Common causes include Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit), Rear Seat Side Airbag Assembly Left harness is open or shorted, Rear Seat Side 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: B1855 Lexus indicates Short In Rear Side Squib Left Circuit.
Common causes: Common causes include Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit), Rear Seat Side Airbag Assembly Left harness is open or shorted, Rear Seat Side 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 2,881

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 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1855 Lexus Description

The Rear Side Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Side 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 Rear Side Squib Left Circuit.

OBDII Code B1855 Lexus - Short In Rear Side Squib Left Circuit - AutoCodes.com — B1855 Lexus Code - Short In Rear Side Squib Left Circuit

What does this mean?

What are the Possible Causes of the DTC B1855 Lexus?

Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit)
Rear Seat Side Airbag Assembly Left harness is open or shorted
Rear Seat Side Airbag Assembly Left circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1855 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 B1855 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 B1855 Lexus code?

Need more information on how to fix the B1855 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1855 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 B1855 Lexus Code

1. What are the common symptoms of OBDII code B1855 in a Lexus related to a short in the rear side squib left circuit?

The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the airbag system's functionality.

2. What could cause the OBDII code B1855 in a Lexus indicating a short in the rear side squib left circuit?

Possible causes include damaged wiring, a faulty airbag squib left circuit, or a problem with the airbag control module.

3. How can I diagnose the OBDII code B1855 related to a short in the rear side squib left circuit in my Lexus?

Diagnosis involves using a diagnostic scanner to retrieve the specific fault code, inspecting the wiring for damage or shorts, and testing the airbag squib left circuit for proper functionality.

4. Is it safe to drive my Lexus with the OBDII code B1855 indicating a short in the rear side squib left circuit?

It is not recommended to drive the vehicle with this code present, as it can affect the proper operation of the airbag system in the event of a collision.

5. Can I repair the OBDII code B1855 related to a short in the rear side squib left circuit in my Lexus myself?

Repairing this issue often requires specialized knowledge and tools, so it is recommended to have the problem diagnosed and repaired by a qualified automotive technician.

6. How much does it typically cost to repair the OBDII code B1855 in a Lexus due to a short in the rear side squib left circuit?

The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing damaged wiring, repairing the airbag squib left circuit, or addressing issues with the airbag control module.

7. Are there any safety precautions I should take when working on the airbag system to resolve the OBDII code B1855 in my Lexus?

It is crucial to disconnect the vehicle's battery and wait for a specified time before working on the airbag system to prevent accidental deployment and ensure personal safety.

8. Can resetting the OBDII code B1855 related to a short in the rear side squib left circuit in my Lexus resolve the issue?

While clearing the fault code may temporarily turn off the warning light, it is essential to diagnose and address the root cause of the problem to ensure the airbag system's proper operation.

9. How long does it usually take to repair the OBDII code B1855 in a Lexus due to a short in the rear side squib left circuit?

The repair time can vary based on the complexity of the issue and the availability of parts, but it may take a few hours to a full day to complete the repair.

10. Will the OBDII code B1855 in my Lexus reset on its own after the issue with the rear side squib left circuit is fixed?

After the repair is completed and the underlying cause of the fault is resolved, the code may clear on its own after a few successful driving cycles, indicating that the issue has been fixed.