AutoCodes – Scion – B1866 Scion

B1866 Scion Code - Open In Front Passenger Side Knee Airbag Squib Circuit

Quick Answer

The Front Passenger Side Knee Airbag Squib Circuit consists of the Airbag Sensor Assembly and the Front Passenger Side Knee Airbag Assembly. Common causes include Faulty Front Passenger Side Knee Airbag Assembly (Front Passenger Side Knee Squib), Front Passenger Side Knee Airbag Assembly harness is open or shorted, Front Passenger Side Knee Airbag 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: B1866 Scion indicates Open In Front Passenger Side Knee Airbag Squib Circuit.
Common causes: Common causes include Faulty Front Passenger Side Knee Airbag Assembly (Front Passenger Side Knee Squib), Front Passenger Side Knee Airbag Assembly harness is open or shorted, Front Passenger Side Knee Airbag 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 633

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 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1866 Scion Description

The Front Passenger Side Knee Airbag Squib Circuit consists of the Airbag Sensor Assembly and the Front Passenger Side Knee Airbag Assembly. 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 Front Passenger Side Knee Airbag Squib Circuit.

OBDII Code B1866 Scion - Open In Front Passenger Side Knee Airbag Squib Circuit - AutoCodes.com — B1866 Scion Code - Open In Front Passenger Side Knee Airbag Squib Circuit

What does this mean?

What are the Possible Causes of the DTC B1866 Scion?

Faulty Front Passenger Side Knee Airbag Assembly (Front Passenger Side Knee Squib)
Front Passenger Side Knee Airbag Assembly harness is open or shorted
Front Passenger Side Knee Airbag Assembly circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1866 Scion?

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 B1866 Scion 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 B1866 Scion code?

Need more information on how to fix the B1866 Scion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1866 Scion 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 B1866 Scion Code

1. What are the common symptoms of an OBDII code B1866 in a Scion related to the "Open In Front Passenger Side Knee Airbag Squib Circuit"?

- Common symptoms include the airbag warning light illuminating on the dashboard and potential failure of the front passenger side knee airbag system.

2. What could cause the OBDII code B1866 to occur in a Scion?

- The code B1866 typically indicates an open circuit in the front passenger side knee airbag squib circuit, which could be caused by damaged wiring, a faulty squib connector, or a defective airbag module.

3. How can I diagnose the Open In Front Passenger Side Knee Airbag Squib Circuit issue in my Scion triggering the B1866 code?

- Diagnosis involves inspecting the wiring harness, connectors, and components associated with the front passenger side knee airbag system for any visible damage or loose connections. Using a multimeter to check for continuity may also be necessary.

4. Is it safe to drive my Scion with the B1866 OBDII code related to the front passenger side knee airbag circuit?

- It is not recommended to drive the vehicle with an unresolved airbag system issue as it may compromise passenger safety in the event of a collision. Have the issue diagnosed and repaired promptly.

5. Can I reset the B1866 OBDII code related to the front passenger side knee airbag circuit in my Scion using a code reader?

- While you can clear the code temporarily with an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent future safety risks. Clearing the code without fixing the problem will likely result in the code reappearing.

6. What are the repair options for resolving the B1866 OBDII code in a Scion with an open front passenger side knee airbag squib circuit?

- Repair options may include repairing or replacing damaged wiring, fixing faulty connectors, or replacing the front passenger side knee airbag squib or module if necessary. Consulting a professional technician for an accurate diagnosis is recommended.

7. How much does it cost to repair the Open In Front Passenger Side Knee Airbag Squib Circuit problem causing the B1866 code in a Scion?

- Repair costs can vary depending on the extent of the damage and the specific components that need replacement. It is advisable to get a diagnosis from a qualified technician to determine the exact repair cost.

8. Can I fix the OBDII code B1866 issue related to the front passenger side knee airbag circuit in my Scion myself?

- While some experienced DIYers may be able to address wiring issues or connector problems, dealing with airbag systems requires specialized knowledge and precautions due to safety concerns. It is recommended to seek professional help for airbag system repairs.

9. Will fixing the B1866 OBDII code in my Scion related to the open front passenger side knee airbag squib circuit affect the vehicle's warranty?

- Repairs related to safety systems like airbags are typically covered by the vehicle's warranty. Ensure that the repairs are performed by authorized professionals to maintain warranty coverage.

10. How often should I have the airbag system in my Scion checked to prevent issues like the B1866 code related to the front passenger side knee airbag squib circuit?

- It is recommended to have the airbag system inspected during regular maintenance visits or if you notice any warning lights indicating a problem. Prompt attention to airbag system issues can help prevent potential safety hazards.