AutoCodes – Lexus – B27A4 Lexus

B27A4 Lexus Code - Open in Passengers Side Rear Door Electrical Antenna Circuit

Quick Answer

The Certification ECU (Smart Key ECU Assembly) generates a request signal and transmits the signal to the Passengers Side Rear Door Outside Handle Assembly (electrical key antenna) at intervals of 0.25 seconds. Common causes include Faulty Passengers Side Rear Door Outside Handle Assembly, Passengers Side Rear Door Outside Handle Assembly harness is open or shorted, Passengers Side Rear Door Outside Handle 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: B27A4 Lexus indicates Open in Passengers Side Rear Door Electrical Antenna Circuit.
Common causes: Common causes include Faulty Passengers Side Rear Door Outside Handle Assembly, Passengers Side Rear Door Outside Handle Assembly harness is open or shorted, Passengers Side Rear Door Outside Handle 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 695

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 Jan 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B27A4 Lexus Description

The Certification ECU (Smart Key ECU Assembly) generates a request signal and transmits the signal to the Passengers Side Rear Door Outside Handle Assembly (electrical key antenna) at intervals of 0.25 seconds. For the Passengers Side Rear Door Outside Handle Assembly (electrical key antenna) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, a signal requesting a response from the electrical key transmitter sub-assembly is transmitted within approximately 1 m (3.28 ft.) of the rear door at intervals of 0.25 seconds. The Diagnostic Trouble Code (DTC) B27A3 is stored by the Certification ECU (Smart Key ECU Assembly) when an open circuit is detected between the Certification ECU (Smart Key ECU Assembly) and Passengers Side Rear Door Outside Handle Assembly (electrical key antenna).

OBDII Code B27A4 Lexus - Open in Passengers Side Rear Door Electrical Antenna Circuit - AutoCodes.com — B27A4 Lexus Code - Open in Passengers Side Rear Door Electrical Antenna Circuit

What does this mean?

What are the Possible Causes of the DTC B27A4 Lexus?

Faulty Passengers Side Rear Door Outside Handle Assembly
Passengers Side Rear Door Outside Handle Assembly harness is open or shorted
Passengers Side Rear Door Outside Handle Assembly circuit poor electrical connection
Faulty Certification ECU (Smart Key ECU Assembly)

How to Fix the DTC B27A4 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 B27A4 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 B27A4 Lexus code?

Need more information on how to fix the B27A4 Lexus code? Get Access to Factory Service Manuals

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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 B27A4 Lexus Code

1. What are common symptoms of an open in the passengers side rear door electrical antenna circuit (OBDII code B27A4) in a Lexus?

- Common symptoms include poor or loss of radio reception, issues with keyless entry system, and a warning light on the dashboard indicating an issue with the antenna circuit.

2. What are possible causes of the OBDII code B27A4 indicating an open in the passengers side rear door electrical antenna circuit in a Lexus?

- Possible causes include damaged wiring, loose connections, a faulty antenna amplifier, or a malfunctioning antenna itself.

3. How can I diagnose the open in the passengers side rear door electrical antenna circuit issue in my Lexus?

- To diagnose the issue, you can visually inspect the wiring and connections in the rear door, test the antenna for continuity, and use a diagnostic scanner to retrieve the specific fault code.

4. What are some repair tips for fixing the open in the passengers side rear door electrical antenna circuit in a Lexus?

- Repair tips include checking and repairing any damaged wiring or connectors, replacing the antenna amplifier if necessary, and ensuring proper grounding for the antenna system.

5. Can I drive my Lexus with the OBDII code B27A4 indicating an open in the passengers side rear door electrical antenna circuit?

- It is generally safe to drive the vehicle with this code, but you may experience issues with the radio reception and keyless entry system until the problem is resolved.

6. How much does it typically cost to repair the open in the passengers side rear door electrical antenna circuit in a Lexus?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Is it possible to reset the OBDII code B27A4 in a Lexus without repairing the issue?

- While you can clear the code using a diagnostic scanner, it is not recommended to do so without addressing the underlying problem, as it may lead to ongoing issues with the antenna circuit.

8. Can a DIY enthusiast fix the open in the passengers side rear door electrical antenna circuit issue in a Lexus?

- Depending on your skill level and access to tools, you may be able to tackle this repair yourself by following a repair manual or online guides. However, professional help is often recommended for complex electrical issues.