AutoCodes – Lexus – B1620 Lexus

B1620 Lexus Code - Side Airbag Sensor Right Circuit Malfunction

Quick Answer

The Side Collision Sensor Right (RH) circuit (to determine deployment of the Front Seat Side Airbag Assembly RH and Curtain Shield Airbag Assembly RH) is composed of the Center Airbag Sensor Assembly, Side Airbag Sensor RH and Rear Airbag Sensor RH. Common causes include Faulty Side Airbag Sensor Right (RH), Side Airbag Sensor Right (RH) harness is open or shorted, Side Airbag Sensor Right (RH) 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: B1620 Lexus indicates Side Airbag Sensor Right Circuit Malfunction.
Common causes: Common causes include Faulty Side Airbag Sensor Right (RH), Side Airbag Sensor Right (RH) harness is open or shorted, Side Airbag Sensor Right (RH) 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 1,354

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 May 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1620 Lexus Description

The Side Collision Sensor Right (RH) circuit (to determine deployment of the Front Seat Side Airbag Assembly RH and Curtain Shield Airbag Assembly RH) is composed of the Center Airbag Sensor Assembly, Side Airbag Sensor RH and Rear Airbag Sensor RH. The Side Airbag Sensor RH detect impacts to the vehicle and send signals to the Center Airbag Sensor Assembly to determine if the airbag should be deployed. The Diagnostic Trouble Code (DTC) B1620 is stored when a malfunction is detected in the Side Airbag Sensor RH.

OBDII Code B1620 Lexus - Side Airbag Sensor Right Circuit Malfunction - AutoCodes.com — B1620 Lexus Code - Side Airbag Sensor Right Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1620 Lexus?

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

How to Fix the DTC B1620 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 B1620 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 B1620 Lexus code?

Need more information on how to fix the B1620 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1620 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 B1620 Lexus Code

1. What are the common symptoms of OBDII code B1620 in a Lexus related to the Side Airbag Sensor Right Circuit Malfunction?

Symptoms may include the airbag warning light illuminating on the dashboard, potential non-deployment of the side airbag, and diagnostic trouble codes stored in the vehicle's computer.

2. What are some possible causes of the B1620 code indicating a Side Airbag Sensor Right Circuit Malfunction in a Lexus?

Potential causes can include a faulty side airbag sensor, wiring issues in the circuit, a disconnected or damaged sensor connector, or problems with the airbag control module.

3. How can I diagnose the Side Airbag Sensor Right Circuit Malfunction in my Lexus when the B1620 code is triggered?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the side airbag sensor and its wiring for damage, and testing the sensor's resistance and electrical connections.

4. Can driving with the B1620 code indicating a Side Airbag Sensor Right Circuit Malfunction in a Lexus be dangerous?

Driving with this code present can be risky as the side airbag may not deploy in the event of a side impact collision, potentially compromising occupant safety.

5. Is it possible to reset the B1620 code related to the Side Airbag Sensor Right Circuit Malfunction in a Lexus without performing any repairs?

Resetting the code without addressing the underlying issue is not recommended, as the problem will persist, and the airbag system may remain compromised.

6. Are there any DIY repair tips for fixing the Side Airbag Sensor Right Circuit Malfunction in a Lexus triggering the B1620 code?

DIY repair options are limited due to the critical nature of the airbag system. It is advisable to consult a professional technician or Lexus dealership for proper diagnosis and repair.

7. How much does it typically cost to repair the Side Airbag Sensor Right Circuit Malfunction triggering the B1620 code in a Lexus?

The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

8. Can a Lexus owner resolve the Side Airbag Sensor Right Circuit Malfunction issue causing the B1620 code by simply clearing the code with an OBDII scanner?

Clearing the code may temporarily eliminate the warning light, but it will not fix the underlying problem with the side airbag sensor circuit, which requires proper diagnosis and repair.

9. How important is it to address the Side Airbag Sensor Right Circuit Malfunction triggering the B1620 code promptly in a Lexus?

Prompt attention to this issue is crucial as it directly impacts the functionality of the side airbag system, affecting occupant protection in the event of a side collision.

10. Is it safe to continue driving a Lexus with the B1620 code indicating a Side Airbag Sensor Right Circuit Malfunction unresolved?

It is not advisable to drive the vehicle with this issue unaddressed, as the side airbag may not deploy as intended in a crash, potentially increasing the risk of injury to occupants.