AutoCodes – Lexus – B1816 Lexus

B1816 Lexus Code - Open In Front Passenger Side Squib 2nd Step Circuit

Quick Answer

The Front Passenger Side Squib 2nd Step Circuit consists of the Center Airbag Sensor Assembly and the Front Passenger Airbag Assembly. Common causes include Instrument panel wire, Faulty Front Passenger Airbag Assembly (Front Passenger Side Squib 2nd Step), Front Passenger Airbag Assembly harness is open or shorted. 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: B1816 Lexus indicates Open In Front Passenger Side Squib 2nd Step Circuit.
Common causes: Common causes include Instrument panel wire, Faulty Front Passenger Airbag Assembly (Front Passenger Side Squib 2nd Step), Front Passenger Airbag Assembly harness is open or shorted.
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 4,367

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 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1816 Lexus Description

The Front Passenger Side Squib 2nd Step Circuit consists of the Center Airbag Sensor Assembly and the Front Passenger Airbag Assembly. The circuit signals the Supplemental Restraint System (SRS) to deploy when deployment conditions are met. The Diagnostic Trouble Code (DTC) is recorded when a malfunction is detected in the Front Passenger Side Squib 2nd Step Circuit.

OBDII Code B1816 Lexus - Open In Front Passenger Side Squib 2nd Step Circuit - AutoCodes.com — B1816 Lexus Code - Open In Front Passenger Side Squib 2nd Step Circuit

What does this mean?

What are the Possible Causes of the DTC B1816 Lexus?

Instrument panel wire
Faulty Front Passenger Airbag Assembly (Front Passenger Side Squib 2nd Step)
Front Passenger Airbag Assembly harness is open or shorted
Front Passenger Airbag Assembly circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1816 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 B1816 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 B1816 Lexus code?

Need more information on how to fix the B1816 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1816 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 B1816 Lexus Code

1. What are the common symptoms of OBDII code B1816 in a Lexus related to an open in the front passenger side squib 2nd step circuit?

Symptoms may include the airbag warning light illuminating on the dashboard and the airbag system possibly being disabled.

2. What can cause the OBDII code B1816 to trigger in a Lexus?

The code is typically triggered by a break or open circuit in the front passenger side squib 2nd step circuit, which can be caused by wiring issues or a faulty airbag component.

3. How serious is the OBDII code B1816 in a Lexus?

This code is related to the airbag system, so it is important to address it promptly to ensure the airbags deploy correctly in case of an accident.

4. What should I do if my Lexus shows the OBDII code B1816 for an open in the front passenger side squib 2nd step circuit?

It is recommended to have the vehicle inspected by a qualified mechanic to diagnose the exact cause of the issue and perform any necessary repairs to ensure the airbag system functions properly.

5. Can I continue driving my Lexus with the OBDII code B1816 present?

It is not advisable to continue driving the vehicle with this code active, as it indicates a potential issue with the airbag system that may compromise safety in the event of a collision.

6. How can I repair the open in the front passenger side squib 2nd step circuit in my Lexus?

Repairing this issue typically involves locating the open circuit, repairing or replacing damaged wiring, and ensuring proper connection of the airbag components in the front passenger side squib circuit.

7. Are there any DIY tips for troubleshooting the OBDII code B1816 in a Lexus?

While basic troubleshooting like checking for loose connections or visible wiring damage can be done, it is recommended to have a professional diagnose and repair the issue due to the critical nature of the airbag system.

8. Is it safe to reset the OBDII code B1816 in a Lexus without fixing the underlying issue?

Resetting the code without addressing the underlying problem can temporarily clear the warning light but will not resolve the safety issue with the airbag system. It is best to fix the problem first.

9. How much does it typically cost to repair the OBDII code B1816 in a Lexus?

The cost of repair can vary depending on the exact cause of the issue and the labor rates in your area. It is best to get a diagnostic assessment from a mechanic for an accurate estimate.

10. Can the OBDII code B1816 be related to other airbag system faults in a Lexus?

While this code specifically refers to an open in the front passenger side squib 2nd step circuit, it is possible for other airbag system faults to trigger related codes as well. A comprehensive diagnosis is recommended.