AutoCodes – Toyota – B1851 Toyota

B1851 Toyota Code - Open In Rear Side Squib Right Circuit

Quick Answer

The Rear Side Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Side Airbag Assembly Right (RH). Common causes include Faulty Rear Seat Side Airbag Assembly Right (RH) (Rear Side Squib Right Circuit), Rear Seat Side Airbag Assembly Right Left harness is open or shorted, Rear Seat Side Airbag Assembly Right 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: B1851 Toyota indicates Open In Rear Side Squib Right Circuit.
Common causes: Common causes include Faulty Rear Seat Side Airbag Assembly Right (RH) (Rear Side Squib Right Circuit), Rear Seat Side Airbag Assembly Right Left harness is open or shorted, Rear Seat Side Airbag Assembly Right 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 13,478

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 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1851 Toyota Description

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

OBDII Code B1851 Toyota - Open In Rear Side Squib Right Circuit - AutoCodes.com — B1851 Toyota Code - Open In Rear Side Squib Right Circuit

What does this mean?

What are the Possible Causes of the DTC B1851 Toyota?

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

How to Fix the DTC B1851 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 B1851 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 B1851 Toyota code?

Need more information on how to fix the B1851 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1851 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 B1851 Toyota Code

1. What are the common symptoms of OBDII code B1851 in a Toyota related to an Open In Rear Side Squib Right Circuit?

- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential non-deployment of the airbag in the event of a collision.

2. What can cause the Open In Rear Side Squib Right Circuit issue in a Toyota triggering OBDII code B1851?

- The issue is commonly caused by a faulty or disconnected wiring harness, damaged connectors, or a malfunctioning side airbag squib in the right rear seat.

3. How serious is the OBDII code B1851 related to an Open In Rear Side Squib Right Circuit in a Toyota?

- This issue is critical as it affects the proper functioning of the airbag system, compromising passenger safety in the event of a crash.

4. Is it safe to drive a Toyota with the OBDII code B1851 fault indicating an Open In Rear Side Squib Right Circuit?

- It is not recommended to drive the vehicle with this fault as the airbag system may not deploy as intended in case of an accident, increasing the risk of injury.

5. How can I diagnose and repair the Open In Rear Side Squib Right Circuit issue causing OBDII code B1851 in my Toyota?

- Proper diagnosis involves inspecting the wiring, connectors, and side airbag squib in the right rear seat for any damage or disconnection. Repair may involve repairing the wiring, replacing connectors, or replacing the faulty squib.

6. Can I reset the OBDII code B1851 related to an Open In Rear Side Squib Right Circuit in my Toyota without fixing the underlying issue?

- Resetting the code without addressing the root cause will not solve the problem, and the airbag system will remain compromised. It is essential to diagnose and repair the issue properly.

7. How can I prevent the recurrence of the OBDII code B1851 fault in my Toyota after fixing the Open In Rear Side Squib Right Circuit issue?

- Regularly inspecting the airbag system components, ensuring proper installation of connectors, and maintaining the wiring integrity can help prevent the issue from reoccurring.

8. Are there any safety precautions I should take when working on the Open In Rear Side Squib Right Circuit problem triggering OBDII code B1851 in my Toyota?

- Ensure the vehicle's battery is disconnected before working on the airbag system to prevent accidental deployment. It is also recommended to follow proper safety protocols and consult a professional if unsure.

9. Can a DIY enthusiast with some automotive knowledge fix the Open In Rear Side Squib Right Circuit issue causing OBDII code B1851 in a Toyota?

- While some DIY enthusiasts may have the skills to diagnose and repair wiring issues, working on the airbag system requires precision and caution. It is advisable to seek professional help to ensure proper repair and safety.

10. How long does it typically take to repair the Open In Rear Side Squib Right Circuit issue triggering OBDII code B1851 in a Toyota?

- The repair time can vary depending on the extent of the damage and the expertise of the technician. It may take a few hours to a day to diagnose and repair the issue properly.