AutoCodes – Lexus – B2504 Lexus

B2504 Lexus Code - Open In Roof Drive Motor Left Circuit

Quick Answer

With the roof control switch being pressed, the Sliding Roof Control ECU operates the roof panel, luggage door and package tray (in that order). Common causes include Faulty Roof Drive Motor Left, Roof Drive Motor Left harness is open or shorted, Roof Drive Motor Left 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: B2504 Lexus indicates Open In Roof Drive Motor Left Circuit.
Common causes: Common causes include Faulty Roof Drive Motor Left, Roof Drive Motor Left harness is open or shorted, Roof Drive Motor Left 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 1,393

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 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2504 Lexus Description

With the roof control switch being pressed, the Sliding Roof Control ECU operates the roof panel, luggage door and package tray (in that order). The ECU operates the roof panel while adjusting the speed of the left and right motors.

OBDII Code B2504 Lexus - Open In Roof Drive Motor Left Circuit - AutoCodes.com — B2504 Lexus Code - Open In Roof Drive Motor Left Circuit

What does this mean?

What are the Possible Causes of the DTC B2504 Lexus?

Faulty Roof Drive Motor Left
Roof Drive Motor Left harness is open or shorted
Roof Drive Motor Left circuit poor electrical connection
Faulty Sliding Roof Control ECU

How to Fix the DTC B2504 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 B2504 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 B2504 Lexus code?

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Need Help with the Code?

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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 B2504 Lexus Code

1. What are the common symptoms of OBDII code B2504 in a Lexus, indicating an open in the roof drive motor left circuit?

- Common symptoms include the roof not opening or closing properly, unusual noises coming from the roof area, and a warning light on the dashboard.

2. What can cause the OBDII code B2504 "Open In Roof Drive Motor Left Circuit" in a Lexus?

- The code can be triggered by a damaged or disconnected wiring harness, a faulty roof drive motor, or a malfunctioning control module.

3. How can I diagnose the cause of OBDII code B2504 in my Lexus related to an open in the roof drive motor left circuit?

- A thorough visual inspection of the wiring harness, connectors, and roof drive motor is recommended. Using a multimeter to test for continuity and voltage can help pinpoint the issue.

4. Can I still operate the roof manually if I encounter the B2504 code on my Lexus?

- Depending on the specific model, there may be a manual override procedure outlined in the owner's manual that allows you to manually operate the roof in case of electrical issues.

5. Is it safe to drive my Lexus with the B2504 code present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent further damage to the roof drive motor or related components.

6. How much does it typically cost to repair the open in roof drive motor left circuit issue causing the B2504 code in a Lexus?

- The cost of repair can vary depending on the root cause of the problem, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can I reset the OBDII code B2504 in my Lexus after fixing the issue with the roof drive motor left circuit?

- Yes, once the underlying problem is fixed, the code can be cleared using an OBDII scanner or by disconnecting the car battery for a few minutes.

8. Are there any preventive maintenance tips to avoid encountering the B2504 code in my Lexus in the future?

- Regularly inspecting the condition of the roof components, keeping the wiring harness secure, and addressing any issues promptly can help prevent the recurrence of this code.

9. Will the B2504 code affect the overall performance of my Lexus, aside from the roof operation?

- In most cases, the B2504 code is specific to the roof drive motor left circuit and should not impact the overall performance of the vehicle or its drivability.

10. Can a DIY enthusiast with automotive knowledge repair the open in roof drive motor left circuit issue causing the B2504 code in a Lexus?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this issue, but it is recommended to consult a professional technician for complex electrical repairs.