AutoCodes – Generic – B1166

B1166 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 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 10,858

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

What does this mean?

What are the Possible Causes of the DTC B1166?

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?

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 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 code?

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

Need Help with the Code?

Get the B1166 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1166 Lexus — Open In Curtain Shield Squib LH Circuit
B1166 Scion — Open In Curtain Shield Squib LH Circuit
B1166 Toyota — Open In Curtain Shield Squib LH Circuit

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 Code

1. What are the common symptoms of OBDII code B1166 (Open In Curtain Shield Squib LH Circuit)?

The common symptoms of OBDII code B1166 include the airbag warning light illuminating on the dashboard and potential non-deployment of the curtain shield airbag in the event of a collision.

2. What are the possible causes of OBDII code B1166?

The possible causes of OBDII code B1166 include a faulty curtain shield airbag squib LH, damaged wiring in the curtain shield airbag circuit, or a poor electrical connection in the circuit.

3. How can I diagnose the issue causing OBDII code B1166?

Diagnosing OBDII code B1166 involves using a scan tool to retrieve the code, inspecting the curtain shield airbag LH circuit for damage or loose connections, and testing the curtain shield airbag squib LH for proper functionality.

4. Can I drive my vehicle with OBDII code B1166?

It is not recommended to drive your vehicle with OBDII code B1166 unresolved, as it indicates a potential issue with the curtain shield airbag system that may affect its deployment in an accident.

5. How can I repair OBDII code B1166?

To repair OBDII code B1166, you may need to replace the faulty curtain shield airbag squib LH, repair any damaged wiring in the circuit, or ensure proper electrical connections in the system.

6. Are there any safety concerns associated with OBDII code B1166?

Yes, OBDII code B1166 indicates a safety concern related to the curtain shield airbag system, which may lead to the non-deployment of the airbag in the event of a collision.

7. Can OBDII code B1166 be triggered by a loose or disconnected connector?

Yes, OBDII code B1166 can be triggered by a loose or disconnected connector in the curtain shield airbag LH circuit, leading to an open circuit and the activation of the diagnostic trouble code.

8. Is OBDII code B1166 a common issue in certain vehicle makes and models?

OBDII code B1166 may be a common issue in specific vehicle makes and models that are equipped with curtain shield airbags, as the circuit and components involved can be prone to wear and damage over time.

9. What should I do if OBDII code B1166 keeps returning after repairs?

If OBDII code B1166 keeps returning after repairs, it is recommended to recheck the curtain shield airbag LH circuit for any overlooked issues, ensure proper repairs were made, and consider seeking professional assistance for further diagnosis.

10. Can OBDII code B1166 affect the overall safety of my vehicle?

Yes, OBDII code B1166 can impact the overall safety of your vehicle by compromising the functionality of the curtain shield airbag system, which is designed to provide additional protection in the event of a side impact collision.