AutoCodes – Lexus – B1862 Lexus

B1862 Lexus Code - Short to Ground in Driver Side Knee Airbag Squib Circuit

Quick Answer

The Driver Side Knee Airbag Squib Circuit consists of the Center Airbag Sensor Assembly and the Driver Side Knee Airbag Assembly. Common causes include Faulty Driver Side Knee Airbag Assembly (Driver Side Knee Squib), Driver Side Knee Airbag Assembly harness is open or shorted, Driver Side Knee Airbag Assembly 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: B1862 Lexus indicates Short to Ground in Driver Side Knee Airbag Squib Circuit.
Common causes: Common causes include Faulty Driver Side Knee Airbag Assembly (Driver Side Knee Squib), Driver Side Knee Airbag Assembly harness is open or shorted, Driver Side Knee Airbag Assembly 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 1,543

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 Dec 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1862 Lexus Description

The Driver Side Knee Airbag Squib Circuit consists of the Center Airbag Sensor Assembly and the Driver Side Knee Airbag Assembly. 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 Driver Side Knee Airbag Squib Circuit.

OBDII Code B1862 Lexus - Short to Ground in Driver Side Knee Airbag Squib Circuit - AutoCodes.com — B1862 Lexus Code - Short to Ground in Driver Side Knee Airbag Squib Circuit

What does this mean?

What are the Possible Causes of the DTC B1862 Lexus?

Faulty Driver Side Knee Airbag Assembly (Driver Side Knee Squib)
Driver Side Knee Airbag Assembly harness is open or shorted
Driver Side Knee Airbag Assembly circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1862 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 B1862 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 B1862 Lexus code?

Need more information on how to fix the B1862 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1862 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 B1862 Lexus Code

1. What are the common symptoms of OBDII code B1862 in a Lexus related to the driver side knee airbag squib circuit short to ground?

The common symptoms include an illuminated airbag warning light on the dashboard, a non-functioning driver side knee airbag, and a diagnostic trouble code (DTC) B1862 stored in the vehicle's computer.

2. What are some possible causes of OBDII code B1862 indicating a short to ground in the driver side knee airbag squib circuit of a Lexus?

Possible causes include a damaged wiring harness, a faulty airbag squib or clock spring, a loose connection, or an internal fault in the airbag control module.

3. How can I diagnose the OBDII code B1862 in a Lexus related to a short to ground in the driver side knee airbag squib circuit?

Diagnosis typically involves using a scan tool to retrieve the specific trouble code, inspecting the wiring and connectors for damage, and testing the airbag squib and related components for proper functionality.

4. Is it safe to drive a Lexus with OBDII code B1862 indicating a short to ground in the driver side knee airbag squib circuit?

It is not recommended to drive the vehicle with this issue as the driver side knee airbag may not deploy in the event of a collision, potentially compromising occupant safety.

5. Can I repair OBDII code B1862 related to a short to ground in the driver side knee airbag squib circuit of my Lexus myself?

While some basic inspections and checks can be done by DIY enthusiasts, repairing this code often requires specialized tools and expertise due to the critical safety nature of airbag systems. It is recommended to seek professional help.

6. How much does it typically cost to repair OBDII code B1862 in a Lexus due to a short to ground in the driver side knee airbag squib circuit?

Repair costs can vary depending on the root cause of the issue, but it is advisable to budget for potentially significant expenses as airbag system repairs are crucial for vehicle safety.

7. Are there any precautions I should take when working on the driver side knee airbag squib circuit to resolve OBDII code B1862 in my Lexus?

It is essential to disconnect the vehicle's battery before working on any airbag components to prevent accidental deployment and follow proper safety procedures outlined in the vehicle's service manual.

8. Can resetting the OBDII code B1862 related to a short to ground in the driver side knee airbag squib circuit of a Lexus fix the issue?

Simply clearing the code without addressing the underlying problem will not resolve the issue. Proper diagnosis and repair of the root cause are necessary to ensure the airbag system functions correctly.

9. How long does it typically take to repair OBDII code B1862 indicating a short to ground in the driver side knee airbag squib circuit of a Lexus?

The repair time can vary depending on the exact cause of the issue and the availability of parts. Some repairs may be completed within a few hours, while others may take longer if extensive troubleshooting is required.

10. Can a faulty driver side knee airbag squib cause other related OBDII codes besides B1862 in a Lexus?

Yes, a faulty airbag squib can potentially trigger other related DTCs within the airbag system, so it is essential to address any detected issues promptly to ensure overall system functionality and safety.