AutoCodes – Generic – B2090

B2090 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 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 3,208

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 Sep 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2090 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 - Driving Support System Malfunction - AutoCodes.com — B2090 Code - Driving Support System Malfunction

What does this mean?

What are the Possible Causes of the DTC B2090?

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?

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 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 code?

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

Need Help with the Code?

Get the B2090 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2090 Acura — Right Power Slide Motor Malfunction
B2090 Honda — Right Power Slide Motor Malfunction
B2090 Lexus — Driving Support System Malfunction
B2090 Scion — Driving Support System Malfunction
B2090 Toyota — Driving Support System Malfunction

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 Code

1. What are common symptoms of OBDII code B2090 (Driving Support System Malfunction)?

- Common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, loss of driving support system functionalities, and potential error messages on the vehicle's display.

2. What typically causes the OBDII code B2090 to trigger?

- The code B2090 is usually triggered by a fault within the driving support system components, such as sensors, control modules, or wiring issues.

3. How serious is the Driving Support System Malfunction indicated by code B2090?

- The severity can vary, but it is generally recommended to address the issue promptly to ensure the proper functioning of driving support features and potentially prevent safety risks.

4. Can I continue driving my vehicle with the B2090 code present?

- It is generally not advisable to continue driving with the B2090 code present, as it may affect the performance of driving support systems and compromise safety.

5. How can I diagnose and repair the Driving Support System Malfunction related to code B2090?

- Diagnosis typically involves using a scan tool to retrieve the specific details of the fault. Repairs may involve inspecting and potentially replacing faulty components, checking wiring connections, or resetting the system.

6. Are there any common troubleshooting steps I can take for the B2090 code?

- Common troubleshooting steps include checking for loose or damaged wiring, ensuring proper sensor connections, and conducting a reset of the driving support system.

7. Is it possible to reset the B2090 code without professional equipment?

- Some basic OBDII code readers may have the capability to clear codes, but it is recommended to address the root cause of the issue to prevent the code from reoccurring.

8. Will fixing the B2090 code require a visit to a mechanic or dealership?

- Depending on your level of automotive knowledge and access to tools, you may be able to diagnose and repair the issue yourself. However, complex issues may require professional assistance.

9. Can extreme weather conditions trigger the B2090 code?

- Extreme weather conditions could potentially impact the driving support system components, leading to the triggering of the B2090 code. It is essential to ensure all components are properly sealed and protected.

10. How can I prevent the recurrence of the Driving Support System Malfunction indicated by code B2090?

- Regular maintenance checks, prompt addressing of any related issues, and ensuring proper care of driving support system components can help prevent the recurrence of the B2090 code.