AutoCodes – Toyota – B1821 2018 Toyota RAV4

B1821 2018 Toyota RAV4 Code - Open in Side Squib Right Circuit

Quick Answer

The Front Side Squib Right (RH) circuit consists of the Center Airbag Sensor Assembly and Front Seat Airbag Assembly Right (RH). Common causes include Faulty Front Seat Airbag Assembly Right (RH) (Front Side Squib Right), Front Seat Airbag Assembly Right harness is open or shorted, Front Seat Airbag 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: B1821 2018 Toyota RAV4 indicates Open in Side Squib Right Circuit.
Common causes: Common causes include Faulty Front Seat Airbag Assembly Right (RH) (Front Side Squib Right), Front Seat Airbag Assembly Right harness is open or shorted, Front Seat Airbag 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 483

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Nov 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1821 2018 Toyota RAV4 Description

The Front Side Squib Right (RH) circuit consists of the Center Airbag Sensor Assembly and Front Seat 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 front side squib RH circuit.

OBDII Code B1821 2018 Toyota RAV4 - Open in Side Squib Right Circuit - AutoCodes.com — B1821 2018 Toyota RAV4 Code - Open in Side Squib Right Circuit

What does this mean?

What are the Possible Causes of the DTC B1821 2018 Toyota RAV4?

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

How to Fix the DTC B1821 2018 Toyota RAV4?

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 B1821 2018 Toyota RAV4 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 B1821 2018 Toyota RAV4 code?

Need more information on how to fix the B1821 2018 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1821 2018 Toyota RAV4 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 B1821 2018 Toyota RAV4 Code

1. What are the common symptoms of OBDII code B1821 in a 2018 Toyota RAV4?

- Common symptoms include the airbag warning light illuminating on the dashboard and the supplemental restraint system being disabled.

2. What does the OBDII code B1821 "Open in Side Squib Right Circuit" mean for a 2018 Toyota RAV4?

- This code indicates an open circuit in the right side airbag squib, which is a component of the airbag system responsible for deploying the airbag in the event of a collision.

3. What are possible causes of the "Open in Side Squib Right Circuit" code in a 2018 Toyota RAV4?

- Common causes include a faulty side airbag squib, damaged wiring or connectors in the airbag system, or a problem with the airbag control module.

4. How can I diagnose the "Open in Side Squib Right Circuit" issue in my 2018 Toyota RAV4?

- Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the wiring and connectors for damage, and testing the side airbag squib for continuity.

5. Is it safe to drive my 2018 Toyota RAV4 with the B1821 fault code?

- It is not recommended to drive the vehicle with an active airbag fault code, as the airbag system may not deploy correctly in the event of a collision, jeopardizing occupant safety.

6. Can I reset the B1821 code in my 2018 Toyota RAV4 without fixing the underlying issue?

- While you can clear the fault code using a scan tool, it will likely reappear until the root cause of the problem, such as the open circuit in the side squib right circuit, is addressed.

7. What are the repair options for fixing the B1821 fault code in a 2018 Toyota RAV4?

- Repair options include replacing the faulty side airbag squib, repairing damaged wiring or connectors, or addressing any issues with the airbag control module.

8. How much does it cost to fix the "Open in Side Squib Right Circuit" fault in a 2018 Toyota RAV4?

- The cost of repairs can vary depending on the exact cause of the fault, but it may involve parts replacement and labor costs ranging from a few hundred to over a thousand dollars.

9. Can I fix the B1821 fault in my 2018 Toyota RAV4 myself, or should I seek professional help?

- Due to the safety implications of the airbag system, it is advisable to seek professional help from a qualified technician or mechanic to properly diagnose and repair the issue.

10. How can I prevent the recurrence of the B1821 fault in my 2018 Toyota RAV4 after it has been repaired?

- Regular maintenance and inspection of the airbag system, along with prompt attention to any warning lights or fault codes, can help prevent the recurrence of the B1821 fault in the future.