AutoCodes – Toyota – B1857 Toyota

B1857 Toyota Code - Short To Ground In Rear Side Squib Left Circuit

Quick Answer

The Rear Side Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Side Airbag Assembly Left (LH). Common causes include Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit), Rear Seat Side Airbag Assembly Left harness is open or shorted, Rear Seat Side Airbag Assembly Left 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: B1857 Toyota indicates Short To Ground In Rear Side Squib Left Circuit.
Common causes: Common causes include Faulty Rear Seat Side Airbag Assembly Left (LH) (Rear Side Squib Left Circuit), Rear Seat Side Airbag Assembly Left harness is open or shorted, Rear Seat Side Airbag Assembly Left 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 2,138

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 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1857 Toyota Description

The Rear Side Squib Left (LH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Side Airbag Assembly Left (LH). 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 Rear Side Squib Left Circuit.

OBDII Code B1857 Toyota - Short To Ground In Rear Side Squib Left Circuit - AutoCodes.com — B1857 Toyota Code - Short To Ground In Rear Side Squib Left Circuit

What does this mean?

What are the Possible Causes of the DTC B1857 Toyota?

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

How to Fix the DTC B1857 Toyota?

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 B1857 Toyota 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 B1857 Toyota code?

Need more information on how to fix the B1857 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1857 Toyota 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 B1857 Toyota Code

1. What are the common symptoms of OBDII code B1857 Toyota (Short To Ground In Rear Side Squib Left Circuit)?

- Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the left side airbag deployment in the rear of the vehicle.

2. What are some possible causes of OBDII code B1857 Toyota?

- The code B1857 may be triggered by a short to ground in the rear side squib left circuit, which can be caused by damaged wiring, a faulty squib (airbag) module, or a poor electrical connection.

3. How can I diagnose the OBDII code B1857 Toyota?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connections related to the rear side squib left circuit, and testing the squib module for proper functionality.

4. Can I continue driving my vehicle with OBDII code B1857 Toyota present?

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

5. How can I repair OBDII code B1857 Toyota?

- Repairing the code may involve replacing damaged wiring, repairing electrical connections, or replacing the faulty rear side squib left module to resolve the short to ground issue.

6. Is it safe to attempt repairs for OBDII code B1857 Toyota on my own?

- While some basic inspections like checking connections can be done by DIY enthusiasts, working on the airbag system requires specific knowledge and precautions due to safety risks. It is recommended to seek professional help for such repairs.

7. How much does it typically cost to repair OBDII code B1857 Toyota?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts, labor, and diagnostic services. It is advisable to get estimates from reputable auto repair shops.

8. Can resetting the OBDII code B1857 Toyota resolve the issue temporarily?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying problem causing the short to ground in the rear side squib left circuit. It is crucial to address the root cause of the issue.

9. Are there any preventive measures to avoid OBDII code B1857 Toyota in the future?

- Regular maintenance checks, avoiding water damage to electrical components, and addressing any airbag warning lights promptly can help prevent issues like OBDII code B1857 from occurring.

10. How long does it take to repair OBDII code B1857 Toyota?

- The repair time can vary based on the complexity of the issue and the availability of parts. Simple fixes like reconnecting loose wires may take a short time, while replacing a squib module or extensive wiring repairs may take longer.