AutoCodes – Lexus – B1820 Lexus

B1820 Lexus Code - Short 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: B1820 Lexus indicates Short 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 2,735

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 Nov 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1820 Lexus 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 B1820 Lexus - Short in Side Squib Right Circuit - AutoCodes.com — B1820 Lexus Code - Short in Side Squib Right Circuit

What does this mean?

What are the Possible Causes of the DTC B1820 Lexus?

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 B1820 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 B1820 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 B1820 Lexus code?

Need more information on how to fix the B1820 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1820 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 B1820 Lexus Code

1. What are the common symptoms of OBDII code B1820 in a Lexus related to a short in the Side Squib Right circuit?

- The common symptoms include the airbag warning light illuminating on the dashboard and potential non-deployment of the side airbag in the event of a collision.

2. What are the possible causes of the B1820 OBDII code indicating a short in the Side Squib Right circuit in a Lexus?

- The code can be triggered by issues such as damaged wiring, a faulty side airbag module, a defective airbag control module, or a blown fuse.

3. How can I diagnose the B1820 code in a Lexus pointing to a short in the Side Squib Right circuit?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring harness for any visible damage, and testing the components in the airbag system for proper functionality.

4. Can I continue driving my Lexus with the B1820 OBDII code indicating a short in the Side Squib Right circuit?

- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the airbag system, which may compromise passenger safety in the event of an accident.

5. How can I repair the B1820 OBDII code related to a short in the Side Squib Right circuit in my Lexus?

- Repairing this code involves addressing the specific cause, which may include repairing or replacing damaged wiring, replacing the side airbag module, or addressing any issues with the airbag control module.

6. Is it possible to reset the B1820 OBDII code in a Lexus after repairing the short in the Side Squib Right circuit?

- Yes, once the underlying issue has been fixed, the code can be cleared using an OBDII scanner to reset the system and turn off the warning light on the dashboard.

7. Are there any safety precautions to consider when working on the airbag system to resolve the B1820 code in a Lexus?

- It is crucial to disconnect the vehicle's battery and wait at least 10-15 minutes before working on the airbag system to prevent accidental deployment, which can cause injury.

8. Can a DIY enthusiast with automotive repair experience fix the B1820 OBDII code related to a short in the Side Squib Right circuit in a Lexus?

- While some basic troubleshooting steps can be performed by DIYers, working on the airbag system requires specialized knowledge and tools, so it's recommended to consult a professional for proper diagnosis and repair.

9. How long does it typically take to repair the B1820 OBDII code indicating a short in the Side Squib Right circuit in a Lexus?

- The repair time can vary depending on the specific cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem correctly.

10. Will fixing the B1820 OBDII code in a Lexus affect the vehicle's overall airbag system performance?

- Resolving the B1820 code should restore the proper function of the side airbag system, ensuring it operates correctly in the event of a collision and maintaining the overall safety of the vehicle.