AutoCodes – Lexus – B1928 Lexus

B1928 Lexus Code - Short To Positive In Rear Pretensioner Squib LH Circuit

Quick Answer

The Rear Pretensioner Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Seat Outer Belt Assembly Left (LH). Common causes include Faulty Seat Outer Belt Assembly Left (LH) (Rear Pretensioner Squib LH), Seat Outer Belt Assembly Left (LH) harness is open or shorted, Seat Outer Belt Assembly Left (LH) 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: B1928 Lexus indicates Short To Positive In Rear Pretensioner Squib LH Circuit.
Common causes: Common causes include Faulty Seat Outer Belt Assembly Left (LH) (Rear Pretensioner Squib LH), Seat Outer Belt Assembly Left (LH) harness is open or shorted, Seat Outer Belt Assembly Left (LH) 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 706

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 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1928 Lexus Description

The Rear Pretensioner Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Seat Outer Belt Assembly Left (LH). This 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 Rear Pretensioner Squib LH Circuit.

OBDII Code B1928 Lexus - Short To Positive In Rear Pretensioner Squib LH Circuit - AutoCodes.com — B1928 Lexus Code - Short To Positive In Rear Pretensioner Squib LH Circuit

What does this mean?

What are the Possible Causes of the DTC B1928 Lexus?

Faulty Seat Outer Belt Assembly Left (LH) (Rear Pretensioner Squib LH)
Seat Outer Belt Assembly Left (LH) harness is open or shorted
Seat Outer Belt Assembly Left (LH) circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1928 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 B1928 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 B1928 Lexus code?

Need more information on how to fix the B1928 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1928 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 B1928 Lexus Code

1. What are the common symptoms of OBDII code B1928 in a Lexus?

The common symptoms of OBDII code B1928 in a Lexus include the airbag warning light illuminating on the dashboard and possible non-deployment of the seat belt pretensioner in the event of a collision.

2. What does the OBDII code B1928 "Short To Positive In Rear Pretensioner Squib LH Circuit" mean for a Lexus?

This code indicates a detected short circuit to the positive side in the left-hand rear pretensioner squib circuit of the seat belt system in a Lexus vehicle.

3. What are the possible causes of OBDII code B1928 in a Lexus?

Possible causes of OBDII code B1928 in a Lexus include damaged wiring, a faulty seat belt pretensioner squib, poor electrical connections, or a malfunctioning airbag control module.

4. How can I diagnose the OBDII code B1928 in my Lexus?

Diagnosing OBDII code B1928 in a Lexus involves performing a thorough inspection of the seat belt pretensioner system, checking the wiring and connections for damage, and using a scan tool to retrieve and clear the fault codes.

5. Can I repair OBDII code B1928 in my Lexus on my own?

Repairing OBDII code B1928 in a Lexus may require specialized knowledge and tools, so it is recommended to consult a professional mechanic or dealership to accurately diagnose and fix the issue.

6. Is it safe to drive my Lexus with OBDII code B1928 present?

If OBDII code B1928 is triggered, it is advisable to address the issue promptly to ensure the proper functioning of the seat belt pretensioner system in the event of an accident. Driving with this fault unresolved may compromise safety.

7. How much does it typically cost to repair OBDII code B1928 in a Lexus?

The cost of repairing OBDII code B1928 in a Lexus can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It is best to obtain a quote from a mechanic or dealership.

8. Can resetting the OBDII code B1928 in my Lexus make the issue go away?

Resetting the OBDII code B1928 in a Lexus may temporarily turn off the warning light, but it will not fix the underlying problem causing the fault code. It is essential to address the root cause of the issue for a permanent solution.

9. How critical is it to fix OBDII code B1928 in a Lexus promptly?

It is crucial to address OBDII code B1928 in a Lexus promptly to ensure the proper functioning of the seat belt pretensioner system, which plays a vital role in vehicle occupant safety during a collision.

10. Can OBDII code B1928 in a Lexus affect other vehicle systems?

OBDII code B1928 specifically relates to the seat belt pretensioner system in a Lexus, but unresolved electrical issues in this system could potentially impact other safety systems or trigger additional fault codes.