AutoCodes – Lexus – B1166 Lexus

B1166 Lexus Code - Open In Curtain Shield Squib LH Circuit

Quick Answer

The Curtain Shield Squib (Left Side) circuit consists of the Airbag Sensor Assembly Center and the Curtain Shield Squib Assembly LH. Common causes include Faulty Curtain Shield Squib Assembly (Left Side), Curtain Shield Squib Assembly harness is open or shorted, Curtain Shield Squib Assembly 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: B1166 Lexus indicates Open In Curtain Shield Squib LH Circuit.
Common causes: Common causes include Faulty Curtain Shield Squib Assembly (Left Side), Curtain Shield Squib Assembly harness is open or shorted, Curtain Shield Squib Assembly 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 3,599

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 B1166 Lexus Description

The Curtain Shield Squib (Left Side) circuit consists of the Airbag Sensor Assembly Center and the Curtain Shield Squib Assembly LH. The circuit instructs the Supplemental Restraint System (SRS) to deploy when deployment conditions are met. The Diagnostic Trouble Code (DTC) B1166 is recorded when an open circuit is detected in the Curtain Shield Squib LH circuit.

OBDII Code B1166 Lexus - Open In Curtain Shield Squib LH Circuit - AutoCodes.com — B1166 Lexus Code - Open In Curtain Shield Squib LH Circuit

What does this mean?

What are the Possible Causes of the DTC B1166 Lexus?

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

How to Fix the DTC B1166 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 B1166 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 B1166 Lexus code?

Need more information on how to fix the B1166 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1166 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 B1166 Lexus Code

1. What are the common symptoms of OBDII code B1166 in a Lexus related to an open in the curtain shield squib LH circuit?

- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential non-deployment of the curtain airbag in case of a collision.

2. What are the possible causes of OBDII code B1166 in a Lexus indicating an open in the curtain shield squib LH circuit?

- The code may be triggered by a faulty curtain shield squib LH (left-hand) or issues such as damaged wiring, loose connections, or a blown fuse.

3. How can I diagnose the root cause of OBDII code B1166 in my Lexus signaling an open in the curtain shield squib LH circuit?

- Diagnosis typically involves inspecting the curtain shield squib LH, checking the wiring harness for damage, verifying connections, and testing relevant fuses for continuity.

4. Is it safe to drive my Lexus with OBDII code B1166 related to an open in the curtain shield squib LH circuit?

- It is not recommended to drive the vehicle with this code active as it may affect the proper functioning of the curtain airbag system.

5. Can I reset the OBDII code B1166 in my Lexus myself after repairing the open in the curtain shield squib LH circuit issue?

- Yes, you can reset the code using an OBDII scanner or by disconnecting the car battery for a few minutes to clear the error code from the system.

6. Are there any repair tips for fixing OBDII code B1166 in a Lexus attributed to an open in the curtain shield squib LH circuit?

- Repair tips include checking and repairing any damaged wiring, ensuring all connections are secure, and replacing the curtain shield squib LH if necessary.

7. How much does it typically cost to repair OBDII code B1166 in a Lexus caused by an open in the curtain shield squib LH circuit?

- The cost can vary depending on the specific issue, but it may involve expenses for parts such as the curtain shield squib LH and labor costs for diagnosis and repair.

8. Can a DIY enthusiast with some automotive experience fix OBDII code B1166 in a Lexus linked to an open in the curtain shield squib LH circuit?

- While some steps like checking connections and fuses can be done by DIYers, diagnosing and repairing the curtain shield squib LH itself may require professional expertise.

9. Will OBDII code B1166 in a Lexus related to an open in the curtain shield squib LH circuit affect the overall safety of the vehicle?

- Yes, this issue can impact the safety of the vehicle as it may lead to the curtain airbag not deploying correctly in the event of a collision.

10. How urgent is it to address OBDII code B1166 in a Lexus due to an open in the curtain shield squib LH circuit?

- It is crucial to address this issue promptly to ensure the proper functioning of the curtain airbag system and maintain the safety of the vehicle occupants.