AutoCodes – Lexus – B2090 Lexus

B2090 Lexus Code - Driving Support System Malfunction

Quick Answer

The Seat Belt Control ECU receives collision information from the Driving Support ECU and brake booster with master cylinder (skid control ECU) via CAN communication, and tightens the seat belt by operating the motor inside the front seat outer belt. Common causes include Faulty Seat Belt Control ECU, Seat Belt Control ECU harness is open or shorted, Seat Belt Control ECU 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: B2090 Lexus indicates Driving Support System Malfunction.
Common causes: Common causes include Faulty Seat Belt Control ECU, Seat Belt Control ECU harness is open or shorted, Seat Belt Control ECU 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 9,553

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 Sep 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2090 Lexus Description

The Seat Belt Control ECU receives collision information from the Driving Support ECU and brake booster with master cylinder (skid control ECU) via CAN communication, and tightens the seat belt by operating the motor inside the front seat outer belt. When the driving support ECU detects a malfunction in the dynamic radar cruise control system and pre-collision system, the malfunction information is sent to the seat belt control ECU, which outputs this Diagnostic Trouble Code (DTC). When DTC B2090 is detected, other DTCs are also stored by the driving support ECU (dynamic radar cruise control system and pre-collision system). Also, if the lane recognition camera sensor assembly beam axis adjustment is not performed after installing the lane recognition camera sensor assembly, DTC B2090 is stored.

OBDII Code B2090 Lexus - Driving Support System Malfunction - AutoCodes.com — B2090 Lexus Code - Driving Support System Malfunction

What does this mean?

What are the Possible Causes of the DTC B2090 Lexus?

Faulty Seat Belt Control ECU
Seat Belt Control ECU harness is open or shorted
Seat Belt Control ECU circuit poor electrical connection
Faulty Driving Support ECU

How to Fix the DTC B2090 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 B2090 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 B2090 Lexus code?

Need more information on how to fix the B2090 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2090 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 B2090 Lexus Code

1. What are the common symptoms of OBDII code B2090 in a Lexus related to the Driving Support System Malfunction?

Symptoms may include the malfunction indicator light (MIL) illuminating on the dashboard, loss of driving support system functionality, and potential performance issues.

2. What are some possible causes of the B2090 code in a Lexus?

The B2090 code in a Lexus can be triggered by issues such as a faulty driving support system sensor, wiring problems, software glitches, or a malfunctioning control module.

3. How can I diagnose the Driving Support System Malfunction related to code B2090 in my Lexus?

Diagnosis typically involves using an OBDII scanner to retrieve the specific fault codes, conducting a visual inspection of the driving support system components, and performing further testing to pinpoint the exact cause.

4. Is it safe to continue driving my Lexus with the B2090 code indicating a Driving Support System Malfunction?

It is generally not recommended to continue driving the vehicle with a B2090 code as it may affect the overall safety and performance of the driving support system. It's best to address the issue promptly.

5. Can I reset the B2090 code in my Lexus without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is crucial to address the root cause of the problem to prevent the code from reoccurring and ensure the proper functioning of the driving support system.

6. How much does it typically cost to repair the B2090 code related to the Driving Support System Malfunction in a Lexus?

Repair costs can vary depending on the specific cause of the issue, but it may involve replacing sensors, repairing wiring, updating software, or addressing control module issues. Costs can range from a few hundred to over a thousand dollars.

7. Can I fix the B2090 code issue in my Lexus myself, or do I need to take it to a professional mechanic?

While some DIY enthusiasts may attempt to diagnose and repair the issue themselves, dealing with complex electrical and sensor systems may require specialized knowledge and tools. It is often recommended to seek help from a professional mechanic.

8. Are there any preventative maintenance tips to avoid encountering the B2090 code in a Lexus?

Regularly inspecting and maintaining the driving support system components, following recommended service intervals, and addressing any warning signs promptly can help prevent issues leading to the B2090 code.

9. Will the B2090 code in my Lexus cause the vehicle to fail an emissions test?

Since the B2090 code is related to the Driving Support System Malfunction and not directly emissions-related, it may not cause the vehicle to fail an emissions test. However, it is essential to address the issue for overall vehicle performance and safety.

10. How long does it typically take to repair the B2090 code in a Lexus at a professional repair shop?

The repair time can vary based on the exact cause of the issue, availability of parts, and the shop's workload. Simple fixes may take a few hours, while more complex repairs could require a day or more to complete.