AutoCodes – Generic – B1901

B1901 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 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 28,848

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

What does this mean?

What are the Possible Causes of the DTC B1901?

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?

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 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 code?

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

Need Help with the Code?

Get the B1901 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1901 Lexus — Open in Front Pretensioner Squib Right Circuit
B1901 Scion — Open in Front Pretensioner Squib Right Circuit
B1901 Toyota — Open in Front Pretensioner Squib Right 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 B1901 Code

1. What does the OBDII code B1901 mean?

The code B1901 indicates an "Open in Front Pretensioner Squib Right Circuit" in the vehicle's airbag system.

2. What are the common symptoms of OBDII code B1901?

Common symptoms of B1901 may include the airbag warning light staying illuminated on the dashboard and potential issues with the right front seatbelt pretensioner.

3. What are the possible causes of OBDII code B1901?

Possible causes of B1901 include a faulty right front pretensioner squib, damaged wiring in the circuit, a poor electrical connection, or a blown fuse related to the airbag system.

4. How can I diagnose the OBDII code B1901?

Diagnosing B1901 involves using a diagnostic scanner to retrieve the trouble code, inspecting the right front pretensioner squib and its wiring for damage, and checking the connections and fuses related to the airbag system.

5. Can I drive my vehicle with the OBDII code B1901 active?

It is not recommended to drive the vehicle with an active B1901 code, as it indicates a potential issue with the airbag system that may compromise your safety in the event of a collision.

6. How can I repair OBDII code B1901?

Repairing B1901 typically involves replacing the faulty right front pretensioner squib, repairing any damaged wiring in the circuit, ensuring proper electrical connections, and resetting the trouble code with a diagnostic scanner.

7. Is it safe to reset the OBDII code B1901 without fixing the issue?

Resetting the B1901 code without addressing the underlying problem in the airbag system is not recommended, as it may lead to continued safety risks and potential legal implications.

8. Can a DIY enthusiast fix the OBDII code B1901 at home?

While some DIY enthusiasts may have the skills to diagnose and repair B1901, working on the airbag system can be complex and dangerous. It is advisable to seek professional assistance to ensure the issue is resolved correctly and safely.

9. How much does it cost to repair OBDII code B1901 at a mechanic?

The cost of repairing B1901 can vary depending on the specific cause of the issue, the labor rates of the mechanic, and the cost of any replacement parts needed. It is recommended to obtain quotes from different mechanics for an accurate estimate.

10. How often does OBDII code B1901 occur in vehicles?

The occurrence of B1901 can vary among different vehicle models and manufacturers. It is not one of the most common OBDII codes but may still be encountered in vehicles with airbag system issues.