AutoCodes – Lexus – B1901 Lexus

B1901 Lexus Code - Open in Front Pretensioner Squib Right Circuit

Quick Answer

The Front Pretensioner Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and Front Seat Outer Belt Assembly Right (RH). Common causes include Faulty Front Seat Outer Belt Assembly Right (RH) (Front Pretensioner Squib Right), Front Seat Outer Belt Assembly Right harness is open or shorted, Front Seat Outer Belt Assembly Right 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: B1901 Lexus indicates Open in Front Pretensioner Squib Right Circuit.
Common causes: Common causes include Faulty Front Seat Outer Belt Assembly Right (RH) (Front Pretensioner Squib Right), Front Seat Outer Belt Assembly Right harness is open or shorted, Front Seat Outer Belt Assembly Right 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 6,868

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 Dec 03, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1901 Lexus Description

The Front Pretensioner Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and Front Seat Outer Belt Assembly Right (RH). This circuit instructs the Supplemental Restraint System (SRS) to deploy when the deployment conditions are met. The Diagnostic Trouble Code (DTC) is recorded when a malfunction is detected in the Front Pretensioner Squib Right Circuit.

OBDII Code B1901 Lexus - Open in Front Pretensioner Squib Right Circuit - AutoCodes.com — B1901 Lexus Code - Open in Front Pretensioner Squib Right Circuit

What does this mean?

What are the Possible Causes of the DTC B1901 Lexus?

Faulty Front Seat Outer Belt Assembly Right (RH) (Front Pretensioner Squib Right)
Front Seat Outer Belt Assembly Right harness is open or shorted
Front Seat Outer Belt Assembly Right circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1901 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 B1901 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 B1901 Lexus code?

Need more information on how to fix the B1901 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1901 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 B1901 Lexus Code

1. What are the common symptoms of OBDII code B1901 in a Lexus related to the "Open in Front Pretensioner Squib Right Circuit"?

- Common symptoms may include the airbag warning light illuminating on the dashboard and a potential non-deployment of the right front airbag during a collision.

2. What can cause the OBDII code B1901 in a Lexus indicating an "Open in Front Pretensioner Squib Right Circuit"?

- Causes can vary but may include a faulty pretensioner squib right circuit, damaged wiring, loose connections, or a malfunctioning airbag control module.

3. How serious is the OBDII code B1901 in a Lexus related to an "Open in Front Pretensioner Squib Right Circuit"?

- This code is serious as it indicates a potential issue with the right front airbag system, which may affect its proper deployment in the event of a collision.

4. Can I continue driving my Lexus with the OBDII code B1901 indicating an "Open in Front Pretensioner Squib Right Circuit"?

- It is not recommended to drive the vehicle with this code present, as it may compromise the effectiveness of the right front airbag in protecting occupants during a crash.

5. How can I diagnose and repair the OBDII code B1901 in my Lexus for the "Open in Front Pretensioner Squib Right Circuit"?

- Diagnosis typically involves inspecting the wiring and connections associated with the right front pretensioner squib circuit, checking for damage or loose connections. Repair may involve fixing the wiring, replacing the pretensioner squib, or addressing issues with the airbag control module.

6. Is it safe to reset the OBDII code B1901 in my Lexus without addressing the underlying issue of an "Open in Front Pretensioner Squib Right Circuit"?

- It is not safe to simply reset the code without fixing the problem, as it may lead to a potential safety hazard by preventing the proper functioning of the right front airbag in a crash.

7. Can a DIY enthusiast repair the OBDII code B1901 in a Lexus for the "Open in Front Pretensioner Squib Right Circuit"?

- Repairing this code may require specialized tools and knowledge of airbag systems. It is recommended to seek assistance from a qualified mechanic or technician to ensure proper diagnosis and repair.

8. How much does it typically cost to fix the OBDII code B1901 in a Lexus indicating an "Open in Front Pretensioner Squib Right Circuit"?

- The cost can vary depending on the exact cause of the issue and the necessary repairs. It is advisable to consult with a professional for an accurate assessment of the repair costs.

9. Will fixing the OBDII code B1901 in my Lexus for the "Open in Front Pretensioner Squib Right Circuit" affect the vehicle's overall safety?

- Addressing this code promptly and correctly will help ensure the proper functioning of the right front airbag system, enhancing the safety of occupants in the event of a collision.

10. How can I prevent the OBDII code B1901 in my Lexus related to an "Open in Front Pretensioner Squib Right Circuit" from recurring in the future?

- Regular maintenance checks, avoiding physical damage to wiring, and ensuring proper installation of any related components can help prevent the reoccurrence of this code.